11.A satellite revolving around the Earth loses some energy due to collision. What would be the effect on its velocity and distance from the centre of the Earth ?

12.If the distance between the Earth and the Sun becomes half its present value, the number of days in a year would have been

13.Mass remaining constant, the radius of the Earth shrinks by 1% .The acceleration due to gravity on the earths surface would

14.A planet has radius and mass, both half of those of the earth, then the value of g on that planet will be:

15.In case of earth: