A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero? Mass of the sun , mass of the earth x . Neglect the effect of other planets etc. (orbital radius ).

Mass of Sun is given as

Mass of Earth is given as

Orbital radius is given as

Let m be the mass of the rocket

Let P denote the location at which the gravitational pull on the rocket owing to Earth is greatest at a distance .

The gravitational force exerted on the rocket at point P is equivalent using Newton’s law of gravitation.