Question

a balloon is fitted over an open end of a glass beaker that contains water. the beaker is placed over a flame, which heats the water. at the same time the balloon is squeezed so that it deflates. what are the correct signs for the heat and work changes to beaker and balloon system?

Answer 1

The following is true regarding sign of heat and work.

Heat absorbed by the system has positive sign. Heat released to the surrounding has negative sign. Work done on the system has positive sign. Work done by the system has negative sign.

Therefore

The answer would be

C. +q, +w