Q16 of 81 Page 224

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

To project the object, the kinetic energy(KE) of the system should be equal to its potential energy(PE). Let the velocity be .




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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.

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

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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

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Let V and E denote the gravitational potential and gravitational field at a point. It is possible to have