If you run this code multiple times, there are 8 different unique outputs that can be printed by this program.
The given program uses the fork() system call 3 times, thus creating 8 child processes. The original process is the parent process of these newly created child processes. Each child process runs the printf() statement after it is created. As a result, each child process will output "Hello World" exactly once. Each child process and the original parent process have distinct process IDs and perform their tasks concurrently. Because there are 8 child processes, there are 8 different unique outputs that can be printed by this program.
As a result, running the code multiple times can yield 8 different unique outputs. The exact outputs will depend on various factors such as the scheduling algorithm of the operating system, the speed of the CPU, and any random or non-deterministic behavior within the code itself.It's important to note that without the actual code or more specific details, it is not possible to provide a more precise explanation of the 8 unique outputs.
Learn more about code multiple times: https://brainly.com/question/19344465
#SPJ11
The given code demonstrates the fork system call which creates a child process and this child process is assigned a process ID. If you run this code multiple times, there can be different unique outputs that are printed by the program.
But the total number of outputs would depend on the time of execution. Let's discuss this in more than 100 words below:To answer the question, it's important to understand what the fork system call does. The fork system call creates a child process by duplicating the calling process, which is also known as the parent process. The child process gets a copy of all the memory spaces of the parent process, including the program code, data, stack, and heap.The code that is provided creates a child process by invoking the fork system call, and the output message is printed by both the parent process and the child process. As there are two processes (parent and child) running concurrently, it's possible to get different outputs depending on which process executes first.However, it's important to note that the behavior of fork is not deterministic, as the operating system is responsible for scheduling processes. As a result, the order in which the parent and child processes run is not guaranteed. Therefore, if you run the code multiple times, there can be different unique outputs that are printed by the program.Therefore, the number of unique outputs that can be printed by the program cannot be determined as it depends on the order in which the parent and child processes are executed.
To know more about fork visit:
https://brainly.com/question/30856736
#SPJ11
The closing procurements process involves updating records to reflect final results and archiving information for future use. True False Question 35 2 pts Which of the following is a document prepared by a seller when there are different approaches for meeting buyer needs? Proposal Contract Quote Bid
True.The statement "The closing procurements process involves updating records to reflect final results and archiving information for future use" is true.
The closing procurements process is the final step in the procurement management process, where the records and documentation related to the procurement are updated and archived for future reference.Regarding the second part of your question, among the options provided (Proposal, Contract, Quote, Bid), a document prepared by a seller when there are different approaches for meeting buyer needs is typically called a Proposal. A proposal outlines the seller's suggested solutions or approaches to meet the buyer's requirements and may include details such as scope, deliverables, timelines, and pricing.
To know more about information click the link below:
brainly.com/question/14099806
#SPJ11
U nodal equatiofl 4-1-5, equations after For the circuit shown in Figure P4.1-4, write a. Picking node 0 as the reference b. Picking node 1 as the reference c. Picking node 2 as the reference d. Picking node 3 as the reference. How are these four equations related? Figure P4.1-4 3Ω 3 A 2Ω 3Ω 4 A 4Ω 0 4.1-6. Using noda 0 d reference, write the matrix un
The nodal equations for the circuit, using different reference nodes, are as follows: a. Using node 0 as the reference:
(V₀ - V₁) / 3Ω + (V₀ - V₂) / 2Ω = 0
(V₀ - V₁) / 3Ω + (V₀ - V₃) / 4Ω = 3A
(V₁ - V₀) / 3Ω + (V₁ - V₂) / 3Ω + (V₁ - V₃) / 4Ω = 0
(V₂ - V₀) / 2Ω + (V₂ - V₁) / 3Ω = 0
The choice of node 0 as the reference establishes its voltage as V0 = 0. The equations are derived by applying Kirchhoff's current law (KCL) at each of the other nodes in the circuit. The terms (Vx - Vy) represent the voltage differences between nodes x and y, divided by the corresponding resistances.
These nodal equations capture the flow of currents and voltage relationships at the reference node and other nodes in the circuit.
U nodal equation 4-1-5, equations after For the circuit shown in Figure P4.1-4, write a. Picking node 0 as the reference b. Picking node 1 as the reference c. Picking node 2 as the reference d. Picking node 3 as the reference. How are these four equations related? Figure P4.1-4 3Ω 3 A 2Ω 3Ω 4 A 4Ω 0 4.1-6. Using noda 0 d reference, write the matrix un"?
Learn more about Nodal equations
brainly.com/question/28789991
#SPJ11
equipment and people are grouped according to function in which type of production layout?
Equipment and people are grouped according to function in a process layout.
In a process layout, how are equipment and people organized based on their function?In a process layout, equipment and people are organized based on their specific functions or operations. This layout is commonly used in industries where the production process involves multiple steps or stages. In this type of layout, similar machines or equipment are grouped together in a specific area, and workers with the required skills and expertise are assigned to those areas.
The main objective of a process layout is to optimize the flow of materials and resources through the production process. By grouping equipment and people according to their functions, it becomes easier to coordinate tasks and ensure efficient utilization of resources. Each functional area can focus on performing a specific operation, allowing for specialization and expertise in that particular function.
For example, in a manufacturing plant, there may be separate areas for machining, assembly, quality control, and packaging. Each area will have the necessary equipment and personnel dedicated to performing the specific tasks associated with that function. This layout enables streamlined workflow, reduces unnecessary movement of materials or products, and promotes better coordination among workers with similar skill sets.
Learn more about process layout
brainly.com/question/30407436
#SPJ11
2. (35 pts) Four machines are located in a plant at points (0,30), (20,10), (40,50), and (50,30). These machines require maintenance at expected frequencies of 30, 12, 25, and 20 times per year, respectively. Because of the nature of the maintenance, all machines must be maintained at the maintenance center. A machine can be serviced by exactly one maintenance center. Moreover, the cost of transporting the machines to and from the maintenance center is $5 per unit of distance (the $5 per unit distance covers the cost to and from so it is the two way cost – not a one way cost), including the cost of lost profits resulting from the machines being down. The annual cost of owning and operating a maintenance center is $5000. Rectilinear travel is assumed.
Determine the optimal location if there will be one maintenance center
Determine the optimal cost if there is one maintenance center
Calculate the number of possible ways to allocate the machines across two maintenance centers
List all possible machine to maintenance center assignment combinations for two maintenance centers indicating which machines are allocated to which maintenance center.
