The thickness of the clay layer under a layer of sand is equal to 5 m. The ground surface is subjected to a uniformly distributed load of 40 kPa and resulted to a primary consolidation settlement of 180 mm. Determine the secondary settlement (mm) of the clay layer 5 years after the completion of the primary consolidation settlement. Time of completion of primary settlement is 1.5 yrs. Secondary compression index Cα = 0.02 and void ratio of 0.54.

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Answer 1

Given data:The thickness of clay layer (hc) = 5mUniformly distributed load (σ) = 40kPaPrimary consolidation settlement (s) = 180mmTime of completion of primary settlement (tp) = 1.5 yrs Time period after completion of primary settlement (t) = 5 - 1.5 = 3.5 yrs Secondary compression index (Cα) = 0.02Void ratio (e) = 0.54To find:

Secondary settlement (ss)Formula used:Total settlement, s = primary consolidation settlement + secondary settlement ⇒ s = sP + ssThe secondary settlement, ss = Cασlog10(t+tp)log10(tp)The void ratio (e) is given by e = Vv/Vs = (V – Vw)/(Vg – Vw)Where, V = volume of soilVw = volume of waterVg = volume of air and water.

Vs = volume of solidVv = volume of voidsV = Vs + VvSo, Vs = V/(1+e) and Vv = V × e/(1+e)Calculations: As given, total thickness of the soil (h) = hc + hsTo calculate hs, use the formula of Bousiness q. Bousiness q equation is used to calculate the settlement of soil when it is subjected to the loads, and the thickness of the soil layer is very large relative to the footing size and the soil layer is assumed to be homogeneous and isotropic.

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Related Questions

2.50m x 2.50m square footing supports a 350mm x 400mm reinforced concrete column carrying a factored axial load of 930 kN. Use fc = 28 MPa and fy = 415 MPa. Use 20mm diameter reinforcing steel bars bothways. Clear concrete cover is 70 mm
A. Determine the effective depth of footing for wide-beam action
B. Determine the effective depth of footing based on two way action.
C. Determine the required safe thickness of footing.

Answers

a) To find the effective depth of the footing, use the formula for wide-beam action:

be =[tex][bc + {(12AsFy) / (0.85fc(b - d))}] / 2[/tex],where:bc = width of the columnAs = area of steel reinforcement in the footing

Fy = steel yield strengthfc = compressive strength of the concreteb = width of the footingd = effective depth of the footing

Substituting the values given,be =[tex][0.4 + {(12 x 0.031416 x 415) / (0.85 x 28 x (2.5 - 0.07))}] / 2= 0.844 m[/tex]Therefore, the effective depth of the footing for wide-beam action is 0.844 m.

b) To find the effective depth of the footing based on two-way action, use the formula:deff = [tex]0.75{[Asfy + (bt)^2/2]}^(1/2) / (0.85fc)[/tex]bwhere:t = thickness of the footing

Substituting the values given and solving for deff,deff =[tex]0.75{[0.031416 x 415 + (2.5 x 0.35)^2/2]}^(1/2) / (0.85 x 28 x 2.5)= 0.60 m[/tex]

The effective depth of the footing based on two-way action is 0.60 m.c) The required safe thickness of the footing can be calculated as follows:V = factored axial load on the column = 930 kN, or 930,000

[tex]Nq = 1 - V/[4(b + t)fc][/tex ]where:q = non-dimensional bearing capacity factorb = width of the footing d = effective depth of the footingt = thickness of the footing for a footing width of 2.5 m and a value of q = 0.15, the minimum thickness of the footing required for safe bearing capacity is 0.35 m.

the required safe thickness of the footing is 0.35 m.

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A rectangular reinforced concrete beam will be designed under the effect of 100 KN - m bending moment . Materials : C18 - S220 , Cover : 30 mm , Not Earthquake Zone .

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In reinforced concrete beams, the tensile strength of the material is increased by incorporating steel bars or wire mesh, whereas the compressive strength is increased by adding concrete. As a result, reinforced concrete beams can withstand high stresses without cracking or breaking, making them an excellent structural material for bridges.

buildings, and other infrastructure. When designing a rectangular reinforced concrete beam, it is critical to consider the materials and loading conditions. Given the beam's material, C18-S220, and the cover, 30 mm, we can determine the required dimensions for the beam using established design codes.

To begin, we must determine the required depth of the beam, which can be found using the formula d = M / (0.87f_yb) (where M is the bending moment, f_y is the yield strength of the reinforcement, and b is the width of the beam).
For the given values of M (100 KN-m), f_y (220 MPa), and b (unknown), we can rearrange the formula to solve for b:

b = M / (0.87f_yd)

b = 100 KN-m / (0.87 x 220 MPa x d)

Since the beam is rectangular, the depth is equal to the height of the beam. As a result, we can calculate the required height of the beam (d) for a given width (b). Once we have calculated the depth, we can calculate the required area of steel reinforcement (A_s) using the formula A_s = M / (0.87f_yjd).

In conclusion, the design of a rectangular reinforced concrete beam involves a series of calculations to determine the required dimensions, reinforcement, and other design factors. These calculations are based on the materials, loading conditions, and design codes specified for the project.

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Determine the maximum load that can be applied on the beam shown in figure if the stresses in the material of the beam section is limited to the following:-
Allowable bending stress in not to exceed 25 MPa Allowable shear stress is not to exceed 10 MPa.

Answers

Given: Allowable bending stress σ_b = 25 MPa; Allowable shear stress σ_s = 10 MPa.The maximum load that can be applied to the beam shown in the figure can be determined by using the concept of maximum bending moment and maximum shear force acting on the beam.

Let the maximum load be W N. Consider a section XX' which cuts the beam at a distance x from the left end. The bending moment M at section XX' is given byM = Wx Nm (clockwise)The bending stress σ_b at section XX' is given byσ_b = My/I_bwhere y is the distance of the point from the neutral axis of the beam, I_b is the moment of inertia of the beam section about the neutral axisσ_

b = (Wx)(h/2)/[(b)(h^3/12)]where b and h are the width and height of the beam section respectively. The maximum value of σ_b is 25 MPaσ_b(max) = 25 M   Pa∴ (Wx)(h/2)/[(b)(h^3/12)] = 25 M Pa On simplifying the above equation, we get W/b = 0.00267hOn substituting b = 200 mm and h = 400 mm, we get

W/200 = 0.00267 × 400W = 0.00267 × 400 × 200W = 214.08 N The maximum load that can be applied on the beam is 214.08 N. The maximum shear force V in the beam is given by V = W N The maximum value of σ_s is 10 MPaσ_s = V/A where A is the area of the beam sectionσ_s = W/(b × t).

