In reducing the volume of a gas, 10 J of work is done on the gas and 40 Joules o

Question

In reducing the volume of a gas, 10 J of work is done on the gas and 40 Joules of heat are removed. By how much has its internal energy been changed?
A. 0 J B. +10 J C. -10 J D. +30 J E. -30 J


If a gas in a container absorbs 275 Joules of heat, has 125 Joules of work done on it, and then does 50 Joules of work on its surroundings, what is the increase in the internal energy of the gas?
A. 100 J B. 200 J C. 350 J D. 400 J E. 450 J

The thermodynamic efficiency of an ideal-gas Carnot engine which rejects heat to a sink at 15?C is 30 percent. What is the temperature of the source?



please explain with lots of details!!!!!!!!

Explanation / Answer

q =U +w

or, -40 = U -10

or, U = -30 J

w = -125 + 50 = -75J

q =U +w

or, 275 = U -75

or,U = 350J

efficiency = Tsource - Tsink / Tsource

Tsink = 273+15 = 288K

or, Tsource = 411.42 K

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