When heat is absorbed by the system and work is done by the system on the surroundings then
A)q is negative and w is positive.
B)both q and w are positive.
C)both q and w are negative.
D)q is positive and w is negative.
E)both q and W are zero.

Question

Quizplus · Accepted Answer

According to the first law of thermodynamics, the change in internal energy of a system is equal to the heat absorbed by the system minus the work done by the system on the surroundings: ΔU = q - w. If heat is absorbed by the system (q is positive) and work is done by the system on the surroundings (w is negative), then the internal energy of the system increases (ΔU is positive). Therefore, to satisfy the first law, q must be positive and w must be negative, which is represented by choice D.

When Heat Is Absorbed by the System and Work Is