A phone takes in 10W of power and fully charges in 60 minutes. It outputs 2W of power and can continuously watch movies for 4 hours. What is the energy
efficiency of the phone? *

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.