Planet mass m revolving around sun. Force F. Speed?

The masses of two planets are in the ratio of 1:7. The ratio between their diameters is 2:1 The ratio of forces which they exert on each other is

Satellite is kept moving in its orbit around the Earth; it is due to –

What happens to the gravitational force between two objects if the mass of one object is doubled and the distance between them is also doubled?

The earth's part responsible for causing earthquakes is :

If the distance between the Earth and the Sun were twice what it is now, the gravitational force exerted on the Earth by the Sun would be –