Chapter 21: Q. 66 (page 598)

In Problems $65$ through $68$ you are given the equation(s) used to solve a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
$4.0 = Q_{C} / W_{in}$
$Q_{H} = 100 J$

Short Answer

Expert verified

a. The coefficient is $4.0$ and heat is $100 J$ .Work done is needed.

b. The value of work done $20 J$ .

Step by step solution

Explanation (part a)

"The environment received $100 J$ of heat from a refrigerator with a performance coefficient of $4.0$ .

Look for the work that has been done to the system."

Problem with solution (part b)

The relationship between work and heat emitted from the cold reservoir can be established using the first supplied equation as follows:

$4.0 = \frac{Q_{c}}{W_{in}}$

$\Rightarrow Q_{c} = 4 W_{in}$

We have come a long way since the first refrigerator law was enacted.

$Q_{h} = W_{in} + Q_{c}$

$= W_{in} + 4 W_{in}$

$= 5 W_{in}$

The work input is,

role="math" localid="1650280024693" $W_{in} = \frac{Q_{h}}{5}$

role="math" localid="1650280033690" $= \frac{100 J}{5}$

$= 20 J$

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In Problems $65$ through $68$ you are given the equation(s) used to solve a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
$4.0 = Q_{C} / W_{in}$
$Q_{H} = 100 J$

Short Answer

Step by step solution

Explanation (part a)

Problem with solution (part b)

One App. One Place for Learning.

Most popular questions from this chapter

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In Problems 65through 68you are given the equation(s) used to solve a problem. For each of these, you are toa. Write a realistic problem for which this is the correct equation(s).b. Finish the solution of the problem.4.0=QC/WinQH=100J

Short Answer

Step by step solution

Explanation (part a)

Problem with solution (part b)

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Medical Physics

Astrophysics

Mechanics and Materials

Modern Physics

Particle Model of Matter

Engineering Physics

Study anywhere. Anytime. Across all devices.

In Problems $65$ through $68$ you are given the equation(s) used to solve a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
$4.0 = Q_{C} / W_{in}$
$Q_{H} = 100 J$