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Len [333]
3 years ago
9

What is the best coefficient of performance for a refrigerator that cools an environment at -26.0°C and has heat transfer to ano

ther environment at 50.0°C?
Physics
1 answer:
azamat3 years ago
6 0

Answer:

COP = 4.25

Explanation:

It is given that,

Cooling temperature, T_c=-26^{\circ}C=273-26=247\ K

Heating temperature, T_h=50^{\circ}C=323\ K

We need to find the coefficient of performance. It is given by :

COP=\dfrac{T_h}{T_h-T_c}

COP=\dfrac{323}{323-247}

COP = 4.25

So, the best coefficient of performance of a refrigerator is 4.45 Hence, this is the required solution.

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What is the field outside the capacitor plates in a parallel capacitor?​
FrozenT [24]

Answer is zero

Plz mark me brainlist

7 0
3 years ago
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A car travels 2,000 mi at a<br> constant speed of 70 mi/hr.<br> How long did the trip take?
ella [17]

Answer:

<h2>28.57 hours</h2>

Explanation:

The time taken can be found by using the formula

t =  \frac{d}{v}  \\

d is the distance

v is the velocity

From the question we have

t =  \frac{2000}{70}  =  \frac{200}{7}  \\  = 28.571428 ...

We have the final answer as

<h3>28.57 hours</h3>

Hope this helps you

5 0
3 years ago
Read 2 more answers
63°C = _____ 63 K 336 K 210 K 163 K
Nata [24]
Is is the second one. 336 k. 273.15K= 0C.
3 0
3 years ago
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A 15-µF capacitor and a 25-µF capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energ
Alborosie

Answer:

Energy stored, E = 0.072 J

Explanation:

Given that,

Capacitance, C_1=15\ \mu F

Capacitance, C_2=25\ \mu F

These two capacitor are connected in parallel, and charged to a potential difference of, V = 60 volts

We know that in parallel combination of capacitor, the equivalent capacitance is given by :

C=C_1+C_2\\\\C=(15+25)\ \mu F\\\\C=40\times 10^{-6}\ F

The energy stored in the capacitor is given by :

E=\dfrac{1}{2}CV^2\\\\E=\dfrac{1}{2}\times 40\times 10^{-6}\times (60)^2\\\\E=0.072\ J

So, the energy stored in the capacitor in this capacitor combination is 0.072 J.

4 0
4 years ago
A) The motor speed is less than wheel speed.
n200080 [17]

For the following statements

A) The motor speed is less than wheel speed.

B) The output power of the motor is positive during hill climbing.

C) The wheel torque is more than motor torque

These assertions are given respectively as

  • false
  • true
  • false
<h3>What are speed, power, and Torque?</h3>

Speed: defined as the ratio of operation with respect to distance and time

Power: defined as the ability to work

Torque: This is the speed of a rotating object

Generally, the equation for Speed, Power, Torque  is mathematically given as

V=m/s

P=w/t

T=rfsin\theta

In conclusion

For a moving car, the wheels speed is in equilibrium with the motor speed Hence false

The output power during a hill climb is positive cause work is been done, Hence true

The wheel torque also is in equilibrium with the motor Torque, Hence false

Read more about Work

brainly.com/question/756198

5 0
3 years ago
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