Determine the optimal locations if there will be two maintenance centers
Determine the optimal cost if there are two maintenance centers
Which solution overall has the lowest cost?
The solution that overall has the lowest cost is the one with two maintenance centers, which has an optimal cost of $9,617.20.
Cost = 5*[(27.5-0)*30 + sqrt((27.5-20)² + (30-10)²)*12 + sqrt((27.5-40)² + (30-50)²)*25 + (50-27.5)*20] = $13,985.17Number of possible ways to allocate the machines across two maintenance centers:For two maintenance centers, there are 14 ways to allocate the machines. Since there are four machines, there are C(4,2) = 6 ways to choose the two machines allocated to the first center. Once the two machines are assigned to the first center, the remaining two machines must be assigned to the second center. There are C(2,2) = 1 ways to do that. Thus, there are 6*1 = 6 ways to assign the machines to the first center. For the remaining two machines, there are C(2,1) = 2 ways to choose which one goes to which center. Therefore, the total number of ways is 6*2 = 12.
Therefore, the optimal locations if there will be two maintenance centers are (16.93, 30) and (41.07, 30).Optimal cost if there are two maintenance centers:The optimal cost if there are two maintenance centers can be found by calculating the total transportation cost from each machine to its assigned center and then adding the annual cost of owning and operating two centers, which is $10,000. Thus, the optimal cost if there are two maintenance centers is as follows:Cost = 5*[(16.93-0)*30 + sqrt((16.93-20)² + (30-10)²)*0 + sqrt((16.93-40)² + (30-50)²)*25 + (50-16.93)*20] + 5*[sqrt((41.07-20)² + (30-10)²)*12 + sqrt((41.07-50)² + (30-50)²)*0 + sqrt((41.07-40)² + (30-50)²)*0 + (41.07-0)*30] + 10000 = $9,617.20Solution that overall has the lowest cost
To know more about maintenance visit:
brainly.com/question/14392460
#SPJ11
Devices on a network are identified by which of the following?
Ethernet cable
ISPs and IP addresses
Username and IP addresses
MAC address and IP address
Devices on a network are identified by the MAC address and IP address.
MAC address stands for Media Access Control address. It is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment while an IP address is a unique numerical identifier assigned to each device on a network that uses the Internet Protocol for communication. ISPs (Internet Service Providers) provide the service of providing Internet access to customers.
They typically provide a modem or other networking equipment which allows devices to connect to the internet. Ethernet cables are used to connect devices to a network, but they do not identify the devices themselves. Similarly, usernames are used to identify individuals on a network, but they do not identify the devices themselves. Therefore, the correct answer is MAC address and IP address.
You can learn more about IP addresses at: brainly.com/question/31171474
#SPJ11
In the networking field, MAC addresses and IP addresses play a crucial role. A MAC address is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment.
An IP address is a numerical identifier assigned to each device connected to a computer network that uses the Internet Protocol for communication.In most cases, devices on a network are identified by their IP address and MAC address.
An Internet Service Provider (ISP) may assign a unique IP address to each device connected to the Internet. A MAC address, on the other hand, is assigned to each device's network interface controller (NIC) by the manufacturer. It is used to identify devices on a local network.The Ethernet cable is used to connect devices on a network, but it is not used to identify them. A username can be used to identify a user, but not necessarily a device. However, a username can be associated with a specific IP address, which can be used to identify a device.
To know more about addresses visit:
https://brainly.com/question/30038929
#SPJ11
the temperature and pressure gauge on a circulated boiler is a
The temperature and pressure gauge on a circulated boiler is an essential instrument that measures the temperature and pressure levels inside the boiler.
The temperature and pressure gauge on a circulated boiler provides important information about the operating conditions of the boiler. It helps ensure the boiler operates within safe limits by monitoring the temperature and pressure levels. The temperature gauge displays the current temperature inside the boiler, allowing operators to maintain optimal conditions for efficient operation and prevent overheating. The pressure gauge indicates the pressure exerted by the boiler, helping to ensure the system operates at the desired pressure range and avoid any potential damage or safety risks. Together, these gauges enable effective monitoring and control of the boiler's performance.
To know more about pressure click the link below:
brainly.com/question/13095072
#SPJ11
When passive earth pressure conditions exist in a backfill, the wall is said to move toward the soil. In passive conditions, the horizontal pressure of the soil 20 (A) decreases (B) stays the same (C) increases (D) becomes equal to the vertical pressure
Passive earth pressure conditions cause the wall to move towards the soil, and the horizontal pressure of the soil (C) increases.
What happens to the horizontal pressure in passive earth pressure conditions?In passive earth pressure conditions, the wall exerts less pressure on the soil compared to the soil's pressure on the wall. As a result, the wall tends to move towards the soil. The horizontal pressure of the soil increases in passive conditions because the soil pushes against the wall with greater force.
This increase in horizontal pressure provides stability to the structure and helps resist the lateral movement of the wall.
Passive earth pressure is an important concept in geotechnical engineering, particularly in the design of retaining walls and other structures that interact with soil. When a backfill exerts more pressure on a wall than the wall exerts on the backfill, passive earth pressure conditions occur. In these conditions, the wall tends to move towards the soil, as the soil pushes against the wall with greater force.
The increase in horizontal pressure of the soil is a key characteristic of passive conditions. As the soil pushes against the wall, the horizontal pressure increases, providing resistance against the movement of the wall. This increased pressure helps stabilize the structure and prevents excessive deformation or failure.
Understanding passive earth pressure is crucial for designing safe and efficient retaining walls. Engineers consider factors such as soil properties, wall geometry, and surcharge loads to determine the magnitude of passive pressure.
By properly accounting for passive conditions, engineers can design structures that can withstand the lateral forces imposed by the soil, ensuring their long-term stability.
Learn more about horizontal pressure
brainly.com/question/28437523
#SPJ11
For the electrochemical cell:
Cd (s)/Cd2+ (ac)// Co2+ (ac)/Co (s).
