Consider the astronaut on the surface of Mars. They release a 0.06 kg tennis ball from rest and the tennis
ball accelerates down toward the surface of Mars. What
is the acceleration due to gravity that this tennis ball
would experience as it falls to the surface? Consider air
resistance to be negligible.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.