G L Mittal and TARUN MITTAL Solutions for Chapter: Gravitation : Planets and Satellites, Exercise 3: FOR DIFFERENT COMPETITIVE EXAMINATIONS

A missile is launched with a velocity less than the escape velocity. The sum of kinetic energy and potential energy is :

The orbital speed of Jupiter is _____.

A bomb explodes on the moon. You will hear its sound on earth after:

There is no atmosphere on the moon because :

A bottle filled with water at ${30}^{\circ }\mathrm{C}$ and fitted with a cork is taken to the moon. If the cork is opened at the surface of the moon then :

The tail of the comet Halley is directly away from the sun because :

A satellite is moving with a constant speed ${\mathrm{v}}_o$  in a circular orbit about the earth. An object of mass $\mathrm{m}$ is ejected from the satellite such that it just escapes from the gravitational pull of the earth. At the time of its ejection, the kinetic energy of the object is :

Two bodies of masses $\mathrm{m} \mathrm{and} 4\mathrm{m}$ are placed at a distance $\mathrm{r}.$ The gravitational potential at a point on the line joining them where the gravitational field is zero is :