1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zolol [24]
3 years ago
5

During each cycle, a refrigerator ejects 610 kJ of energy to a high-temperature reservoir, and takes in 505 kJ of energy from a

low-temperature reservoir. (a) Determine the work done on the refrigerant in each cycle. kJ (b) Determine the coefficient of performance of the refrigerator.
Physics
1 answer:
jenyasd209 [6]3 years ago
8 0

Answer

A. the work done on the refrigerant in each cycle is 105kJ

B the coefficient of performance of the refrigerator is 4.8

Explanation

Given data

Work done at high temperature T2 Qh=610kJ

Work done at low temperature T1 Ql=505kJ

We know that the net work done by the refrigerator is expressed as

Wnet= Qh-Ql

=610-505

=105kJ

Also we know that the coefficient of performance is expressed as

COP= Ql/Wnet

COP= 505/105

= 4.8

You might be interested in
Which of the following is NOT a result of supernova explosions? The neutron core is completely destroyed. Any planets within a f
DanielleElmas [232]

Answer:

 The neutron core is completely destroyed

Explanation:

 A earth - supernova is an explosion resulting to the death of a star that occurs close enough to the earth but this does not completely destroy a star. Supernovae are the most violent explosions in the universe. But they do not explode like a bomb explodes, blowing away every bit of the original bomb. Rather, when a star explodes into a supernova, its core survives. The reason for this is that the explosion is caused by a gravitational rebound effect and not by a chemical reaction. Stars are so large that the gravitational forces holding them together are strong enough to keep the nuclear reactions from blowing them apart. It is the gravitational rebound that blows apart a star in a supernova.

4 0
3 years ago
Can someone pleaseeee answer this !!!!!!
LenaWriter [7]

Answer:

The person with locked legs will experience greater impact force.

Explanation:

Let the two persons be of nearly equal mass (say m)

The final velocity of an object (person) dropped from a height H (here 2 meters) is given by,

v=\sqrt{2gH}

(g = acceleration due to gravity)

which can be derived from Newton's equation of motion,

v^2=u^2+2aS

Now, the time taken (say t ) for the momentum ( mv ) to change to zero will be more in the case of the person who bends his legs on impact than who keeps his legs locked.

We know that,

Force=\frac{\Delta(mv)}{t}

Naturally, the person who bends his legs will experience lesser force since t is larger.

3 0
3 years ago
1.2 Define the following terms and in each case give the symbol and the unit: 1.2.1 wavelength (4) ·​
Alex777 [14]
  • Wavelength is represented by lambda(\lambda)

\\ \bull\tt\longmapsto \lambda=\dfrac{c}{v}

  • C is speed of light in air.
  • v is the frequency.

It has unit as meter(m)

8 0
3 years ago
Which is the answer for this question
Brut [27]

Explanation:

Light is not invisible

sound cant travel in a vacuum

3 0
2 years ago
Read 2 more answers
Sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motionstays in motion with the sam
Lera25 [3.4K]

Answer:

D

Explanation:

Newtons first law states that if an object is at rest it will stay at rest only if an unbalanced force acts on it. As well as if an object is in motion it will stay in motion unless an unbalanced force acts on it.

Ps- The object will stay moving in the same speed and direction.

5 0
2 years ago
Other questions:
  • Determine the direction of the force (if any) that will act on the charge in each of the following situations. A positive charge
    12·1 answer
  • When light enters a piece of glass from air with an angle of θ with respect to the normal to the boundary surface?
    5·1 answer
  • Which atomic model was proposed as a result of j. J. Thomson’s work?
    13·1 answer
  • What is the momentum of a 200 kg car traveling 30 m/s to the right?
    9·1 answer
  • Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acc
    13·1 answer
  • 1. What is the average speed of a racecar that travels a distance of 230 miles in 2 hours?
    10·1 answer
  • A weightlifter lifts a set of 1250kg weights a vertical distance of 2m weight lifting contest. what potential energy do the weig
    12·1 answer
  • In a hydroelectric dam the potential energy of lake water is transformed into _ energy as it begins to more.
    6·2 answers
  • What is the frequency of a wave travelling at 45.45 m/s with a wavelength of 2 m?
    6·1 answer
  • Why is it that when riding in a car, you don't feel like you're moving?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!