If the escape velocity on earth is $11.2 \mathrm{~km} / \mathrm{s}$, its value for a planet having double the radius and 8 time the mass of earth is

The long range force experienced by a neutral particle with a finite mass

If the radius of the earth shrinks by $1 \%$, its mass remaining the same, then the acceleration due to gravity on the earth surface would

A planet is moving in an elliptical orbit around the sun. The work done on the planet by the gravitational force of the sun

(i) is zero in no part of the motion.

(ii) is zero in some parts of the orbit.

(iii) is zero in one complete revolution.

(iv) is zero in any small part of the orbit.

Which of the following is true?