A piston–cylinder assembly contains 0.5 lb of air at a pressure of 30 lbf/in^2 a

Question

A piston–cylinder assembly contains 0.5 lb of air at a pressure of 30 lbf/in^2 and a temperature of 400F. The air is heated at constant pressure until its volume is doubled. Assume the ideal gas model with constant specific heat ratio, k = 1.4.

Determine the work and heat transfer, in Btu.

Question A: The gas constant R for this problem is equal to:

Option A: the ratio of specific heats divided by the molecular weight of air.

Option B: the ratio of specific heats times the universal gas constant.

Option C: the universal gas constant.

Option D: the universal gas constant divided by the molecular weight of air.

Question B: Determine the work, in Btu.

Option A: 29.5

Option B: 2.29x10^4

Option C: 13.7

Option D: 182

Question C: Determine the heat transfer, in Btu.

Option A: 103

Option B: 8.02x10^4

Option C: 133

Option D: 48.0

Explanation / Answer

Question A. : option D : the universal gas constant divided by the molecular weight of air.

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