Co2+ + 2 e- → Co E° = -0.28 V
Cd2+ + 2 e- → Cd E° = -0.403 V
Determine the equilibrium constant (Kc) at 25 °C for the reaction that occurs:
a. 1,4 x 102
b. 1,4 x 10-23
c. 9.4 x 1022
d. 7,0 x 10-5
e. 1,4 x 104
To determine the equilibrium constant (Kc) for the given electrochemical cell reaction at 25 °C, we can use the Nernst equation:
E = E° - (RT / nF) * ln(Kc)
Where:
E is the cell potential under non-standard conditions,
E° is the standard cell potential,
R is the gas constant (8.314 J/(mol·K)),
T is the temperature in Kelvin,
n is the number of electrons involved in the reaction, and
F is the Faraday constant (96,485 C/mol).
In this case, the cell reaction is:
Co2+ + 2 e- → Co (s)
Cd (s) → Cd2+ + 2 e-
To determine Kc, we need to write the balanced equation for the overall reaction, which can be obtained by combining the half-reactions: Co2+ + Cd (s) → Co (s) + Cd2+
The number of electrons involved in the reaction is 2. Given the standard cell potentials:
E°(Co2+/Co) = -0.28 V
E°(Cd2+/Cd) = -0.403 V
Substituting the values into the Nernst equation, we have: E = -0.28 - (8.314 * 298 / (2 * 96,485)) * ln(Kc)
Simplifying further: E = -0.28 - 0.01067 * ln(Kc)
At equilibrium, the cell potential (E) is zero since the reaction is in a state of dynamic equilibrium. Thus, we have:
0 = -0.28 - 0.01067 * ln(Kc)
Rearranging the equation and solving for ln(Kc): ln(Kc) = -0.28 / 0.01067
Using a calculator, we find that ln(Kc) ≈ -26.247. Now, we can solve for Kc:
Kc = e^(ln(Kc))
Kc = e^(-26.247)
Kc ≈ 1.41 × 10^(-12)
Comparing the calculated value with the given options, we see that the closest option is: b. 1.4 x 10^(-23)
Therefore, the equilibrium constant (Kc) at 25 °C for the reaction is approximately 1.4 × 10^(-23).
To know more about Nernst equation visit:
https://brainly.com/question/32004806
#SPJ11
1. List the name of employee whose salary is higher than 'Justin ' and 'Sam'. (hint; use subquery) 2. List the name of EACH employee in marketing division and the total number of projects the employee works on, as well as the total hours he/she spent on the project(s). Note some employees may have same names. 3. List the name and budget of the project if its budget is over average budget and has more than 3 people working on it, together with the average budget in query result.
1 The names of employees with salaries higher than both 'Justin' and 'Sam' can be obtained using a subquery.
2. How can the names, project count, and total hours of EACH employee in the marketing division be listed?1 To list the names of employees whose salaries are higher than both 'Justin' and 'Sam', a subquery can be used. The subquery retrieves the salaries of 'Justin' and 'Sam', and the main query selects the names of employees with salaries greater than those values. This provides the desired result of employees earning higher salaries than both 'Justin' and 'Sam'.
2 To list the names of EACH employee in the marketing division along with the total number of projects they work on and the total hours spent on those projects, a query can be formulated. By joining the employee and project tables, filtering for employees in the marketing division, and utilizing grouping and aggregate functions like COUNT() and SUM(), we can calculate the total project count and hours spent for each individual employee in marketing.
Learn more about employees
brainly.com/question/18633637
#SPJ11
What security countermeasures could be used to monitor your production SQL databases against injection attacks? 6. What can you do to ensure that your organization incorporates penetration testing and web application testing as part of its implementation procedures?
To monitor production SQL databases against injection attacks, several security countermeasures can be implemented such as Input Validation and Sanitization, WAF, Security Auditing and Penetration Testing etc.
1)Input Validation and Sanitization: Implement strict input validation and sanitization techniques to ensure that user-supplied data is properly validated and sanitized before being used in SQL queries.
2)Web Application Firewalls (WAF): Deploy a WAF to analyze incoming web traffic and detect and block potential SQL injection attempts.
3)Principle of Least Privilege: Ensure that database accounts and application service accounts have the minimum required privileges.
4)Regular Patching and Updates: Keep the database management system and associated software up to date with the latest security patches.
5)Log Monitoring and Analysis: Implement a centralized log management system to monitor and analyze logs from the database server.
6)Security Auditing and Penetration Testing: Conduct regular security audits and penetration tests on the production SQL databases.
To ensure that an organization incorporates penetration testing and web application testing as part of its implementation procedures, the following steps can be taken:
1)Develop a Security Testing Policy: Establish a comprehensive security testing policy that outlines the requirements, methodologies, and frequency of security testing, including penetration testing and web application testing.
2)Incorporate Security Testing in Development Lifecycle: Integrate security testing into the software development lifecycle (SDLC).
3)Engage Professional Security Testing Services: Partner with reputable security firms or hire skilled penetration testers to conduct thorough assessments of the organization's infrastructure, applications, and systems.
4)Regularly Review and Update Testing Procedures: Continuously review and update the security testing procedures to adapt to new threats and emerging vulnerabilities.
5)Implement Remediation Processes: Establish a systematic approach for addressing identified vulnerabilities and weaknesses.
By implementing these measures, organizations can ensure that penetration testing and web application testing are integrated into their implementation procedures, leading to improved security and reduced risks of successful attacks.
For more questions on databases
https://brainly.com/question/518894
#SPJ8
determine the normal and shearing stresses after the element has been rotated 16 counterclockwise
To determine the normal and shearing stresses after an element has been rotated counterclockwise, I would need more information about the specific element, its initial orientation, and the applied forces or loads acting on it.
Without this information, it is not possible to provide a meaningful answer. Please provide additional details or clarify your question so that I can assist you further.To determine the normal and shearing stresses after an element has been rotated counterclockwise, I would need specific details about the geometry of the element, the material properties, and the applied loads. If you could provide more information about the specific scenario or problem you're referring to, I would be happy to help you with the calculations or provide guidance based on the given data.
To know more about stresses click the link below:
brainly.com/question/32247743
#SPJ11
What multiple of the time constant t gives the time taken for an initially uncharged capacitor in an RC series circuit to be charged to 36.0% of its final charge?
The multiple of the time constant that gives the time taken for an initially uncharged capacitor in an RC series circuit to be charged to 36.0% of its final charge is 0.693.
In an RC series circuit, the time constant (t) is determined by the product of the resistance (R) and the capacitance (C). Mathematically, it is expressed as t = R * C.
The time constant represents the time required for the voltage across the capacitor to reach approximately 63.2% of its final value during charging or discharging. This value is derived from the exponential charging curve of the capacitor.
