Consider two planets of mass m and 2 m, respectively, orbiting the same star in circular orbits. The more massive planet is 4.2 times as far from the star as the less massive one. What is the ratio F1 : F2 of the gravitational forces exerted on the star by the two planets

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.