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Determine the volume (m3 ) of three identical activated-sludge tanks following primary clarification to aerate 38,000 m3 /d with a BOD concentration of 170 mg/l at a BOD loading of 550 g/m3 •d. What is the aeration time (hr)? For a F/M of 0.35, what MLSS concentration (mg/L) should be maintained in the aeration tanks? Estimate the operating sludge age (days), assuming an effluent suspended solid of 30 mg/l and a daily amount of waste-activated sludge solids of 950 kg/d.

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Activated sludge is a biological process used to remove organic matter from wastewater. In order to determine the volume of three identical activated-sludge tanks following primary clarification to aerate 38,000 m3 /d with a BOD concentration of 170 mg/l at a BOD loading of 550 g/m3

[tex]Q = AL[/tex], where:Q = Flow rate (m3/d)A = Surface area (m2)L = Liquid depth (m)First, calculate the volumetric BOD loading [tex](lb/ft3•d): 550g/m3•d ÷ 1,000 = 0.550 kg/m3•d0.550 kg/m3•d x 2.2046 = 1.213 lb/m3[/tex]

Next, calculate the total required volume (m3):

[tex]38,000 m3/d ÷ 1.213 lb/m3•d = 31,318 m3[/tex]

Therefore, each of the three identical activated-sludge tanks should have a volume of approximately 10,439 m3

Operating sludge age = [tex](MLSS, kg/m3 x 0.0624 lb/ft3)[/tex]÷ [tex](950 kg/d x 2.2046 lb/kg x 1,440 min/d x 60 min/h ÷ 7.4805 gal/ft3) = 9.75 days[/tex] (rounded to two decimal places).

Therefore, the required volume is 10,439 m3 per activated-sludge tank. The aeration time is unknown, and the organic load in the influent in terms of BOD is 13,613 lb/day.

The MLSS concentration that should be maintained in the aeration tanks is 2,683 mg/L. Lastly, the operating sludge age is 9.75 days.

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Sandstone an unconfined aquifer, the top of the zone of saturation is called the a) Pressure surface. ) Water table () Saturation limit. d) Water level 12. When fine-grained sediments at bottom of shallow water are exposed() air, they dry out to form structures known as Ripple cracks b) Water marks c) Ripple marks d) Mud cracks

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Sandstone is an unconfined aquifer. The top of the zone of saturation is called the water table. When fine-grained sediments at the bottom of shallow water are exposed to air, they dry out to form structures known as mud cracks

When the soil is saturated with water, the water table rises. An unconfined aquifer is one in which the water table is free to fluctuate in response to changes in the volume of water stored in the aquifer. Sandstone is an example of an unconfined aquifer, which is porous and permeable, meaning that water can move through it quite easily.

The top of the zone of saturation in an unconfined aquifer is called the water table. Ripple marks are features that form in fine-grained sedimentary rocks like sandstone. When these sediments are deposited under shallow water, they are often subjected to wave action, causing the sediment to ripple.

These ripples are preserved in the rock when it solidifies. Mud cracks are a different type of feature that forms when fine-grained sediments at the bottom of shallow water are exposed to air.

As the sediment dries out, it shrinks and cracks, forming a pattern of interconnected cracks that resemble a dried-up mud puddle.

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Which of the following options is the correct value of the force required for punching a circular blank of 40 mm diameter in a plate of 5 mm thick? Consider that the ultimate shear stress of the plate in 340 N/ww
373.4N
230.8KN
348.5AN
213.7AN

Answers

The correct value of the force required for punching a circular blank of 40 mm diameter in a plate of 5 mm thick is [tex]213.7[/tex]kN. can be calculated as follows:

Diameter of the circular blank = 40 mm

Thickness of the plate = 5 mm

Ultimate shear stress of the plate = 340 N/mm²

The area of the circular blank will be calculated as follows:[tex]Area = π/4 × d²[/tex]

Where d is the diameter of the circular blank Area = π/4 × (40 mm)²Area = 1256.64 mm²

The force required to punch the circular blank will be calculated as follows:

Shear force = Area × Shear stress Shear force =[tex]1256.64 mm² × 340 N/mm²[/tex]Shear force = [tex]427644.16[/tex]N

Converting N to kN, we have;Shear force = 427.64416 kN

Therefore, the correct value of the force required for punching a circular blank of 40 mm diameter in a plate of 5 mm thick is 427.64416 kN.

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a.) What are the predictable risks that could be mitigated with forward planning of a project?
b.) Indicate the flow chart of Risk management and building information modelling for international construction.

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What are the predictable risks that could be mitigated with forward planning of a project? Projects are subject to different risks that can cause delays, affect quality and, consequently, lead to an increase in costs.

As such, it is crucial to plan for risks and manage them throughout the project life cycle. Below are some of the predictable risks that can be mitigated with forward planning of a project:

Financial risks: A project's budget and cash flow are critical components that should be considered during planning. Financial risks that could be mitigated include cost escalation, foreign exchange rates, cash flow shortfalls, among others.

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A concrete masonry unit is tested for compressive strength and produces the following results: Failure load = 726 KN Gross area = 0.081 m² Gross volume = 0.015 m Net volume = 0.007 m? Is the unit categorized as solid or hollow? Why? What is the compressive strength? Does the compressive strength satisfy the ASTM requirements for load bearing units shown in Table 8.2?

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The concrete masonry unit is categorized as solid or hollow based on its net volume and gross volume. If the net volume is less than 25% of the gross volume, then the unit is categorized as solid.  

According to the given data, the gross volume of the concrete masonry unit is 0.015 m³, and its net volume is 0.007 m³. Therefore, the net volume of the unit is less than 25% of its gross volume. Thus, it is categorized as a solid unit.  

