- Problem 1 4 Points The Figure Below Shows A Pv Diagram For An Ideal Gas A Find The Work Done By And Ideal Gas As It 1 (79.25 KiB) Viewed 76 times
Problem 2 (3 points) In a car engine operating at 1.80 x 103 rev/min, the expansion of hot, high pressure gas in a cylinder against a piston occurs on a timescale of 10 ms. In contrast, energy transfer by heat takes minutes or hours. (a) Can we safely assume that virtually no heat energy leaves the hot gas during expansion? Which one of the four thermal processes can we use as an approximation for this situation? (b) Assume the cylinder contains 0.100 moles of an ideal monatomic gas that goes from 1.20 x 103 K to 4.00 x 102 K during the expansion. Calculate the work done by the gas on the piston.
Problem 3 (3 points) A balloon holding 4.20 moles of helium gas absorbs 905 J of thermal energy while doing 106 J of work expanding to a larger volume. (a) Find the change in the balloon's internal energy. (b) Calculate the change in temperature of the gas.
Problem 4 (3 points) A chemical reaction transfers 1120 J of thermal energy into an ideal gas while the system expands by 4.00 x 10-2 mº at a constant pressure of 1.65 x 105 Pa. Find the change in internal energy.
Problem 5 (2 points) A heat engine operates between a reservoir at 15°C and one at 220°C. What is the maximum efficiency possible for this engine? Do you think the engine likely to achieve this efficiency?