For the following processes carried out on an ideal gas, determine whether the a

Question

For the following processes carried out on an ideal gas, determine whether the associated work is positive, negative, or zero Briefly explain your reasoning. (a) A gas (the system) in a rigid container is placed in a refrigerator and cooled. (b) A gas (the system) is left out in the sun, heats up. and expands its container. (C) A gas is stirred by a paddle driven by an external motor (the gas and paddle are the system). (d) A gas (the system) contained in a balloon is placed in an evacuated chamber and the balloon is popped. (e) A gas in a rigid container has a resistor filament inside connected to an external circuit. An electrical current is passed through the resistor filament. (The gas and the filament are the system.)

Explanation / Answer

a) w = -p(v2-v1), there is compression ,v1<v2 ,W=+VE

b) W =-P(V2-V1) = .HERE THERE IS A EXPANSION . V2>V1   W= -VE(NEGATIVE)

C) w = -p(v2-v1) , there is no expansion or compression ,v1=v2 ,W=0

D) w = -p(v2-v1)   ,HERE EXTERNAL PRESSURE (P) =0 ,W=0

E) W= -VE

      

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