HOT Que.Series 17Aug Physics Gravitaion

If the gravitational force between two objects were proportional to R1​ (and not as R21​) where $R$ is separation between them, then a particle in circular orbit under such a force would have its orbital speed $v$ proportional to

The period of a satellite in a circular orbit of radius R is T. The period of another satellite in circular orbit of radius 4R is

Fg​ and Fe​ represent gravitational and electrostatic force respectively between electrons situated at a distance 0.1m.Fg​/Fe​ is of the order

The value of g at a particular point is 9.8 m/sec2 suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of $g$ at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become

The mean radius of the earth is $R$, its angular speed about its own axis $\omega$ and the acceleration due to gravity at the earth surface is $g$. The cube of radius of orbit of ‘geostationary satellite’ will be

The largest and the shortest distance of the earth from the sun is r1​ and r2​. Its distance from the sun when it is at perpendicular to the major axis of the orbit drawn from the sun:

The density of newly discovered planet is twice that of the earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth is It the radius of the plane would be

Gravitational acceleration on the surface of a planet is 116​​g, where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is 32​ times that of the Earth. If the escape speed on the surface of the earth is taken to be $11$ kms−1, the escape speed on the surface of the planet is kms−1 will be?

A body weighs $160N$ on the earth. Find its weight on another planet whose mass is 41​th the mass of earth and radius 31​rd that of the earth.