16.A body is orbiting around the Earth at a mean radius 16 times as great as the parking orbit of a satellite. The period of the body is

17.In order to shift a body of mass m from a circular orbit of radius 3R to a orbit of radius 5R around the Earth, the work done is

18.The K.E. of a satellite is 2 MJ. What is the total energy of the satellite ?

19.Suppose Earth s orbit motion around the Sun is suddenly stopped. What time the Earth shall take to fall into the Sun ?

20.Radius of the Earth is 6000 km. Weight of a body on the surface of Earth is 120 kg wt. If it is taken to a height of 2000 km above the surface of Earth, its weight is