for every 100 joules or useful energy output, the heater wastes 100 joules, find the input energy of the heater.

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?