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Properties of Field Lines

The gas is co...

Question

The gas is cooled such that it loses 65 J of heat.The gas contracts as it cools and work done on the system equal to 20 J is exchanged with the surroundings.What are q,w,and $Δ E$ ?

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Solution

Heat released has negative sign. Thus, $q = - 65 J$ . The work done on the system has positive sign. So, $W = + 20 J$
now, $Δ E = q + w = - 65 J + 20 J = - 45 J$

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