Which action best demonstrates the transformation of mechanical energy to heat energy? digesting a meal
burning a candle
rubbing hands vigorously
melting a piece of ice in sunlight

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?

An impulse is the product of the on an object and time during which it is applied

What would occur if the index of refraction of a material was less than n=1? the speed of light would increase to a speed larger than the maximum speed of light in a vacuum. the light wave would not bend at all though the material. the light wave would not be able to refract and would instead reflect off of the material. the speed of light would reduce to values close to 0 m/s.