Gravitation Tes...

The energy required to remove a body of mass 'm' from earths surface is/are equal to:

 The escape velocity of projection from the earth is approximately ($$R = 6400 km$$).

The earth retains its atmosphere because

Two identical spherical masses are kept at some distance. Potential energy when a mass $$m$$ is taken from the surface of one sphere to the other

The weight of a body of mass $$3kg$$ at a height of $$12.8 \times 10^6m$$ from the surface of the earth is _______.

Gravitational potential energy is negative. This implies 

The weight of an astronaut in outer space is

The value of $$'g'$$ will be $$1$$% of its value at the surface of the earth at a height of $$(R_e = 6400km)$$ -

If $$R$$ is the radius of the earth, then the value of acceleration due to gravity at a height $$h$$ from the surface of the earth will become half its value on the surface of the earth if

If the distance between the earth and sun were to be doubled from its present value, the number of days in a year would be :