The Sputnik 1 satellite orbited Earth (mass = 5.98 x 10^24 kg) in a circle of
radius 6.96 x 106 m. What was its
period of orbit in seconds?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up