Compressive strength = Failure load / Gross area = 726 KN / 0.081 m² = 8963.27 kPa The compressive strength of the unit is 8963.27 kPa. The ASTM C90 standard specifies that a solid concrete masonry unit must have a minimum compressive strength of 1900 psi (13103.5 kPa).

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13. Which treatment below can be used to reduce the differential settlement of shallow foundation?
A. adopting box foundation;
B. arranging pile foundation;
C. decreasing the stiffness of the foundation;
D. adopting unreinforced spread foundation
14. For which kind of soil below, ground settlement could take long term to complete?
A. cohesive clay;
B. granite rock;
C. sandy soil;
D. limestone rock
15. Which equation below can be used to determine the deflection of pile top based on the deflection of the pile cap?
A. physical equations;
C. continuity equations;
B. constitutive equations;
D. force equilibrium equations

Answers

A shallow foundation is a kind of foundation that transfers the structure's load to the earth's surface only a short distance beneath the structure's base. In comparison to deep foundations, shallow foundations are more cost-effective and simpler to construct..

Ground settlement could take a long time to complete for cohesive clay. When it comes to soil types, cohesive soils, such as clay, have a higher tendency to experience long-term settlement. This is due to the fact that cohesive soils take a long time to settle because they are stiff.

The equation that can be used to determine the deflection of pile top based on the deflection of the pile cap is continuity equations. The deflection of the pile top can be determined using the continuity equation that links the deflection of the pile cap to the deflection of the pile top. Because the pile cap is used to distribute the load to the underlying piles, it deflects.

The continuity equation is used to determine the deflection of the pile top, which is the load-carrying element. The continuity equation states that the slope of the pile cap and the deflection of the pile top are proportional. Therefore, pile top deflection may be determined by multiplying the pile cap slope by a fixed number.

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Zistine Building Co. considers a one-year project in New Zealand so that it can capitalise on construction technology. It is risk-averse, but is attracted to the project because of a government guarantee. The project will generate a guaranteed NZ$8 million in revenue, paid by the New Zealand government at the end of the year. The payment by the New Zealand government is also guaranteed by a credible U.S. bank. The cash flows earned on the project will be converted to U.S. dollars and remitted to the parent in one year. The prevailing nominal one-year interest rate in New Zealand is 5% while the nominal one- year interest rate in the U.S. is 9%. Zistine's Chief Executive Officer believes that the movement in the New Zealand dollar is highly uncertain over the next year, but his best guess is that the change in its value will be in accordance with the International Fisher Effect (IFE). He also believes that interest rate parity holds. He provides this information to three recent finance graduates that he just hired as project managers and asks them for their input. The following are their input:
The first manager states that due to the parity conditions, the feasibility of the project will be the same whether the cash flows are hedged with a forward contract or are not hedged.
The second manager states that the project should not be hedged. Based on the interest rates, the IFE suggests that Zistine Building Co. will benefit from the future exchange rate movements, so the project will generate a higher Net Present Value (NPV) if Zistine does not hedge.
The third manager states that the project should be hedged because the forward rate contains a premium, and therefore the forward rate will generate more U.S. dollar cash flows than the expected amount of dollar cash flows if the firm remains unhedged.
(a) Analyse the proper action for all the inputs given by three project managers.
(b) Propose the best action that the project manager can choose.

Answers

(a) Analyse the proper action for all the inputs given by three project managers: In the context of the situation described above, there are three project managers, each with a different idea of  the proper course of action.

The first manager's position is that the project's feasibility will remain unchanged whether the cash flows are hedged with a forward contract or not.

The second manager argues that the project should not be hedged due to the IFE, which suggests that the firm will profit from future exchange rate movements if they do not hedge. Because of the interest rates, the IFE will result in a higher Net Present Value (NPV) for the project.

The third manager believes that the project should be hedged because the forward rate contains a premium that will result in more U.S. dollar cash flows than if the firm remains unhedged. Therefore, this manager recommends that the firm hedge their currency risk in this situation.

(b) Propose the best action that the project manager can choose: Because the government guarantee is backed by a credible U.S. bank, the firm is exposed to currency risk. While the IFE suggests that exchange rate changes will benefit Zistine Building Co., this is only true in the absence of risk.

The possibility of losses resulting from exchange rate fluctuations is still present. Therefore, the most appropriate action in this situation is to follow the third manager's suggestion and hedge the currency risk associated with the project.

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Explain the importance of a customer to ensure a successful business logistics function. 1.2 With the aid of examples, discuss the pre-transaction-related activities of customer service.

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Customers are vital for the success of business logistics, as they drive demand and provide feedback. Pre-transaction customer service activities include product consultation, order processing, and complaint resolution.

Customer satisfaction is crucial for the success of any business logistics function. Customers play a vital role in driving demand, providing valuable feedback, and establishing long-term relationships. By focusing on customer needs and expectations, businesses can optimize their logistics operations to deliver products efficiently and effectively.

Effective pre-transaction-related activities of customer service are essential for building strong customer relationships. These activities involve engaging with customers before the actual transaction takes place, ensuring their needs are understood, and addressing any concerns or inquiries they may have. Examples of pre-transaction customer service activities include:

1. Product Information and Consultation: Providing detailed information about products or services, explaining their features and benefits, and offering recommendations based on customer requirements. For instance, a customer service representative might assist a customer in selecting the right size and specifications for a product they intend to purchase.

2. Order Processing and Tracking: Assisting customers in placing orders, confirming order details, and providing updates on the order status. This can involve addressing any issues related to inventory availability, payment processing, or delivery scheduling. For example, a customer service team may help a customer track their package and provide real-time updates on its location and estimated delivery time.

3. Handling Inquiries and Resolving Complaints: Promptly addressing customer inquiries, concerns, or complaints to ensure a satisfactory resolution. This can involve troubleshooting technical issues, facilitating returns or exchanges, or offering compensation for any service failures. For instance, a customer service representative may assist a customer who received a damaged product and promptly arrange for a replacement or refund.

By engaging in these pre-transaction-related customer service activities, businesses can establish trust, enhance the customer experience, and increase the likelihood of repeat purchases and positive word-of-mouth. It sets the stage for a successful transaction and lays the foundation for a long-term customer-business relationship.

