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The earth rotates about the sun in an elliptical orbit. At which point will its velocity be maximum?
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Important Questions on Gravitation

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Satellite revolving around the earth loses some energy due to collision. What would be the effect on its velocity and distance from the centre of the earth?
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B.E. of a satellite is always
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Assertion: A body weighs X newton on the surface of the earth. Its weight at a height equal to half the radius of the earth will be 2X5.

Reason: g'=gR2R+h2.

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A body weighs 81 N on the surface of the earth. What is the gravitational force on it due to earth at a height equal to half the radius of the earth from the surface?
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The gravitational force between two spheres of masses m and M situated in the air is F. Now the space around the masses is filled with a liquid of specific gravity 3. What will be the gravitational force now?

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Newton's law of gravitation is universal because
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The tidal waves in the sea are primarily due to
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Assertion: The artificial satellite does not have any fuel but even then it remains orbiting around the earth.

Reason: The necessary centripetal force required to move the satellite in an orbit around the earth is provided by the gravitational force of attraction between the satellite and the earth.