Gravitation Tes...

A man weighs $$80 kg$$ on the surface of earth of radius $$R$$. At what height above the surface of earth his weight will be $$40 kg$$?

Let $$V$$ and $$E$$ denote the gravitational potential and gravitational field at a point. It is possible to have

The escape velocity of a projectile from the earth is approximately

The escape velocity of an object projected from the surface of a given planet is independent of

There is no atmosphere on the moon because.

The weight of an object in the coal mine, sea level and at the top of the mountain, are respectively $$W_1$$, $$W_2$$ and $$W_3$$ then

If $$g$$ is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass $$m$$ raised from the surface of the earth to a height equal to the radius $$R$$ of the earth is

The weight of a body at the centre of the earth is

The largest and the shortest distance of the earth from the sun is $$r_1$$ and $$r_2$$. Its distance from the sun when it is at perpendicular to the major axis of the orbit drawn from the sun:

Taking the gravitational potential at a point infinte distance away as zero, the gravitational potential at a point $$A$$ is $$-5$$ unit. If the gravitational potential at a point infinite distance away is taken as $$+10$$ units, the potential at a point $$A$$ is