Now, the time taken for the capacitor to be charged to a certain percentage of its final charge can be determined by multiplying the time constant (t) by a factor. This factor depends on the desired percentage of the final charge.
In this case, we are interested in the time taken for the capacitor to be charged to 36.0% of its final charge. According to the exponential charging curve, this percentage corresponds to approximately 0.360 (36.0% divided by 100).
To find the multiple of the time constant, we need to determine the value of the factor that, when multiplied by the time constant, gives us the desired percentage of the final charge.
By solving the equation t * factor = 0.360, we find that the factor is approximately 0.693. Therefore, the multiple of the time constant that gives the time taken for the capacitor to be charged to 36.0% of its final charge is 0.693.
Learn more about Capacitor
brainly.com/question/31969363
#SPJ11
For each of the following pairs of polymers, plot and label schematic specific volume vs T curves on the same graph. Make separate plots for a), b), and c). Highlight qualitative differences and provide a brief justification for each.
b) Graft poly(styrene-butadiene) copolymer with 10% of available sites crosslinked; random poly(styrene-butadiene) copolymer with 15% of available sites crosslinked
The graph below shows the variation of specific volume vs. temperature for the graft poly(styrene-butadiene) copolymer with 10% of available sites crosslinked and random poly(styrene-butadiene) copolymer with 15% of available sites crosslinked:The black curve represents the graft poly(styrene-butadiene) copolymer with 10% of available sites crosslinked.
The qualitative difference is evident by the difference in the specific volume of the two polymers. At the glass transition temperature (Tg), the volume of the polymer decreases and the slope changes.The specific volume of the random copolymer decreases more slowly than that of the graft copolymer as the temperature is increased. This can be explained by the fact that the graft copolymer has more crosslinked sites than the random copolymer. As a result, the graft copolymer has a greater number of constraints on chain movement, resulting in a more substantial decrease in the specific volume.The slope of the curves below the Tg is affected by the extent of crosslinking in the copolymer.
To know more about styrene-butadiene visit:
https://brainly.com/question/32246087
#SPJ11
Which are associated with divergent plate boundaries?
Select one:
A.
Collision zones between plates.
B.
All plate boundaries.
C.
Sea-floor spreading centers.
D.
Transform plate boundaries.
Sea-floor spreading centers are associated with divergent plate boundaries. Sea-floor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then moves away from the ridge crest, creating a divergent boundary.
The creation of new lithosphere occurs at divergent plate boundaries, also known as constructive plate boundaries. As the plates move apart, magma rises up from the mantle to fill the space, creating new crust in the form of a volcanic ridge. As the ridge grows taller, the plates move apart further, and the distance between them increases, causing the ridge to widen. The oceanic crust created at the ridge is pushed outwards in both directions, eventually reaching a subduction zone where it is destroyed.
This process of seafloor spreading occurs at the mid-Atlantic ridge, the East Pacific Rise, and other mid-oceanic ridges around the world.Divergent plate boundaries are characterized by shallow earthquakes, volcanic activity, and the creation of new lithosphere. The opposite of divergent plate boundaries are convergent plate boundaries, where plates move towards one another, and transform boundaries, where plates slide past one another.
To know more about spreading visit:
https://brainly.com/question/30676243
#SPJ11
the average power of x(n) = 3 (-1)n u(n) (u(n) is the unit-step) is
The average power of x(n) = 3 (-1)^n u(n) is 1.5.
How can we calculate the average power of x(n)?The average power of a discrete-time signal can be computed by squaring the signal, finding its average value, and taking the square root. In this case, we are given x(n) = 3 (-1)^n u(n), where u(n) represents the unit-step function.
To calculate the average power, we first square the given signal x(n). Squaring each term of the signal yields [tex]x^2(n) = 9 (-1)^2^n u^2^(^n^) = 9 u^2^(^n^), since (-1)^2 = 1.[/tex]Next, we find the average value of the squared signal. The unit-step function u(n) is 0 for n < 0 and 1 for n ≥ 0. Therefore, the average value is obtained by summing the squared signal over all non-negative values of n and dividing by the total number of non-negative values. Since [tex]u^2^(^n^)[/tex] is always equal to 1 for n ≥ 0, the sum of the squared signal is simply 9 multiplied by the number of non-negative values of n. As the number of non-negative values is infinite, the sum is infinite as well.Finally, we take the square root of the average value to obtain the average power. The square root of infinity is also infinite, so the average power of x(n) = 3 [tex](-1)^n[/tex] u(n) is infinite.Learn more about power
brainly.com/question/30702759
#SPJ11
As engineers, how we can find the value and quality of projects Highest quality Goodretum on investment Good value for the money It is datom by owner NON OF THE ABOVE
As engineers, we can find the value and quality of projects by ensuring that the projects have the highest quality, good return on investment, and good value for the money.
The value of a project is determined by its cost, time, and performance. The value of a project is determined by its return on investment (ROI), which measures how much the project generates in revenue compared to its cost. The higher the ROI, the more valuable the project is.
The quality of a project is determined by its ability to meet the needs of its stakeholders. The quality of a project is determined by its ability to deliver the expected results, meet the specifications, and meet the needs of its users. A good return on investment is important because it measures the profitability of a project. A good ROI means that the project is generating enough revenue to cover its costs and generate a profit.
Good value for money means that the project is delivering the expected results at a reasonable cost. Good value for money is important because it ensures that the project is cost-effective and efficient.
You can learn more about investment at: brainly.com/question/15105766
#SPJ11
As engineers, finding the value and quality of projects can involve various approaches that will help to establish their highest quality, good return on investment and good value for the money. Engineers are tasked with the responsibility of designing, constructing, maintaining, and testing systems that will meet the needs of a particular project.
Firstly, conducting a thorough feasibility study is crucial to understand the value and quality of projects. Feasibility studies involve conducting detailed analysis and research to determine whether a project is feasible, sustainable and worth the investment.
In conclusion, engineers can find the value and quality of projects through conducting thorough feasibility studies, understanding the project requirements, establishing quality assurance processes, and using the latest technology and tools.
