Athin hoop of mass m and radius r rolls without slipping down a ramp with height h. it then rolls onto a flat frictionless surface (where it can slip) and impacts a spring with spring constant k. assuming there is no friction between the hoop and the spring, what is the maximum compression of the spring?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

The energy equivalent of the rest mass of an electron is

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions