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Novosadov [1.4K]
3 years ago
5

An air conditioner running with R-134a on a cycle executed under the saturationdome between the pressure limits of 0.8 MPa and 0

.12 MPa. Calculate themaximum Coefficient of Performance of this heat pump.
Physics
1 answer:
ohaa [14]3 years ago
8 0

Answer:

The COP of the system is = 4.6

Explanation:

Given data

Higher pressure  = 1.8 M pa

Lower pressure = 0.12 M pa

Now we have to find out high & ow temperatures at these pressure limits.

Higher temperature corresponding to pressure 1.8 M pa

T_{H} = 62.9 °c = 335.9 K

Lower temperature corresponding to pressure 0.2 M pa

T_{L} = - 10.1 °c = 262.9 K

COP of the system is given by

COP = \frac{T_{L} }{T_{H} -T_{L}   }

COP = \frac{335.9}{335.9 -262.9}

COP = 4.6

Therefore the COP of the system is = 4.6

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A student conducts an experiment in which a cart is pulled by a variable applied force during a 2 s time interval. In trial 1, t
fredd [130]

Answer:

The answer is "Including all three studies of 0s to 2s, that shift in momentum is equal".

Explanation:

Its shift in momentum doesn't really depend on the magnitude of its cars since the forces or time are similar throughout all vehicles.

Let's look at the speed of the car

F = m a\\\\a =\frac{F}{m}

We use movies and find lips

\to v = v_0 + a t\\\\\to v = v_0 + (\frac{F}{m}) t

The moment is defined by

\to p = m v

The moment change

\Delta p = m v - m v_0

Let's replace the speeds in this equation

\Delta p = m (v_0 + \frac{F}{m t}) - m v_0\\\\\Delta p = m v_0  + F t - m v_0\\\\\Delta p = F t

They see that shift is not directly proportional to the mass of cars since the force and time were the same across all cars.

5 0
3 years ago
___________ are things that a scientist keeps the same during an experiment.
Keith_Richards [23]

Answer:

independent variable

Explanation:

3 0
3 years ago
The SI unit for pressure is the
ra1l [238]

Answer:

The SI unit of pressure is Pascal .

4 0
3 years ago
What is one of the drawbacks to the use of solar energy for generating electricity?
-Dominant- [34]
Solar energy is one of the renewable energy sources that is invested around the world because of its large potential. the sun as a free source can sometimes bring a drawback. one of the drawbacks is that it cannot be harnessed when storms or rains are present in the weather. it is also expensive and young.
7 0
3 years ago
Find the equivalent resistance, the current supplied by the battery and the current through each resistor when the specified res
VLD [36.1K]

Answer:

R_{eq} = 19  Ω,   I = 0.105 A,   V1 = 1.05 V  and    V2 = 0.95 V

Explanation:

The correct way to solve this type of problem is to find the current or voltage values for the equivalent resistance and from here find the other values.

For a series circuit the equivalent resistance is the sum of the resistance

      R_{eq}= R1 + R2

       R_{eq} = 10 +9

       R_{eq} = 19  Ω

Let's use the equation for the voltage

     V = I R_{eq}

      I = V /  R_{eq}

      I = 2/19

      I = 0.105 A

In a series circuit the current is constant, so let's use the voltage equation for each resistor

     V1 = I R1

     V1 = 0.105 10

     V1 = 1.05 V

     V2 = 0.105 9

     V2 = 0.95 V

Note that the sum of this voltage is the total voltage applied.

6 0
3 years ago
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