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(a) Explain the applications of low strain and high strain dynamic pile load tests. (b) A 0.8 m diameter concrete pile is driven at a site as shown in Figure below, where the water table is at the ground surface. The pile's design uplift load is 800 kN. Assume No is 35 for the sand layer. Pile-soil interaction factor a in clay is 0.6. Pile-soil interface friction angle in sand is 75% of the friction angle of sand.
(i) Determine the pile's required length to support the uplift load if the factor of safety is 2.5. Note: Round pile length to the nearest 0.5 m.
(ii) Check whether the calculated pile length is sufficient to carry an axial load of 2 MN with a factor of safety of 3.0. (iii) If 10 piles are used with a pile cap as a group, calculate the axial load carrying capacity of the pile group. The centre to centre spacing between piles in the group is 1.0 m.

Answers

This is frequently used in conjunction with static pile load testing for a more complete picture of pile capacity and performance.

Friction capacity of sand pile =[tex]35 x π/4 x (0.8)2 x (140 - 0) / (2 x 2.5) = 479.67 kN[/tex]

Net ultimate bearing capacity = [tex]479.67 + 45.83 = 525.5 kN[/tex]

Required pile length =[tex]{[(800 + 0)/525.5] + 0} / (2.5 x 0.6 x π/4 x (0.82))= 15.45 m ≈ 15.5 m[/tex]

(ii) Check whether the calculated pile length is sufficient to carry an axial load of 2 MN with a factor of safety of 3.0

Ultimate capacity of pile = Net ultimate bearing capacity + side resistance capacity= [tex]525.5 + (0.6 x π/4 x (0.8)2 x 27.5 x 1000) = 707.9 kN[/tex]

Ultimate capacity of 10 piles = [tex]707.9 kN x 10 = 7079 kN[/tex]

FOS for axial load =[tex]7079 / 2000 x 3 = 10.6 > 3.0,[/tex]

Therefore, the pile length is sufficient.

(iii) Axial load carrying capacity of pile group= (No of piles x Ultimate capacity of single pile x Reduction factor)/FOSEquivalent diameter, Deq =[tex](N x Ap)1/2 = (10 x π/4 x 0.82)1/2 = 3.52 m[/tex]

Reduction factor, [tex]Rf = (1 – 0.3/Deq) x (1 – 0.3/Hf) = 0.763 x 0.8 = 0.61[/tex]

Axial load carrying capacity of pile group = [tex](10 x 707.9 x 0.61) / 2.5= 10960.84 kN = 10.96 MN[/tex]

Therefore, the axial load carrying capacity of the pile group is 10.96 MN.

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Given an initialized String variable message , and given a PrintWriter reference variable named output that references a PrintWriter object , write a statement that writes the string referenced by message to the file output streams to.
Given an initialized String variable message , and given a PrintWriter reference variable named output that references a PrintWriter object , write a statement that writes the string referenced by message to the file output streams to.

Answers

To write the string referenced by the variable message to the file output streams using a PrintWriter object referenced by output, you can use the println method.To write the string to the file output streams, you need to call the println method of the PrintWriter object.

The println method writes a string to the output stream and appends a line separator to it. Here's an example statement that accomplishes this:

output.println(message);

This statement calls the println method on the output object and passes the message string as an argument. The println method writes the string followed by a line separator to the output streams associated with the PrintWriter object. If you want to write the string without appending a line separator, you can use the print method instead:

output.print(message);

Both println and print methods allow you to write the string referenced by message to the file output streams using the PrintWriter object output.

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CLO For beam design, the lateral torsional bucking modification factor tC for asted beam fed at both ends with uniformay dributed load is 2.38 Lateral bracing is provided at supports (fed ends)

Answers

In the case of lateral torsional buckling, CLO, or the modification factor, must be included in the design of a beam. The modification factor for lateral torsional buckling of a castellated beam with simply supported edges is expressed as tC, which is equal to 2.38.

Lateral bracing is supplied at the supports (fed ends).When a beam is loaded and subjected to lateral torsional buckling, the lateral torsional buckling coefficient (CLO) becomes significant. The lateral torsional buckling factor is a ratio of the critical moment of buckling to the elastic moment of the beam.

The greater the lateral torsional buckling coefficient (CLO), the greater the critical moment for buckling and the higher the beam's buckling resistance. If the lateral torsional buckling coefficient (CLO) is greater than or equal to 1, the beam is classified as torsionally rigid and doesn't require additional lateral bracing.

Lateral bracing must be given at the supports (fed ends) for asted beam fed at both ends with uniformay dributed load. Therefore, the lateral torsional buckling coefficient (CLO) for asted beam fed at both ends with uniformay dributed load is equal to 2.38. The beam's buckling strength can be increased by using the lateral torsional buckling factor (CLO).

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Which of the following is not part of the building schedule for a project a) The planning stage b) The scheduling stage c) The controlling stage d) The sequencing stage

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A project is a temporary endeavour that is designed to produce a unique product, service, or outcome. The project manager's goal is to deliver the project on time, within budget, and in accordance with the quality standards specified by the project stakeholders. The building schedule is an essential component of project management.

It is a plan that outlines the sequence of activities that must be completed to achieve the project objectives. The building schedule also identifies the resources required to complete each activity and the time required to complete each activity. The building schedule is typically divided into four stages, as follows:

1. The Planning Stage: This stage involves defining the project objectives and determining the scope of the project. During this stage, the project manager identifies the stakeholders, develops a project charter, and defines the project requirements.

2. The Sequencing Stage: This stage involves identifying the activities that need to be completed to achieve the project objectives.

3. The Scheduling Stage: This stage involves assigning resources to each activity and estimating the time required to complete each activity.

4. The Controlling Stage: This stage involves monitoring the project's progress against the schedule and making adjustments as necessary.

The project manager also monitors the project's budget and quality to ensure that they are within the specified limits. Answer: d) The sequencing stage is not part of the building schedule for a project.

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Design a non-cylinder prestressed concrete pipe of 600 mm internal diameter to withstand a working hydrostatic pressure of 1.05 N/mm 2 , using a 2.5 mm high-tensile wire stressed to 1000 N/mm 2 at transfer. Permissible maximum and minimum stresses in concrete at transfer and service loads are 14 and 0.7 N/mm 2 . The loss ratio is 0.8. Calculate also the test pressure required to produce a tensile stress of 0.7 N/mm 2 in concrete when applied immediately after tensioning and also the winding stress in steel if E s ​ =210kN/mm 2 and E c ​ =35kN/mm 2 .

