An electric winch uses 3.78x10^4 J of electrical energy to pull a boat on a boat trailer up a ramp out of a lake. If the total mass of the boat and trailer is 635 kg, and the winch pulls them a vertical distance of 3.2 m, what is the efficiency of the winch in lifting the boat and trailer? *

2.which choice most accurately explains what happens to the bonds between atoms when water changes to steam, and what becomes of the energy added during this phase change? when water changes to steam bonds between molecules are created. after reaching the boiling point, energy is used to change bond strength and change the kinetic energy of the atoms. when water changes to steam bonds between molecules break apart. after reaching the boiling point, energy is used to break bonds, but does not affect the kinetic energy of the atoms. when water changes to steam bonds between molecules are created. after reaching the boiling point, energy is used to break bonds, but does not affect the kinetic energy of the atoms. when water changes to steam bonds between molecules break apart. after reaching the boiling point, energy is used to change bond strength and change the kinetic energy of the atoms.