Q15 of 81 Page 224

The kinetic energy needed to project a body of mass m from the earth’s surface to infinity is

To project a body out of earth’s surface, the kinetic energy(KE) should be equal to the potential energy(PE) of the object (total energy E being zero).



More from this chapter

All 81 →
13

A person sitting in a chair in a satellite feels weightless because

 14

A body is suspended from a spring balance kept in a satellite. The reading of the balance is W1 when the satellite goes in an orbit of radius R and is W2 when it goes in an orbit of radius 2R.

 16

A particle is kept at rest at a distance R (earth’s radius) above the earth’s surface. The minimum speed with which it should be protected so that it does not return is

 17

A satellite is orbiting the earth close to the surface. A particle is to be projected from the satellite to just escape from the earth. The escape speed from the earth is