To demonstrate an elastic collision, a teacher places a tennis ball on the floor. she wants to hit the ball so that the following conditions are satisfied. 1. after collision, the tennis ball should roll with the velocity of the ball that hit it 2. at the instant of collision, the ball that hit the tennis ball should stop. what ball should she use? golf ball, tennis ball, basketball, or bowling ball?

Asatellite that goes around the earth once every 24 hours iscalled a geosynchronous satellite. if a geosynchronoussatellite is in an equatorial orbit, its position appearsstationary with respect to a ground station, and it is known as ageostationary satellite find the radius rof the orbit of a geosynchronous satellite that circles the earth.(note that ris measured from the center of the earth, not the surface.) you mayuse the following constants: the universal gravitational constant g is 6.67 \times 10^{-11}\; {\rm n \; m^2 / kg^2}. the mass of the earth is 5.98 \times 10^{24}\; {\rm kg}. the radius of the earth is 6.38 \times 10^{6}\; {\rm m}.