Answers

To design a non-cylinder prestressed concrete pipe with a 600 mm internal diameter to withstand a working hydrostatic pressure of 1.05 N/mm², the ultimate tensile stress developed in the wire is calculated as 1250 N/mm². The stress in the wire at transfer and service loads is determined based on the assumptions of Pp/P = x and Ps/P = y. The design includes calculating the thickness of the pipe and ensuring that the load capacity exceeds the applied load. The winding stress in steel is determined to be 7500 N/mm². The test pressure required to achieve a tensile stress of 0.7 N/mm² in concrete is also calculated. Overall, the design meets the requirements for the given working hydrostatic pressure.

Given:

Internal diameter (D) = 600 mm

Working Hydrostatic pressure (p) = 1.05 N/mm²

Prestressing wire stress (fp) = 1000 N/mm² at transfer

Concrete permissible stress at transfer (fc) = 14 N/mm²

Concrete permissible stress at service load (fcd) = 0.7 N/mm²

Loss ratio (α) = 0.8

Modulus of Elasticity of steel (Es) = 210 kN/mm²

Modulus of Elasticity of concrete (Ec) = 35 kN/mm²

To design a non-cylinder prestressed concrete pipe with a 600 mm internal diameter to withstand a working hydrostatic pressure of 1.05 N/mm², we need to determine the ultimate tensile stress developed in the wire. The formula for ultimate tensile stress is given as:

σpu = fp / α = 1000 / 0.8 = 1250 N/mm²

Thus, the ultimate tensile stress developed in the wire (σpu) is 1250 N/mm².

Next, we calculate the stress in the wire at transfer (σp) using the formula:

σp = σpu × Pp / P = 1250 × Pp / P

Assuming Pp / P = x, we have:

σp = 1250 × x ............. (1)

The initial stress in the wire at transfer is given as 1000 N/mm².

The stress loss in the wire at service is calculated as:

fpe = fp - σpu = 1000 - 1250 = -250 N/mm²

The stress in the wire at service (σps) is given by:

σps = fpe × Ps / P = -250 × Ps / P

Assuming Ps / P = y, we have:

σps = -250 × y ............. (2)

At service load, the stress in the wire should be equal to fcd, so we have:

σps = fcd / -250

y = P / 625000 fcd ............. (3)

We also know that:

Pp + Ps = Pu = P × α

Pp + Ps = P / 0.8

Pp + Ps = 1.25P

Assuming Pp / P = x and Ps / P = y, we have:

x + y = 1.25 ............. (4)

From equations (1) and (2), we get:

1250 × x - 250 × y = σp - σps

= σp + fcd / 625000 × P ............. (5)

To calculate the thickness (t) of the pipe, we assume a value and then use it to calculate the area of the cross-section (A) of the pipe. The load capacity of the pipe should be greater than the load acting on it.

A = π/4 (D² - (D - 2t)²)

The load acting on the pipe is given as:

P = 1.05 × A = 1.05 × π/4 (600² - (600 - 2t)²) = 1647.88t² N

By substituting the value of P in equation (5) and solving for x and y, we can calculate the stresses in the wire at transfer and service loads.

From the given data, we can calculate the winding stress in steel (σw) as:

σw = Es / Ec × σp = 210000 / 35000 × 1250 = 7500 N/mm²

The test pressure required to produce a tens

ile stress of 0.7 N/mm² in concrete when applied immediately after tensioning is given by:

σpe = fp / α

σpe = 1000 / 0.8 = 1250 N/mm²

Using the value of σpe, we can find the stress in concrete as:

σce = σpe / (1 + Es / Ec)

σce = 1250 / (1 + 210000 / 35000) = 35.29 N/mm²

Using the stress in concrete, we can calculate the test pressure (Ptest) required to produce a tensile stress of 0.7 N/mm² in concrete:

Ptest = σce × D / 2t - σw

= 35.29 × 600 / (2 × t) - 7500

= 106 / t - 7500 N/mm²

Therefore, a non-cylinder prestressed concrete pipe with a 600 mm internal diameter can be designed to withstand a working hydrostatic pressure of 1.05 N/mm².

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In Vogel Approsimation Method, which of the following method is also uocd: a) The Northwest Comer Method b) Minimim Cell Cose Method c) Rectilinear Dieennee Method d) Simplex. Niethod e) Chabysheor Distanoe Misthod.

Answers

The correct option to the question is option A, Vogel’s Approximation Method (VAM) is an approach used for solving transportation problems. It is regarded as an improvement on the Northwest Corner Method since it takes into account the cost of transport between the sources and destinations.

A method similar to Vogel’s Approximation Method (VAM) is the Minimum Cell Cost Method. However, the Minimum Cell Cost Method identifies the cheapest cost and selects it as the first allocation. On the other hand, Vogel's Approximation Method (VAM) is a method that is used to get a better initial feasible solution as compared to the Northwest Comer Method.

The Northwest Comer Method. It is also a method for getting an initial feasible solution for transportation problems. It is a basic method that is simple and straightforward to understand. However, it is not very accurate since it ignores the cost of transportation.

The Rectilinear Distance Method and Chebyshev Distance Method are used to compute the distance between two points. Simplex Method is an algorithm used for linear programming problems to optimize the objective function. Vogel's Approximation Method (VAM) is one of the efficient methods of getting an initial feasible solution for a transportation problem.

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Is computed to take into account first cost, expected lifetime, maintenance costs, fuel costs, replacement cost, inflation, and the time value of money (interest). a. First cost Ob.Maintenance cost Oc. Life-cycle cost

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The term that should be included in the answer to your question is "Life-cycle cost".Life-cycle cost is computed to take into account first cost, expected lifetime.

Maintenance costs, fuel costs, replacement cost, inflation, and the time value of money (interest). It is a complete estimate of the cost of ownership over the entire life of an asset, including the cost of acquisition, operation, maintenance, and disposal.

It is a comprehensive analysis of the cost of an asset over its lifetime, and it takes into account all the relevant costs of ownership, including the initial purchase price, maintenance costs, and replacement costs over the expected lifespan of the asset.

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b) Outline three ways by which the factor of safety against a circular slip failure can be increased.