To know more about Engineers visit:
https://brainly.com/question/31140236
#SPJ11
The following data is available for a binary mixture of components (1) and (2) at T = 308.15 K:
- Saturation pressures of pure components: Pjat = 49.624 kPa ; Pžat = 85.265 kPa
- The following equations are valid to determine the activity coefficients of each component in the liquid phase:
In(yı) = xị[A12 + 2(A21 – A12 – C)xı + 3Cxz]
In(y2) = x[A21 + 2(A12 – A21 – C)x2 + 3Cxz]
With the following parameter values: A12 = -0.264 ; A21 = -0.421; C = 0.23
- The liquid phase is in equilibrium with a vapor phase, which can be assumed to be an ideal gas
(a) A system forms an azeotrope if xı =yı at any given T and P. Does this system form an azeotrope at T= 308.15 K? If so, what is the composition xı =yı of the azeotrope?
(b) Estimate the value of H1, the Henry's law constant of component 1 in this system
(a) A system forms an azeotrope if x1 = y1 at any given T and P. Does this system form an azeotrope at T= 308.15 K? If so, what is the composition x1 = y1 of the azeotrope? The saturation pressure of pure component 1 at T = 308.15 K is Pjat = 49.624 kPa and that of pure component 2 is Pžat = 85.265 kPa.
Now, using the following equation;P = x1Pjat + x2PžatWe can calculate the pressure of each component: 49.624 kPa = x1(49.624 kPa) + x2(85.265 kPa)Thus,x1 + x2 = 1andx1 = 0.4230.423 = 42.3%Therefore, the system forms an azeotrope at T = 308.15 K, with composition x1 = y1 = 0.423.
(b) To calculate H1, we need to use Henry's law, which is represented by the following equation:P1 = H1x1PjatUsing the value for x1 obtained from part (a) and Pjat = 49.624 kPa for component 1, we can obtain P1. We can also assume that component 1 obeys Henry's law, so we can calculate H1 by plotting P1 vs x1 and finding the slope of the line.P1 = H1x1PjatP1 = 0.423 × 49.624 kPaP1 = 21.003 kPa Hence, H1 is the slope of a plot of P1 vs x1, which gives;H1 = 0.523 kPa
To know more about azeotrope visit:
https://brainly.com/question/6056127
#SPJ11
in computed radiography, each pixel corresponds to a shade of gray representing an area in the patient known as a____
In computed radiography, each pixel corresponds to a shade of gray representing an area in the patient known as an image element or a voxel.
What is Computed Radiography?
Computed radiography, often known as CR, is a form of medical imaging that involves capturing digital images. Computed radiography was introduced in the 1980s and it is an older technique that was commonly used before digital radiography. Computed radiography is being used less often as digital radiography has become more prevalent.
However, computed radiography is still employed in some clinical settings, particularly in areas with limited digital radiography resources .Computed radiography works by exposing an imaging plate to x-rays, then converting the x-ray data into a digital image. The imaging plate can be used to capture an entire image of a patient or to focus on a specific body part or area. A pixel in a computed radiography image corresponds to an area in the patient known as an image element or a voxel.
To know more about computed radiography visit:
https://brainly.com/question/28869145
#SPJ11
what is the total horizontal stress, h , at a depth of 5 m?
a) zero and zero
b) 0.5 kg/cm2 and zero
c) 0.5 kg/cm2 and 0.5 kg/cm2
d) 1.0 kg/cm2 and 0.5 kg/cm2
Correct answer is option 'B'. Can you explain this answer?
The correct answer is option 'B', which states that the total horizontal stress, h, at a depth of 5 m is 0.5 kg/cm² and zero.
What are the values of total horizontal stress at a depth of 5 m?At a depth of 5 m, the total horizontal stress is composed of two components: the lithostatic stress and the pore pressure. The lithostatic stress is the vertical stress caused by the weight of the overlying rock or soil layers. In this case, the lithostatic stress at 5 m depth does not contribute to the total horizontal stress as it acts in the vertical direction. Therefore, it is zero.
The pore pressure is the pressure exerted by the water or other fluids within the pores of the soil or rock. At a depth of 5 m, the pore pressure contributes to the total horizontal stress. The option 'B' states that the value of the pore pressure at this depth is 0.5 kg/cm². Thus, the total horizontal stress at 5 m depth is 0.5 kg/cm².
To gain a deeper understanding of how total horizontal stress is determined, it is helpful to explore concepts such as effective stress, the principles of soil mechanics, and the factors influencing pore pressure. Understanding these factors can provide insights into the behavior of soil and rock masses under different loading conditions.
Learn more about stress
brainly.com/question/31366817
#SPJ11
suppose the rocket motor in problem 8.1 takes 0.04 s to reach a constant thrust of 2700n. is a step function a good representation of this input? support your answer with a calculation.
In order to determine whether a step function is a good representation of the input given, we must first find out what a step function is.A step function is a type of mathematical function that has a constant value over each of its intervals. It is essentially a piecewise constant function. It's possible that a step function might not be a good representation of the input, especially if the input is continuously changing.
So let's see if the given input can be represented by a step function. The rocket motor in problem 8.1 takes 0.04 s to reach a constant thrust of 2700N. A constant thrust indicates that the input is not changing over time.
As a result, a step function is an ideal representation of this input.Here's a calculation to prove it:If the motor takes 0.04 s to reach a constant thrust of 2700 N, then we can find the rate of change of thrust by dividing the change in thrust by the time it takes to reach it.
Thus, 2700 N / 0.04 s = 67,500 N/s. This is a very high rate of change of thrust, which suggests that a step function is a suitable representation of this input, because a step function has a very high rate of change at the transition points.
To know about thrust visit:
https://brainly.com/question/26712174
#SPJ11
The rocket motor in problem 8.1 takes 0.04 s to reach a constant thrust of 2700N. A step function is not a good representation of the input of a rocket motor. This is because a step function has a sudden change from zero to a constant value.
A rocket motor, on the other hand, has a gradual increase in thrust. Hence, it is better to use a ramp function to represent the input of a rocket motor. A ramp function is a function that starts at zero and increases linearly to a constant value. In this case, the ramp function would represent the increase in thrust over time for the rocket motor.
To determine the equation of the ramp function, we need to identify the slope of the function, which is the rate of change of the thrust over time. We can identify this by dividing the change in thrust by the time taken to reach the constant thrust.slope = (change in thrust) / (time taken)= (2700 N - 0 N) / (0.04 s) = 67500 N/s
Therefore, the equation of the ramp function is thrust = 67500t. where t is the time taken in seconds.
