A massive weighted piston traps a fixed amount of helium gas. After being brough

Question

A massive weighted piston traps a fixed amount of helium gas. After being brought to point (a) the system equilibrates at room temperature. Weight is then removed from the piston, adiabatically expanding the gas to twice its original volume (b). The internal energy of the gas at "b" is __________ the internal energy of the gas at "a".

Taking the heat intake of the gas to be positive if heat flows into the gas, the heat intake of the gas in going from "a" to "b" is __________ than zero.

Greater than, less than, equal to. PICK ONE for BOTH

Explanation / Answer

1) is greater than
2) is equal to (it's in the question)
3) Is less than (energy is lost to the surroundings as the piston compresses the gas at a constant temperature)
4) If the temperature is the same then so will the pressure- pressure is caused by the movement of molucules as they bounce about due to their temperature- so is equal to

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