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The three ways by which the factor of safety against a circular slip failure can be increased are:Increase the angle of friction between the soil mass and the foundation by:Increasing the surface roughness of the foundation.

A rough surface between the soil mass and the foundation would produce more interlocking between the soil and the foundation, resulting in an increase in the angle of friction, leading to an increase in the factor of safety against the slip failure.Using geotextiles.

These are synthetic fabrics or mats that have high tensile strength and are used to improve the performance of soil structures. They improve the frictional characteristics of the soil and prevent the migration of soil particles, which increases the angle of friction and results in an increase in the factor of safety against the slip failure.

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A thick steel pressure vessel, having an inside diameter of 210 mm and outside diameter of Pressure cylinder 275 mm, is subjected to an internal pressure of 65 MPa and an external pressure of 10 MPa. For this thick steel pressure vessel:
Question 1
a. Using Lamé's Theory, develop expressions for radial and circumferential stresses; [50%]
b. Plot the radial and circumferential stresses against the wall thickness of the pressure vessel and identify the maximum values; [30%]
c. Calculate the longitudinal stress in the pressure vessel wall.
[20%]

Answers

A thick steel pressure vessel is subjected to an internal pressure of 65 MPa and an external pressure of 10 MPa. The inside diameter of the pressure vessel is 210 mm and the outside diameter is 275 mm.

Lamé's Theory expression for radial and circumferential stresses:

Radial stress is given by:[tex]σr = (pi*D² /d² - 1)*P/2[/tex]Here, D is the external diameter, d is the internal diameter, and P is the pressure.

[tex]σr = (pi*(275)²/(210)² - 1)*65/2σr = 53.08[/tex]

[tex]σθ = (pi*D² /d² + 1)*P/2σθ = (pi*(275)²/(210)² + 1)*65/2σθ = 122.08 MPa2.[/tex]

For a thick-walled cylinder, the wall thickness, t, is given by:

[tex]t = (D - d) / 2t = (275 - 210) / 2t = 32.5 mm[/tex]

[tex]σr = (pi*D² /d² - 1)*P/2σr = (pi*(275)²/(210)² - 1)*P/2[/tex]

Circumferential Stress,[tex]σθ = (pi*D² /d² + 1)*P/2σθ = (pi*(275)²/(210)² + 1)*P/2[/tex]

For a given internal pressure, the radial and circumferential stresses are directly proportional to the wall thickness of the pressure vessel.

Maximum Radial stress = [tex]110.98[/tex]

MPa Maximum Circumferential stress = 112.1 MPa3.

Longitudinal stress in the pressure vessel wall is given by:

[tex]σL = P*(D/d)σL = 65*(275/210)[/tex]

[tex]σL = 85.7 MPa[/tex]

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Segment A in the urban four-lane divided arterial reference population will be screened by the "Excess Predicted Average Crash Frequency Using SPFs" performance measure. Segment A is 0.60 mi long. If the sliding window method is used to study this segment with a window of 0.30-mi and 0.10-mi increment, how many times will the performance measure be applied on Segment A?

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The sliding window technique is utilized to identify the crash frequency of a certain region. A performance measure called "Excess Predicted Average Crash Frequency Using SPFs" will be used to screen Segment A in the urban four-lane divided arterial reference population.

The segment is 0.60 mi long. Let's determine the number of times the performance measure will be applied to Segment A using the sliding window method.In 0.30-mi windows, the section is analyzed. The increment is 0.10 miles long. As a result,0.30 mi long window = 0.60 / 0.30 = 2 windows.0.10 miles long increment = 0.60 / 0.10 = 6 increments.So, the total number of applications = number of windows × number of increments in each window= 2 × 6= 12.The performance measure will be used 12 times on Segment A. Answer: In 200 words. The sliding window technique is utilized to identify the crash frequency of a certain region. A performance measure called "Excess Predicted Average Crash Frequency Using SPFs" will be used to screen Segment A in the urban four-lane divided arterial reference population. The segment is 0.60 mi long. Let's determine the number of times the performance measure will be applied to Segment A using the sliding window method.In 0.30-mi windows, the section is analyzed. The increment is 0.10 miles long. As a result,0.30 mi long window = 0.60 / 0.30 = 2 windows.0.10 miles long increment = 0.60 / 0.10 = 6 increments.So, the total number of applications = number of windows × number of increments in each window= 2 × 6= 12.The performance measure will be used 12 times on Segment A.

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What steps will you take to implement changes in buying a house? How will you avoid scope creep?

Answers

Buying a house is one of the biggest financial decisions that an individual makes in their lifetime. Buying a house involves a lot of money, time, and effort. Changes are inevitable, and they can occur during the process of buying a house. Scope creep occurs when new and unplanned activities are added to the process of buying a house. Scope creep can lead to an increase in time, money, and effort.

Here are some steps to implement changes in buying a house and avoid scope creep:

1. Develop a clear plan and stick to itA clear plan should be developed at the beginning of the process of buying a house. The plan should include the budget, timeline, and goals. Once the plan is developed, it should be strictly followed. The plan should only be changed when it is absolutely necessary.

2. Clearly define the scope of the projectThe scope of the project should be clearly defined at the beginning of the process of buying a house. The scope should include the activities that are to be performed and the activities that are not to be performed.

3. Monitor the progress of the projectRegular monitoring of the progress of the project is essential. The progress should be compared against the plan. Any deviations should be documented, and corrective action should be taken.

4. Communicate effectivelyEffective communication is critical during the process of buying a house. All stakeholders should be kept informed of any changes. The stakeholders should be provided with regular updates on the progress of the project.

5. Evaluate the impact of changesBefore any changes are implemented, the impact should be evaluated. The impact should be evaluated in terms of time, money, and effort.

6. Manage changes effectivelyChanges should be managed effectively. The changes should be documented, and the impact of the changes should be evaluated. The changes should be communicated to all stakeholders.

7. Establish a change control process A change control process should be established. The change control process should include the steps that are to be taken when changes are requested. The change control process should be strictly followed to avoid scope creep.

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Compute the safe ultimate moment of a T-beam beam with a flange width 2500mm, flange thickness of 80mm, web thickness of 300mm and an overall depth of 900mm. The beam is reinforced with an unbonded tendon having an area Aps = 1000mm2 and located 80mm from the bottom fiber of the beam, fc' =35MPa. The beam has a simple span of 6m.

