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Practice Worksheet WITH answers part 2

Practice Worksheet WITH answers part 2 - An ideal gas in a...

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An ideal gas in a cylinder is compressed by a piston, heated, and cooled so that it undergoes the cycle shown at right. The characteristics of the cycle P are given below: a d Amount of gas: n = 0.5 mol Peak pressure P a = P d = 3.0 x 10 5 N /m 2 b c Minimum pressure P b = P c = 2.0 x 10 5 N/m 2 Minimum volume V a = V b = 0.005 m 3 V Maximum volume V c = V d = 0.010 m 3 28) What is the temperature of the gas at each of the points a , b , c , and d ? Answer: T a = 361 K; T b =241 K; T c = 481 K; T d = 722 K 29) Determine each of the following for the process a - b : a) the work done by the gas. Answer: zero d) the change in the internal energy of the gas. Answer: -748 J e) the amount of heat that enters the gas. Answer: -748 J 30) Determine each of the following for the process b - c : a) the work done by the gas. Answer: 1000 J b) the change in the internal energy of the gas. Answer: 1497 J c) the amount of heat that enters the gas. Answer: 2497 J 31) Determine each of the following for the process c - d : a) the work done by the gas. Answer: zero b) the change in the internal energy of the gas. Answer: 1503 J
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