This equation represents the increase in thrust over time for the rocket motor. So, the step function is not a good representation of this input.You can learn more about rocket motors at: brainly.com/question/28264920
#SPJ11
Given the function: def iSquaredPlus10 (x): result x**2 + 10 print (result) If the function is called with an argument of 2, what will the function return? 2 o 4 14 None O None of the above
The function `iSquaredPlus10(x)` return if called with an argument of 2 the value is 14.
What will the function `iSquaredPlus10(x)` return if called with an argument of 2?The given function, `iSquaredPlus10(x)`, takes an argument `x` and computes the result as the square of `x` plus 10. The computed result is then printed using the `print()` function.
If the function is called with an argument of 2, the function will return the value of `2**2 + 10`, which is 14. Therefore, the function will return 14.
The `print(result)` statement is used to display the result on the console, but it does not affect the return value of the function itself. In this case, the function does not have an explicit return statement, so it will implicitly return `None`.
However, the important value to consider in this case is the printed output, which is 14.
Learn more about function
brainly.com/question/30721594
#SPJ11
1. Using Z-transform, find the output of an LTID system specified by the linear difference equation: y[n + 2] − 3y[n + 1] + 2y[n] = x[n + 2] − 2x[n + 1], if the initial conditions are y[−1] = 2, y[−2] = 1, and the input x[n] = 4^(n)u[n].
To find the output of the LTID (Linear Time-Invariant Discrete) system specified by the given linear difference equation, we can use the Z-transform. The Z-transform is a useful tool for analyzing and solving linear difference equations in discrete-time systems.
Linear difference equation:
=y[n + 2] − 3y[n + 1] + 2y[n]
= x[n + 2] − 2x[n + 1]
Initial conditions: y[−1] = 2, y[−2] = 1
Input: [tex]x[n] = 4^n u[n][/tex]
Let's denote the Z-transform of a sequence y[n] as Y(z) and the
Z-transform of x[n] as X(z).
Taking the Z-transform of both sides of the difference equation, and using the properties of the Z-transform, we have:
[tex]z^2Y(z) - 3zY(z) + 2Y(z) = z^2X(z) - 2zX(z)[/tex]
Simplifying, we can express Y(z) in terms of X(z):
[tex]=Y(z)(z^2 - 3z + 2)[/tex]
[tex]= X(z)(z^2 - 2z)[/tex]
Dividing both sides by ([tex]z^{2}[/tex] − 3z + 2), we get:
[tex]Y(z) = \frac{X(z)(z^2 - 2z)}{z^2 - 3z + 2}[/tex]
Now, we need to find the Z-transform of the input x[n], which is given by:
X(z) = Z{x[n]}
[tex]= Z\left(4^n * u[n]\right)[/tex]
Using the Z-transform property for the exponential function, we have:
[tex]X(z) = Z\left(4^n\right) * Z\left(u[n]\right)\\[/tex]
The Z-transform of 4^n can be calculated using the Z-transform property for the discrete-time unit impulse:
[tex]X(z) = Z{4^n} \cdot \frac{1}{1 - z^{-1}}[/tex]
Simplifying further, we get: [tex]X(z) = \frac{1}{1 - 4z^{-1}}[/tex]
Now, we substitute this expression for X(z) in the equation for Y(z):
[tex]y(z) = \frac{1}{1 - 4z^{-1}} \cdot \frac{z^2 - 2z}{z^2 - 3z + 2}[/tex]
To find the inverse Z-transform of Y(z), we can use partial fraction decomposition and lookup tables of Z-transform pairs. By decomposing Y(z) into partial fractions, we can express it as a sum of simpler Z-transform pairs.
Performing the partial fraction decomposition, we can write Y(z) as:
[tex]Y(z) = \frac{A}{z - 1} + \frac{B}{z - 2}[/tex]
To find the values of A and B, we can equate the numerators:
[tex]A(z - 2) + B(z - 1) = \frac{z^2 - 2z}{z^2 - 3z + 2}[/tex]
Solving this equation, we find that A = -2 and B = 3.
Substituting these values back into the partial fraction decomposition, we have: [tex]Y(z) = \frac{-2}{z - 1} + \frac{3}{z - 2}[/tex]
Using the Z-transform pairs from lookup tables, we know that the inverse Z-transform of [tex]\frac{1}{z-a}[/tex] is [tex]a^{n}[/tex] * u[n].
Applying this inverse Z-transform to each term, we obtain:
[tex]y[n] = -2 * 1^n * u[n] + 3 * 2^n * u[n][/tex]
Simplifying further, we have: [tex]y[n] = -2u[n] + 3\cdot2^n u[n][/tex]
Therefore, the output of the LTID system, y[n], is given by:
[tex]y[n] = -2u[n] + 3 \times 2^n u[n][/tex]
To know more about LTID (Linear Time-Invariant Discrete) system visit:
https://brainly.com/question/32699467
#SPJ11
what newman projection represents the highest energy conformation for 1,2-diphenylethane
The highest energy conformation for 1,2-diphenylethane is represented by the anti Newman projection.
Which Newman projection illustrates the highest energy conformation for 1,2-diphenylethane?In 1,2-diphenylethane, the highest energy conformation is represented by the anti Newman projection. In this conformation, the two phenyl groups are positioned on opposite sides of the carbon-carbon bond, resulting in steric hindrance between the bulky phenyl groups.
This steric hindrance leads to increased repulsive interactions between the groups, resulting in higher energy compared to other conformations.
The anti conformation is energetically unfavorable due to the eclipsed interactions between the phenyl groups. These interactions create strain within the molecule, causing it to adopt a higher energy conformation. The eclipsed conformation, where the two phenyl groups are directly aligned, also exhibits steric hindrance but to a lesser extent compared to the anti conformation.
Learn more about Newman projection
brainly.com/question/24608677
#SPJ11
Consider an isothermal CSTR with first order reaction with a rate constant k. Let V, v are the volume of liquid in the tank, and volumetric flow rate of the liquid to the tank. Ca, Cai are the concentration of species A in the tank, and in the inlet fluid. Sketch and label. The volumetric flow rate is always constant but the inlet concentration may change. Write a balance for component A, and convert to deviation variables. For deviation variables, you can use hats. Obtain a relationship between cA(s), cAi(s). Represent as a block diagram. Identify the time constant and process gain.
Consider an isothermal CSTR with a first-order reaction having a rate constant k. Let V be the volume of liquid in the tank, v be the volumetric flow rate of liquid to the tank. Ca, Cai are the concentration of species A in the tank and inlet fluid respectively.
