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blueberryfive
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Homework Statement
One mole of an ideal gas is in a container with a moveable piston. A 100 N force moves the piston down 1 m; the compression is isothermal.
Does 100 J of energy leave the gas or enter the gas?
Homework Equations
W=Fd
U=Q-W=Q-P(Vf-Vi)
The Attempt at a Solution
W=P(Vf-Vi). Since Vf<Vi, Vf-Vi<0, so W<0. Hence U=Q-W=Q+W. Since the compression is isothermal, U=0, so 0=Q+W <=> Q=-W <=> Q=100 J. So 100 J of heat enters the gas.