Which of the following statements is (are) true?
a) When a system does work, its internal energy always decreases.
b) Work done on a system always decreases its internal energy.
c) When a system does work on its surroundings, the sign of the work is always positive.
d) Positive work done on a system is always equal to the system's gain in internal energy.
e) If you push on the piston of a gas-filled cylinder, the energy of the gas in the cylinder will increase.
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