In a hydraulic lift, the radius of the small and large pistons are 2.50cm and 10.0cm respectively. A vehicle weighing 12.0kN is to be
lifted by the large piston. Calculate
a) the force that must be applied to the small piston
b) the distance that the small piston has to be pushed down to raise the vehicle a diatance of 2.00cm

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Since the energy was not raising the temperature of the water during these segments, what was the energy used to do instead? your answer must include an explanation of what is happening to the molecules.

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?