A communications satellite with a mass of 375 kg is in a circular orbit about the Earth. The radius of the orbit is 25,500 km as measured from the center of the Earth. (a) Calculate the weight of the satellite on the surface of the Earth. Calculate the gravitational force exerted on the satellite by the Earth when it is in orbit.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct