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Question 2 15 pts Air in a piston/cylinder goes through a Carnot cycle with the P-v diagram shown in the figure. The high and low temperatures are 381 C and 22 C, respectively. The heat added at the high temperature is 250 kJ/kg, and the lowest pressure in the cycle is 72 kPa (P3). Determine: 1. the efficiency of the cycle (Give your answer to 2 dp) 2. the specific volume at the end of the heat rejection process, V4 (Give your answer to 3 dp) [use R =0.287 kJ/kg K] P 1. the efficiency of the cycle (Give your answer to 2 dp) 2. the specific volume at the end of the heat rejection process, V4 Give your answer to 3 dp) [use R =0.287 kJ/kg K] P 2. TH 3 TL Ideal gas