You push a ball to start rolling it across a frictionless surface how far will the ball roll ?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

Convection occurs when thermal energy is transferred by the movement of