Answers

The safe ultimate moment of a T-beam beam is 5,930,060.18 N.mm.

Step 1: Calculate the effective depth of the beam Effective depth, [tex]d = h – 0.5tf= 900 – 0.5(80) = 860mm[/tex]

Step 2: Compute the depth of the equivalent rectangular stress block The depth of the equivalent rectangular stress block, a = 0.85d= 0.85 × 860 = 731mm

Step 3: Compute the ultimate compressive strain for the concrete The ultimate compressive strain for the concrete, εcu = 0.0035 + (0.00175/0.45)× (d – a)= 0.0035 + (0.00175/0.45)× (860 – 731)= 0.0042

Step 4: Here we assume da as 0.85d'.d' = d – (tw/2 + a)= 860 – (300/2 + 731) = -191.5mm
[tex]da = 0.85d = 0.85 × 860 = 731mm[/tex]
[tex]Mu = 0.90 × 1.2 × 1860 × 1000 × (860 – 731 – (-191.5))= 3,189,276 N.mm[/tex]
[tex]Mpe = Asfy (d – a – da)/2 = Asfy(0.5d’ + a – da)[/tex]
[tex]415 × 1000 × (0.5(191.5) + 731 – 731) = 80,922 N.mm[/tex]

[tex]As = (Mu)/(0.95×f'c×(d – 0 .5a) + 0.95fy(As)/As)[/tex]
[tex](3,189,276)/(0.95 × 35 × (860 – 0.5 × 731) + 0.95 × 415 × As/1000)[/tex]
[tex]As = 1052.07 mm²[/tex]

Step 5: By substituting the values, we get;
[tex]Mu = 0.95 × 1052.07 × 415 × (860 – 731/2) + 0.95 × 35 × 2500 × 731 × 731/2= 5,930,060.18 N.mm[/tex]
So, the safe ultimate moment of a T-beam beam is [tex]5,930,060.18[/tex] N.mm.

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Communication is very vital during the execution of construction projects. For example, an electrician needs to isolate the electricity supply so that they can work safely. At the same time, a carpenter requires electricity for powered equipment. How ideally could this problem be solved so that nobody's work suffers? Give your own brief assessment of the situation and the possible solution.

Answers

Communication is the key to the successful execution of construction projects. For instance, in a construction project, an electrician will have to isolate the electricity supply to guarantee his safety while working on a project. At the same time, a carpenter would need electricity to operate his power tools.


Ideally, this problem can be solved by arranging a mutual understanding between the electrician and the carpenter. This mutual understanding can include the following:

1. Coordination: The electrician can communicate his work plan to the carpenter. The carpenter can then align his work plan in such a way that he does not need the power supply during the electrician's work.
2. Time Management: The carpenter can work during the electrician's break time to ensure that the carpenter's work does not suffer.
3. Power Supply: The carpenter can use a different power source or generator for his power tools while the electrician is working.

In summary, proper communication and understanding can play a vital role in avoiding conflicts and ensuring that both parties can work safely and efficiently.

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Signe offers Thorne, a health inspector, $5,000 to overlook the violations in her Farm-to-Fork Dining Emporium. Thorne accepts the cash and overlooks the violations. Signe is charged with the crime of bribery. The crime occurred when a. Thorne accepted $5,000 from Signe. b. Signe actually offered $5,000 to Thorne. c. Thorne overlooked the violations. d. Signe decided to offer $5,000 to Thorne.

Answers

Signe offers Thorne, a health inspector, 5,000 to overlook the violations in her Farm-to-Fork Dining Emporium. Thorne accepts the cash and overlooks the violations. Signe is charged with the crime of bribery.

The crime occurred when Signe actually offered 5,000 to Thorne. The crime of bribery is committed when someone voluntarily offers a payment or incentive to another person with the intent of inducing that person to act in a manner that benefits the briber.

The act of bribery involves both the offer of something of value, such as money or property, and the acceptance of that offer by the person who is being bribed. Signe committed the crime of bribery by offering Thorne money to overlook the violations at her Farm-to-Fork Dining Emporium.

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1. Maintenance costs for a small bridge with an expected 50-yr life are estimated to be P 2,000.00 each year for the first 5 years, followed by a P10,000 expenditure in the 15th year and a P 20,000 expenditure in the 25th year. If1 = 12% per year. what is the equivalent uniform annual maintenance costs over the entire 50-yr period?
a. P 1,230
b. P 852
C. P 936
d. P 1,159

Answers

The correct answer is option a. P 1,230.Expected annual maintenance costs over the [tex]first 5 years = P 2,000Expected  costs in the 15th year = P 10,000Expected maintenance costs.

In the 25th year = P 20,000Present Worth of Annual Cost - PWA(P/A,i%,n)PWA(P/A,12%,5) = PWA(P2,000/4.0374) = P495.94PWA(P/A,12%,50) = PWA(P1,000) = 9.8181PWA(P/A,12%,25) = PWA(P1,000/15.5043) = P64.51Present Worth of Cost - PWC(P/F,i%,n)PWC(P/F,12%,15) = PWC(P10,000/4.4876) = P2,229.68PWC(P/F,12%,25) = PWC(P20,000/16.0151) = P1,248.97Total present.

Worth of costs over 50 years = P4,049.10Equivalent uniform annual maintenance costs over the entire 50-yr period = AW(P/A,i%,n)AW(P/A,12%,50) = P4,049.10/(AWF(P/A,12%,50)) = P4,049.10/3.2888 = P1,230.07 (rounded off to the nearest whole number)Therefore, option a is the correct answer.

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Sanitary facilities must be provided on worksites, but drinking water is generally each worker's responsibility.

True

False

Answers

The statement "Sanitary facilities must be provided on worksites, but drinking water is generally each worker's responsibility" is FALSE.

A sanitary facility refers to a place where workers can get clean and safe drinking water and use toilets and hand washing facilities. In the workplace, these facilities are essential to keeping the workers safe and healthy. Employers are required by law to provide clean and safe drinking water, toilets, and hand washing facilities to their employees. This includes facilities for storing and heating food, if necessary. Employers must keep these facilities clean and in good condition so that they can be used safely and comfortably. It is also important to maintain these facilities in a way that is accessible to everyone.The workers' responsibility for drinking waterThe workers are not generally responsible for bringing their drinking water to work. It is the employer's responsibility to provide clean and safe drinking water to their employees. This is true for all industries and types of workplaces. Workers should not have to worry about bringing their drinking water to work or risk becoming dehydrated because of a lack of water at work.ConclusionTherefore, the statement "Sanitary facilities must be provided on worksites, but drinking water is generally each worker's responsibility" is False.

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Calculate the Least Material Condition (LMC) for a part with
a length of 35.00 ± 0.15 (unit in mm)
b. Calculate the Maximum Material Condition (MMC) of the hole diameter
with dimension 10.0 ± 0.10 (unit in mm)

Answers

The MMC of the hole diameter is 10.10 mm. The least material condition (LMC) is the smallest size limit of a part that is acceptable for use.  LMC is the smallest allowable size limit that will still allow the part to function as intended. In this case, we will calculate the LMC for a part with a length of [tex]35.00 ± 0.15 mm.[/tex]

To calculate the LMC, we must subtract the tolerance from the nominal value. The nominal value is the target value of the part dimension. In this case, the nominal value is 35.00 mm.

LMC = Nominal Value - Tolerance LMC = [tex]35.00 - 0.15LMC = 34.85 mm[/tex]

Therefore, the LMC for the given part is 34.85 mm.

The Maximum Material Condition (MMC) is the largest size limit of a part that is acceptable for use. In other words, MMC is the largest allowable size limit that will still allow the part to function as intended. In this case, we will calculate the MMC of the hole diameter with dimension [tex]10.0 ± 0.10 mm[/tex].

To calculate the MMC, we must add the tolerance to the nominal value. The nominal value is the target value of the part dimension. In this case, the nominal value is 10.0 mm.

MMC = Nominal Value + Tolerance MMC = [tex]10.0 + 0.10MMC = 10.10 mm.[/tex]

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engineering controls can be utilized as one element of hazard control

Answers

Engineering controls are an essential element of hazard control in the workplace, providing a means of minimizing or eliminating hazards at their source.

Engineering controls are a type of hazard control that reduces or eliminates the hazard at its source. Engineering controls are used to minimize or eliminate hazards that pose a significant risk of harm or danger to individuals, such as chemical or noise exposure.

These measures are frequently a vital component of an effective occupational health and safety program in the workplace. Examples of engineering controls include the use of ventilation to control fumes, dust, and other airborne hazards, as well as the use of sound barriers to reduce noise levels. In addition, the use of machine guards, interlocks, and other safety devices on equipment and machinery is considered a form of engineering control to safeguard workers from contact with hazardous moving parts.

Other types of engineering controls include changes in the manufacturing process or the substitution of less harmful materials to eliminate the hazard. Engineering controls are an essential element of hazard control in the workplace, providing a means of minimizing or eliminating hazards at their source. These controls, when combined with other forms of hazard control, such as administrative and personal protective equipment, provide a comprehensive approach to worker safety and health.

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A company manufactures electrostatic generators for lab demonstrations and has a capacity of 100,000 units per year. The fixed cost of the process is $150,000. If the generators sell for $70 each, what is the maximum variable cost per unit to break even when production is at 80% of capacity?

Answers

To solve this problem, we need to determine the break-even point. This is the point at which total revenue equals total costs. To calculate the break-even point, we need to find the total cost of producing the generators and then divide that cost by the selling price of the generators.

This will give us the number of generators that need to be sold to break even.Let's begin by calculating the total cost of producing the generators. The total cost is made up of fixed costs and variable costs. Fixed costs are those that do not change with the level of production. Variable costs are those that do change with the level of production.

In this case, we are given that the fixed cost is $150,000. To find the variable cost per unit, we need to use the following formula: Variable cost per unit = (Total cost - Fixed cost) / Number of units produced At 80% of capacity, the number of units produced is:100,000 x 0.8 = 80,000The total cost is made up of the fixed cost and the variable cost:

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Is there any other solution in terms of labor management?The solution defined in question 2) is chosen by the management. The 20 different models fall out in two categories (sales for each are roughly similar):lowend bindings with a materials cost of $12hiend bindings with a materials cost of $28Labor costs are the same for both categories. Is the cost structure likely to modify your manufacturing policy? What can be the financial outcome? Explain with a chart.Can you propose some other alternatives for Courtine Corp. to meet customer demands? If there is any, what kind of data you may need to help you to make decision? Break-Even Point Hilton Inc. sells a product for $69 per unit. The variable cost is $35 per unit, while fixed costs are $323,680. Determine (a) the break-even point in sales units and (b) the break-even point if the selling price were increased to $75 per unit. a. Break-even point in sales units fill in the blank 1 units b. Break-even point if the selling price were increased to $75 per unit fill in the blank 2 units Which of the following is NOT one of the 10 characteristics of a mentally healthy person? a. They feel nood about themselves. B. They maintain lasting and natisfying friendships. C. They make their own decisions. D. They offer help to people who need it. Cecilia Alvarez had always wanted to see Singapore. This was her chance. A round-trip airfare on Singapore Airlines (premium economy) from San Francisco where she lived was SNG1344.31. A three-night stay at the Mandarin Oriental, an excellent hotel overlooking the marina (and just so happens to have one of the best breakfasts in all of Singapore) was quoted to at SNG2998.28. If the current spot rate was SNG1.4140=USD1.00, what would just air travel and hotel cost Cecilia in U.S. dollars? Round to two decimal places. In a survey of 1070 people, 738 people said they voted in a recent presidential election. Voting records show that 66% of eligible voters actually did vote. Given that 66% of eligible voters actually did vote, (a) find the probability that among 1070 randomly selected voters, at least 738 actually did vote. (b) What do the results from part (a) suggest? Question 2 1 pts Calculate the Schwarzschild radius for a black hole of mass equal to 2 solar masses. Use the information given in Example 24.1 (and appendix E). Enter the numerical answer in meters (don't type in the unit). You have an error margin of +/-100. A population of values has a normal distribution with = 100.4 and = 53.3. A random sample of size n = 125 is drawn. Find the probability that a sample of size n = 125 is randomly selected with a mean