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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Consider the cyclic process described by Figure P12.28. If Q is negative for the process BC and ΔU is negative for the process CA, determine the signs of Q, W, and ΔU associated with each process.

images

Figure P12.28

(a)

To determine
The signs of Q, W and ΔU associated with the process BC

Explanation

Given Info:

The energy transferred as heat ( QBC ) is negative.

The volume is constant in the process BC,

Formula to calculate the work done of the gas is,

F=PΔV

  • P is the pressure of the gas
  • ΔV is the change in volume of the gas

Since, the volume is constant for the process BC; the work done on the gas (WBC) is zero.

From First law of thermodynamics,

ΔUBC=QBC+WBC <

(b)

To determine
The signs of Q, W and ΔU associated with the process CA

(c)

To determine
The signs of Q, W and ΔU associated with the process AB

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