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Physics / Physics with MasteringPhysics 4 / Chapter 18 / Problem 100IP

Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker

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· · IP Referring to Active Example 18–3 Suppose we lower

Chapter 18, Problem 100IP

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QUESTION:

Problem 100IP

· · IP Referring to Active Example 18–3 Suppose we lower the temperature of the cold reservoir to 295 K; the temperature of the hot reservoir is still 576 K. (a) Is the new efficiency of the engine greater than, less than, or equal to 0.470? Explain. (b) What is the new efficiency? (c) Find the work done by this engine when 1050 J of heat is drawn from the hot reservoir.

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QUESTION:

Problem 100IP

· · IP Referring to Active Example 18–3 Suppose we lower the temperature of the cold reservoir to 295 K; the temperature of the hot reservoir is still 576 K. (a) Is the new efficiency of the engine greater than, less than, or equal to 0.470? Explain. (b) What is the new efficiency? (c) Find the work done by this engine when 1050 J of heat is drawn from the hot reservoir.

ANSWER:

Solution 100IP

Step 1 of 3

To calculate the change in efficiency and the work done.

The equation for the efficiency of a heat engine

Where, - Temperature cold reservoir

- Temperature of hot reservoir

a)

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