A skier of mass 65 kg skis down a ski slope inclined at 30° to the horizontal, of length 100 m . The force of friction between the skis and the slope is 120 N. Calculate the net work done on the skier.​

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

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.

How do you count the total number of atoms present on one side of a chemical equation?