Which of the following signs on q and w represent a system that is doing work on

Question

Which of the following signs on q and w represent a system that is doing work on the surroundings, as well at losing heat to the surroundings? A. q = -, w = - B. q = +, w = + C. q = -, w = + D. q = +, w = -
Why is A correct and why are B, C, and D incorrect? Which of the following signs on q and w represent a system that is doing work on the surroundings, as well at losing heat to the surroundings? A. q = -, w = - B. q = +, w = + C. q = -, w = + D. q = +, w = -
Why is A correct and why are B, C, and D incorrect? A. q = -, w = - B. q = +, w = + C. q = -, w = + D. q = +, w = -
Why is A correct and why are B, C, and D incorrect?

Explanation / Answer

Ans work is done on the surrounding means energy leaves the system that is w(system) is -ve and this is the energy that do work on the surrounding. Hence w(surrounding) is also -ve.

It is given that the heat is lost to the surrounding that means q = -ve

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