A5.00 kg mass is attached to a spring on a horizontal frictionless surface. the elastic constant of the spring is 37.9 n/m. if the mass is 39.0 cm right of the equilibrium point and moving at speed 7.4 m/s, find the total mechanical energy

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

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.