1. Calculate the potential energy, kinetic energy, mechanical energy, velocity, and height of the ball at the locations (1), (2), (3), and (4). Show your work below then insert your answers in the blank space provided (PE = , KE = etc.). PE is potential energy, KE is kinetic energy, and ME is mechanical energy.

The intensity, or loudness, of a sound can be measured in decibels (db), according to the equation , where i is the intensity of a given sound and is the threshold of hearing intensity. what is the intensity, in decibels, [i(db)], when ? use a calculator. round to the nearest whole number. 8 9 19 80

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.