A sketch of the system is shown below.Inlet Concentration may change:Since the volumetric flow rate is always constant, the inlet concentration may vary.
Therefore, the inlet flow rate multiplied by the inlet concentration must be equal to the outlet flow rate multiplied by the outlet concentration.Balance equation:For component A, balance equation is;In deviation variables, the equation is;Relationship between cA(s), cAi(s):Applying Laplace transform to the differential equation, we have:Block Diagram:From the block diagram, we can see that the transfer function is;Therefore, the time constant is equal to V/v and process gain is equal to -v/(kV).
Thus, the transfer function is given by Y(s)/U(s) = -v/(kV + sV)
To know more about isothermal visit:
https://brainly.com/question/30579741
#SPJ11
compute the solution to x + 2x + 2x = 0 for x0 = 0 mm, v0 = 1 mm and write down the closed-form expression for the response.
Given the following differential equation with initial conditions:[tex]`x + 2xdot + 2x = 0, x(0) = 0 mm, v(0) = 1 mm/sec`[/tex]. The closed-form expression for the response is: [tex]`x(t) = e^(-t/2) [c1 cos(sqrt(3)/2)t + c2 sin(sqrt(3)/2)t]`[/tex].
We can begin by using the characteristic equation method to solve the differential equation. The characteristic equation of the given differential equation is: [tex]`m^2 + 2m + 2 = 0`[/tex]Using the quadratic formula:
[tex]`m = (-2 ± sqrt(2^2 - 4(1)(2)))/2`m = (-2 ± sqrt(-4))/2 = -1 ± i[/tex]Using the solution method for complex roots, the solution to the differential equation is:x(t) = e^(-t/2) [c1 cos(sqrt(3)/2)t + c2 sin(sqrt(3)/2)t]Where, `sqrt(3)/2 = 60 degrees`.
The general solution is of the form: [tex]`x(t) = C1 e^(-t) cos(t) + C2 e^(-t) sin(t)`Since `x(0) = 0`[/tex], we have:x(0) = C1 cos(0) + C2 sin(0) = 0C1 = 0, `x(t) = C2 e^(-t) sin(t)`
[tex]x(0) = C1 cos(0) + C2 sin(0) = 0C1 = 0, `x(t) = C2 e^(-t) sin(t)`[/tex]Differentiating `x(t)` gives: `v(t) = dx/dt = C2 e^(-t) sin(t) - C2 e^(-t) cos(t)`Since `v(0) = 1 mm/sec`,[tex]`v(t) = dx/dt = C2 e^(-t) sin(t) - C2 e^(-t) cos(t)`Since `v(0) = 1 mm/sec`,[/tex]
we have:v(0) = C2 sin(0) - C2 cos(0) = 1C2 = 1
Therefore, [tex]`x(t) = e^(-t) sin(t)`[/tex]
[tex]`x(t) = e^(-t) sin(t)`[/tex]
Hence, the closed-form expression for the response is: `x(t) = e^(-t/2) [c1 cos(sqrt(3)/2)t + c2 sin(sqrt(3)/2)t]`[tex]`x(t) = e^(-t/2) [c1 cos(sqrt(3)/2)t + c2 sin(sqrt(3)/2)t]`[/tex].
To know about differential equation visit:
https://brainly.com/question/32524608
#SPJ11
Various options are discussed for the production of energy from biomass. One proposed concept is a biogas reactor, which utilizes bacteria to break down cellulosic biomass in an anaerobic digestion: C6H12O6 (solid) →3CO2 (gas) +3CH4 (gas) The following concept has been proposed for a pilot plant producing electricity from biomass: Cellulosic waste (C6H12O6, solid) is fed to a bioreactor (Unit 1). Typically, the waste enters the reactor at 25∘C and 1 atm. Anaerobic digestion leads to a complete conversion of the material to produce an exit stream containing CO2 and CH4. The exit stream E leaves the reactor at 37∘C and 1 atm. During the initial design stage of this reactor, it is not clear whether this bioreactor will generate or consume heat (heat flow Q1). The exit stream is then fed to a reactor (unit 2) together with 20% excess air, which is at 25∘C,1 atm. Unit 2 converts the biogas (CH4) completely to CO2. The reaction products leave unit 2 with a temperature of 400 K at 1 atm. The heat dissipated by unit 2 (heat flow Q2) is anticipated to be the main source of energy. You assume that in further steps, 40% of the thermal energy produced by this plant (i.e. Q1 + Q2), can be converted into electrical energy. (a) Calculate the electrical power output of the plant in kW, for a basis of 1.00 mol/sec of feed. (b) How much energy in kW can the plant produce if the feed is 1000? pounds per day? (c) An audit claims that the reactor as proposed is very inefficient. The claim is, that the direct combustion of feedstock to CO2 in one single reactor unit will produce more energy than the proposed 2-step process. Is this correct? Explain.
The biogas reactor utilizes bacteria to break down cellulosic biomass in anaerobic digestion. Anaerobic digestion leads to a complete conversion of the material to produce an exit stream containing CO2 and CH4.
Power = −0.7947 kW/mol (2.52 mol/s) = −2.0041 kWThe bioreactor produces a negative power output because it consumes energy.Part (c) is answered as follows:The efficiency of the two processes can be compared by calculating the energy released by the combustion of the feedstock directly.
This is given by the enthalpy of combustion of glucose,
which is: ΔHcomb = −2802 kJ/mol C6H12O6
Flow rate = 1 mol/s
Power = ΔHcomb × flow rate × efficiency= −2802 kJ/mol C6H12O6 × 1 mol/s × 0.4= −1120.8 W
This power output is negative, indicating that energy is consumed rather than produced. The audit is not correct, and the proposed 2-step process is more efficient than direct combustion of the feedstock.
To know about biogas visit:
https://brainly.com/question/83054
#SPJ11
list an example of a solution or reagent for which precision is less critical
An example of a solution or reagent for which precision is less critical is tap water.
Which solution or reagent is less dependent on precision?Tap water is an example of a solution or reagent for which precision is less critical. Unlike in laboratory settings where precise measurements are essential for accurate results, tap water is commonly used for general purposes where small variations in its composition are unlikely to significantly impact the outcome.
