Briefly discuss if it would be better to operate with pumps in parallel or series and how your answer would change as the steepness of the system curve changes?

Answer:

1141

7.2

Explanation:

The evaporator Temperature T1 = -10°C

h1 = 244.55kj/kg

S1 = 0.93782kj/kg

The enthalpy at second state from given condenser pressure from super heated refrigerant table

P2 = 600

S2 = S1

h2 = 267.19kj/kg

Enthalpy at 3 and 4 from condenser pressure

h3 = h4 = 81.5kj/kg

To get cooling load

QL = m(h1-h4)

M= 7

= 7(244.55-81.5)

= 7(163.05)

= 1141.35kw = 1141KW

COP

= h1-h4/h2 -h1

= 244.55-81.5/267.19-244.55

= 163.05/22.64

= 7.2

Answer:

E

Explanation:

The vander waals equation

[tex](P+n^2a/V^2)(V-nb)[/tex]=nRT

The factor n^2a/V^2 accounts for the attractive forces between the gases molecules whereas nb accounts for the decrease in volume occupied by the gas. Therefore, correct option would be  E. None of the above have BOTH of the two factors accurately stated

The correction of Van Der Waal to the ideal gas equation is that; real gas molecules exert forces on each other and that gas molecules have volume.

Van Der Waal (1873) proposed a modification to the ideal gas equation; PV = nRT. The ideal gas law assumes that molecules of gases do not have a definite volume but occupies the same volume as the container and do not exert any attractive forces on each other.

However, Van Der Waal introduced two major corrections to the ideal gas equation;

Hence, the ideal gas equation is now written as;

[tex](P + \frac{an^2}{V^2}) (V - nb) = nRT[/tex]

Learn more: https://brainly.com/question/6249935

Answer:

Power of a machine is defined as its rate of doing work. It is the rate of transfer of energy. The power of a machine is said to be one watt if it can work at the rate of one joule in one second.

Explanation:

Answer:

its to show the shape is flat and only flat at the botom and top and you can set it up ther way and it wlll still look the same.

Explanation:

O rings and valve seals are used to block a path to prevent escape of a liquid or a gas.

The cylinder head controls air or fuel flow in and out of the cylinders.

The O ring in cylinder head is placed into a groove to secure them in place. They are compressed between two surfaces to have a seal pack. The O-ring or valve seal creates a air and liquid-tight mating surface.

Thus, O rings and valve seals are used to block a path to prevent escape of a liquid or a gas.

Learn more about cylinder head.

https://brainly.com/question/18204706

#SPJ2

Answer:

roughly 13,or 12, or 11

Explanation:

Answer:

B) Attenuation

Explanation:

Attenuation can be regarded as the loss of signal strength which could be as a result of both external and internal factors. This loss of signal strength could occur in networking cables as well as other connections. Attenuation is a loss in energy, because as signal travels, its strength decreases as a a result of distance it covers, this loss of energy is due to the signal trying to overcome the resistance at the medium. One of the main the causes of attenuation is When there is Extra noise on available networks, networks such as electrical current as well as radio waves. It should be noted that attenuation is Signal loss which is the reduction of a signal that occurs in a medium as a function of the physical length of the channel.

Singnal attenuation can taken care of by using lower loss materials with high cost, instead of making of PCB routing length reduction. Amplifiers can also be engaged in amplifying attenuated signal to get back the original signal, this will compensate the loss.

Attenuation can be measured in decibels(dB), this gives the measurement of relative strengths of one signal at two different point or measurement of two signals.

Answer:

A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire. The amount of voltage induced depends on the rate of change of the magnetic field flux and the number of turns of wire (if coiled) exposed to the change in flux.

Please mark Brainliest!

A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire.

The amount of voltage induced depends on the rate of change of the magnetic field flux and the number of turns of wire (if coiled) exposed to the change in flux.

The interaction of the electromagnetic field, all electrically charged things, and all objects with magnetic moments.

One of the universe's four fundamental interactions is the electromagnetic interaction. This interaction includes all atomic, electrical, magnetic, and electromagnetic phenomena as well as light and light fields.

Therefore, A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire.

To learn more about Electric field, refer to the link:

https://brainly.com/question/29291836

#SPJ2

Answer:

(C) passive state.

Explanation:

The earth pressure is the pressure exerted by the soil on the shoring system. They are three types of earth pressure which are:

a) Rest state: In this state, the retaining wall is stationary, this makes the lateral stress to be zero.

b) Active state: In this state, the wall moves away from the back fill, this leads to an internal resistance. Hence the active earth pressure is less than earth pressure at rest

c) Passive state: In this state the wall is pushed towards the back fill, this leads to shearing resistance. Hence, the passive earth pressure is greater than earth pressure at rest

Answer:

Following are the solution to the given question:

Explanation:

The material is necessary to cook since frying is a speedy process for evaporation.

