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qUESTIONS

The velocity with which a projectile must be fired so that it escapes earth’s gravitation does not depend on

The escape velocity from the earth is about 11 km/second. The escape velocity from a planet having twice the radius and the same mean density as the earth, is

The mass and diameter of a planet are twice those of earth. The period of oscillation of pendulum on this planet will be (if it is a second’s pendulum on earth)

An asteroid of mass m is approaching earth, initially at a distance of 10 Re with speed vi It hits the earth with a speed vf (Re and Me are radius and mass of earth), then

Kepler’s second law regarding constancy of aerial velocity of a planet is a consequence of the law of conservation of

If the distance between two masses is doubled, the gravitational attraction between them

Reason of weightlessness in a satellite is

Three identical bodies of mass M are located at the vertices of an equilateral triangle of side L. They revolve under the effect of mutual gravitational force in a circular orbit, circumscribing the triangle while preserving the equilateral triangle. Their orbital velocity is

A cosmonaut is circling the earth in a satellite at 7 km/s at a height of 630 km above the surface of earth. Calculate the centripetal force acting on the cosmonaut if his mass is 80 kg (Take RE = 6.37×10^6 m)

Two satellites of masses m₁ and m₂(m₁ > m₂) are revolving round the earth in circular orbits of radius r1 and r2 (r1 > r2) respectively. Which of the following statements is true regarding their speeds v₁ and v2

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