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

Question

A massive piston traps a fixed amount of helium gas as shown. After being brought to point (a) the system equilibrates to room temperature. Weight is then added to the piston slowly so that the system remains at room temperature. Eventually, the gas is compressed to half of its original volume (b).

1.The temperature Tb _________________ Ta.

2.The internal energy Ub __________________ Ua.

3.The entropy of the gas at "b" is __________________ the entropy of the gas at "a".

4.The pressure Pb _________________ Pa.

Less than, Greater than, or Equal to

Explanation / Answer

1) we are told that Tb = Ta so equals 2) If Ts equal, U equals 3) dS = dQ/T so lesser than 4) PV = nRT so if T the same and V halves P doubles so Pb greater than Pa

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