Drug A is now in the compressed fluid area, and the material would not boil if the pressure is chilled. Because the ship is solid, its substance A claim is false.

Unless the volume comprises of a drop in the heat, the B substance reaches a vapor pressure area and a wet region. That's the area that melting may occur. His claim for material B could therefore be true.

Answer: The Republican

Explanation:

Answer:

I think its A

Explanation:

Answer: Front View.

Explanation:

Since the design of the developers for the project is based around creating a component with a 3⁄4 thick plywood. The only view he should consider should be the front view, so it will be easier to show the project to potential buyers or clients who are typically more concerned about aesthetics by using the front view.

Answer:

C

Explanation:

N = Na.P/A------(1)

Na = avogadro's number = 6.02210²³

P = density

A = atomic weight of metal

When we substitute into equation 1 above we get

1.0x10²⁹atoms/m³

From here we calculate the number of vacancies

T = 1000⁰c = 1273K

The formula to use is

Nv= Nexo(Qt/K.T) -----(2)

Qt = 1.22eV

K = Boltzmann's constant = 8.6210x10^-5

When we substitute values into equation 2

We get Nv = 1.49 x 10²⁴m-3

Therefore option c is correct

Check attachment for a more detailed calculation of this question

Answer:

See detailed explanation and image attached

Explanation:

1 mole of 1-pentanol reacts with 1 mole of benzhydrol

Number of moles in 1.5 g of benzhydrol = mass/molar mass = 1.5 g/184 g/mol = 0.008 moles of benzhydrol

x moles of 1-pentanol reacts with 0.008 moles of benzhydrol

x = 0.008 moles of 1-pentanol

If 1 mole occupies 22.4 L

0.008 moles occupies 22.4 * 0.008 moles = 0.179 L of 1-pentanol is required.

The mechanism of the formation of n-pentyl benzhydryl ether involves the protonation of the -OH group in benzhydrol. This is followed by loss of water molecule creating a carbocation which is attacked by the 1-pentanol.  Abstraction of a proton by a base completes the mechanism, regenerates the acid and yields the n-pentyl benzhydryl ether as shown in the image attached.

The synthesis of diethyl ether occurs by protonation of one ethanol molecule followed by SN2 attack by anothe ethanol molecule and a simultaneous loss of a water molecule. Deprotonation by a base yields the  diethyl ether

Answer:

[tex]3:1[/tex]

[tex]50\ \text{lb}[/tex]

Explanation:

[tex]F_r=150\ \text{lb}[/tex]

Mechanical advantage is will be the ratio of the distances from the wheel axle of the forces.

[tex]MA=\dfrac{6}{2}\\\Rightarrow MA=3:1[/tex]

The ideal mechanical advantage of the system is [tex]3:1[/tex].

The moment in the system is conserved so moment about the wheel axle is

[tex]M_e=M_r\\\Rightarrow 6F_e=2F_r\\\Rightarrow F_e=\dfrac{2F_r}{6}\\\Rightarrow F_e=\dfrac{2\times 150}{6}\\\Rightarrow F_e=50\ \text{lb}[/tex]

The required effort force is [tex]50\ \text{lb}[/tex].

Answer:

Yes, they are

Explanation:

A

Assuming that a glass piece is cooled from an elevated temperature, then the internal stresses which are also called thermal stresses, gets inroduced due to result of the difference in cooling rate and that of the thermal contraction that exists between the surface and the interior regions. They can lead to fractures such as thermal shock, as a result, we deem these thermal stresses important.

B

Yes, they are. They are introduced upon heating due to the thermal expansion that takes place

Answer:

Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. A similar process, weathering, breaks down or dissolves rock, but does not involve movement.Erosion is the opposite of deposition, the geological process in which earthen materials are deposited, or built up, on a landform.

Most erosion is performed by liquid water, wind, or ice (usually in the form of a glacier). If the wind is dusty, or water or glacial ice is muddy, erosion is taking place. The brown color indicates that bits of rock and soil are suspended in the fluid (air or water) and being transported from one place to another. This transported material is called sediment.

Explanation:

Physical erosion describes the process of rocks changing their physical properties without changing their basic chemical composition. Physical erosion often causes rocks to get smaller or smoother. Rocks eroded through physical erosion often form clastic sediments. Clastic sediments are composed of fragments of older rocks that have been transported from their place of origin.Landslides and other forms of mass wasting are associated with physical weathering. These processes cause rocks to dislodge from hillsides and crumble as they tumble down a slope. 

