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College Physics

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

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Section
BuyFindarrow_forward

College Physics

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

A monatomic ideal gas under-goes the thermodynamic process shown in the PV diagram of Figure P12.20. Determine whether each of the values ΔU, Q, and W for the gas is positive, negative, or zero. Hint: The internal energy of a monatomic ideal gas at pressure P and occupying volume V is given by U = 3 2 PV.

images

Figure P12.20

(a)

To determine
the work done on the gas.

Explanation

Given Info:

Initial volume of the gas is 2V0

Final volume of the gas is V0

Initial pressure of the gas is P0

Finial pressure of the gas is 2P0

The PV diagram of the gas is,

The area under the path on a PV diagram is equal to the magnitude of the work done on the gas.

Formula to calculate the area under PV diagram is,

A=(W1×H1)+12(B1×H2)

  • W1 is the width of the rectangle A.
  • H1 is the height of the rectangle A.
  • B1 is the base of triangle B.
  • H2 is the height of triangle B

(b)

To determine
To determine the change in internal energy of the ideal gas.

(c)

To determine
The energy (Q) in the process.

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