Question

A cylinder is in thermal equilibrium with the gas that it contains. The cylinder is then...

A cylinder is in thermal equilibrium with the gas that it contains. The cylinder is then placed in a water bath. If the temperature of the water is observed to increase, which of the following statements is correct regarding the gas and the cylinder?

  (A) Q<0 , W=0, and U<0

     (B) Q>0 , W<0, and U=0

     (C) Q<0 , W>0, and U=0

     (D) Q>0 , W=0, and U>0

     (E) Q=0 , W<0, and U<0

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Answer #1

Option (A) is correct, Because here heat is lost to the water   Q 0 ( negative i. e heat is decreasing )

*Volume of gas in cylinder remain constant

i. e V=0

W= 0

* since heat is released by cylinder so internal energy is decreasing U0

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