A6 kilogram cat is resting on top of a bookshelf that is 1 meters high. what is the cat’s gravitational potential energy relative to the floor?

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

1. do the particles in the medium material move in the same direction of the wave or at opposite direction to the wave? explain your answer. 2. by inputting more energy into the wave, i.e a large shake of the spring, which wave property also increases? 3. are there forces of friction acting while a wave is passing through a medium?

In an exothermic chemical reaction the energy gained by the surroundings must be the energy lost by the reaction