Landslides and other forms of mass wasting are associated with physical weathering. These processes cause rocks to dislodge from hillsides and crumble as they tumble down a slope.  

Plant growth can also contribute to physical erosion in a process called bioerosion. Plants break up earthen materials as they take root, and can create cracks and crevices in rocks they encounter.

Answer:

Explanation:

Both technicians are right

Answer:

a building project...

Explanation:

Answer: C. The bank teller's level of education

Explanation:

When shopping around for a bank, some of the factors that an individual should consider include the fees charged by the bank, the services provided by the bank and the minimum balance that one must have in order to maintain the account opened.

One is not concerned with the bank teller's level of education. This is the concern of the management of the bank and the human resource department. It is the management that will determine the kind of person they want any for the position and the level of education he or she must have.

Therefore, the correct option is C.

Answer:

Explanation:

Maximum power will be delivered to the load if

Z(load) = Z(t)*

If the Thevenin is defined as Z(t) = R(t) + jX(t), then the load impedance will be

Z(load) = Z(t)* = R(t) - jX(t)

Finding the equivalent impedance, we have that

Z(eq) = Z(t) + Z(load)

Simplifying further, we have

Z(eq) = R(t) + jX(t) + R(t) - jX(t)

Z(eq) = 2R(t)

Therefore, maximum power will be delivered to the load when Z(load) = Z(t)*

Maximum power will be delivered to a pure resistance table if

R(load) = |Z(t)|

Again, if we define the impedance of Thevenin, we have

Z(t) = R(t) + jX(t)

And therefore, our load resistance is

R(load) = √[R(t)² + X(t)²]

Answer:

end mill 4 flute

Explanation:

you can simply hook it up

Answer:

39⁰

Explanation:

We have cohesion c = 25kpa

Then the normal stress = 39kpa

Shear stress = 56kpa

This question is asking us to find the angle of internal friction

Shear stress at the time of failure = cohesion C + normal stresstanΦ

56 = 25 + 39tanΦ

Φ = angle if refractive index

Φ = 38.48⁰

This is approximately 39⁰

Therefore in answer to this question, the angle of internal friction for the soil is nearly 39⁰

S

Solution :

Given:

Power, P = 200 hp

              = 110000 lbf ft/s

Speed, N = 3600 rpm

Power , [tex]$P=\frac{2 \pi NT}{60}$[/tex]

∴ Torque, [tex]$T = \frac{60 P}{2 \pi N}$[/tex]

[tex]$T = \frac{60 \times 110000}{2 \pi \times 3600}$[/tex]

T = 291.93 lb -ft

[tex]$T_{allow} = 20,250 \ psi$[/tex] ---- allowable shear stress

Therefore, torque , T = 391.93 lb-ft

                              T   = 291.93 x 12 lb-in

∴ T 3503.16 lb-in

Now from the Torsion formula,

[tex]$\frac{T}{J}=\frac{T_{allow}}{ r}$[/tex]

Here, [tex]$r=\frac{d}{2} ; \ \ \ J=\frac{\pi d^4}{32}$[/tex]   ---- polar moment of inertia.

∴ [tex]$\frac{T}{\frac{\pi d^4}{32}}=\frac{T_{allow}}{ d/2}$[/tex]

[tex]$T_{allow}=\frac{16 T}{\pi d^3}$[/tex]

[tex]$\pi d^3=\frac{16 \times 3503.16}{20520}$[/tex]

[tex]$\pi d^3 = 2.7315$[/tex]

[tex]$d^3 = 0.8699$[/tex]

or [tex]$d= (0.8699)^{1/3}$[/tex]

d = 0.9546 in

Therefore the diameter of the shaft is 0.9546 in.

Incomplete question. The remaining part of the question read;

How did the potential energy of the two vehicles change? Did the potential energy of one vehicle change more than the other? Why do you think so?

Explanation:

1. The potential energy of the two vehicles increased because we could observe that they have unlike poles moving towards the center of the magnet. So the magnet field would be repealing both toy vehicles.

2. The potential energy of the pink vehicle change more than the purple vehicle. This is evident as we notice the pink vehicle is closer to the center of the magnet than the other.

3. The reason for this is because Lucia exerts more force (potential energy) on the pink vehicle to fight the repelling effect of the magnet

Answer:

1. The potential energy of the two vehicles increased because we could observe that they have unlike poles moving towards the center of the magnet. So the magnet field would be repealing both toy vehicles.

2. The potential energy of the pink vehicle change more than the purple vehicle. This is evident as we notice the pink vehicle is closer to the center of the magnet than the other.

3. The reason for this is because Lucia exerts more force (potential energy) on the pink vehicle to fight the repelling effect of the magnet

Explanation:

Explanation:

uuui ielts k oshru with the best of my life u