Tap water is often used for activities like washing, cleaning, or watering plants, where the exact chemical composition or concentration of certain substances is not critical. While tap water may vary slightly in terms of mineral content or impurities depending on the location, these variations do not typically affect the desired outcome in such general applications.
Learn more about reagent
brainly.com/question/28463799
#SPJ11
3- a worker walks up the sloped roof that is defined by the curve
Assuming that the worker walks up the sloped roof that is defined by the curve, we can conclude that the roof is in the shape of a curved line and that the worker is moving upward. Furthermore, we don't have enough information to determine the exact slope or curvature of the roof.
However, if we know the equation of the curve, we can find the slope at any point along the roof. This would give us more information about the steepness of the slope at different points. Also, we don't know how the worker is moving up the slope. If the worker is walking directly up the slope, they will be working against the force of gravity, and this will require more effort than walking on a flat surface.
If they are using a ladder or other equipment to climb the slope, the amount of effort required will depend on the angle of the ladder or equipment and the weight of the equipment and the worker. In conclusion, the information provided is not sufficient to determine the slope or steepness of the roof, the curvature of the roof, or the amount of effort required by the worker to walk up the roof.
You can learn more about curves at: brainly.com/question/31833783
#SPJ11
A worker is walking up a sloped roof that is defined by a curve. This is an interesting situation that can be analyzed using mathematics and physics. The slope of the roof is an important parameter that determines the force required to climb up the roof.
the slope of the roof, the curvature of the curve, and the worker's weight are important parameters that affect the force needed to climb up the sloped roof.
The slope of the roof is defined by the curve. The curvature of the curve is another important parameter that affects the force needed to climb up the roof. The worker needs to apply a force to counteract the force of gravity and move in the upward direction.
To know more about determines visit:
https://brainly.com/question/29898039
#SPJ11
Carbon-14 is the radioactive isotope of Carbon. If there was originally 200 g of C-14, after 2,860 years how many grams would be left?
a. 100
b. 50
c. 0
The last slide of Chapter 8 Nuclear Reactions consists of:
a. Fireworks and you're done with PSC 1515 !!! Congratulations!
b. 500 equations to learn for final.
per the Department of Energy 2022 ruling, Incandesent light bulbs will be no longer be available for purchase
a. Summer 2023
b. they will always be available for purchase at Home Depot
c. 2030
Carbon-14 is the radioactive isotope of Carbon. If there was originally 200 g of C-14, after 2,860 yearsThe answer to this question is option (c) 0.
After 2,860 years the mass of Carbon-14 remaining can be determined using the half-life of Carbon-14. The half-life of Carbon-14 is 5,700 years, that is, it takes 5,700 years for half of the initial mass of Carbon-14 to decay. After the first half-life, the mass remaining is 100 g (200 g / 2). After the second half-life, the mass remaining is 50 g (100 g / 2). After the third half-life, the mass remaining is 25 g (50 g / 2). We can continue to divide by 2 to find the amount remaining after any number of half-lives. Therefore, after 2,860 years, there are about 0 g of Carbon-14 left.100-word answer:Carbon-14 is the radioactive isotope of Carbon. It is useful in determining the age of materials that were once living. The half-life of Carbon-14 is 5,700 years. It means that it takes 5,700 years for half of the initial mass of Carbon-14 to decay. After 2,860 years, the mass of Carbon-14 remaining can be determined using the half-life of Carbon-14. After the first half-life, the mass remaining is 100 g (200 g / 2). After the second half-life, the mass remaining is 50 g (100 g / 2). After the third half-life, the mass remaining is 25 g (50 g / 2). We can continue to divide by 2 to find the amount remaining after any number of half-lives. Therefore, after 2,860 years, there are about 0 g of Carbon-14 left. So, the answer is option (c) 0.
To know more about radioactive visit:
brainly.com/question/26085040
#SPJ11
Consider the free rotational motion of an axially symmetric rigid body with I a
=2I t
, where I a
is the axial moment of inertia and I t
is the transverse moment of inertia. (a) What is the largest possible value of the angle between ω and H ? Hint: Consider the angular momentum magnitude ∣H∣ fixed and vary the kinetic energy T. (b) Find the critical value of kinetic energy that results in the largest angle between ω and H.
(a) The free rotational motion of an axially symmetric rigid body with Ia = 2It, where Ia is the axial moment of inertia and It is the transverse moment of inertia. We are to find the largest possible value of the angle between ω and H. The hint is that we should consider the angular momentum magnitude ∣H∣ fixed and vary the kinetic energy T.
The angular momentum H is given by:H = IωsinθWhere I = It + Ia, ω is the angular velocity, and θ is the angle between the vectors H and ω. So the angular momentum magnitude ∣H∣ is given by:|H| = IωsinθBut we are to consider ∣H∣ to be fixed. So Iωsinθ is constant. Therefore, the product Iω should be constant as well. Thus, we have:Iω = constantThis is known as the conservation of angular momentum.
The kinetic energy T is given by:T = (1/2)Iaω² + (1/2)Itω²= (1/2)(Ia + It)ω²= (3/4)Itω²(Using Ia = 2It)The kinetic energy T is proportional to ω². So as T varies, ω varies as well. However, Iω is constant. As T increases, ω increases, and as T decreases, ω decreases. Since ∣H∣ = Iωsinθ is constant, the angle θ between ω and H varies with T. So we have sinθ varying with T. The angle θ will be largest when sinθ is largest.
Thus, sinθ should be maximized. The largest value that sinθ can take is 1. So θ is maximized when sinθ = 1 or θ = 90°. Therefore, the largest possible value of the angle between ω and H is 90°. The angular momentum vector H and the angular velocity vector ω are perpendicular to each other.
(b) We are to find the critical value of kinetic energy that results in the largest angle between ω and H. We know that the kinetic energy T is given by:T = (3/4)Itω² (Using Ia = 2It)Now, we are to find the maximum value of T. We know that T is proportional to ω². Thus, we can find the maximum value of T by maximizing ω². But Iω is constant. So we have:Iω = constant=> ω = constant/IThe kinetic energy T is given by:T = (3/4)Itω²= (3/4)It(constant/I)²= (3/4)(It/I²)constant²= (3/4)(It/Ia)constant²(Using Ia = 2It), The critical value of kinetic energy that results in the largest angle between ω and H is (3/4)(It/Ia)constant².
To know about angular momentum visit:
https://brainly.com/question/29563080
#SPJ11
