21.Orbital velocity of satellite revolving in a circular path close to the planet

22.If radius of Earth is 4000 miles, then the linear velocity of a body at the equator is nearly

23.The distance of two satellites P and Q from Earth are in the ratio 3 : 1. The ratio of their total energy will be

24.If the mass of a planet is 10% less than that of the Earth and the radius 20% greater than that of the Earth, the acceleration due to gravity on the planet will be

25.The radius of the earth shrinks by 1%. The acceleration due to gravity on the earths surface would: (mass remaining constant)