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Kepler's Law

When a satell...

Question

When a satellite in a circular orbit around the earth enters the atmospheric region, it encounters small air resistance to its motion. Then -

A

Its kinetic energy remains constant

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B

Its kinetic energy decreases

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C

Its angular momentum about the earth decreases

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D

Its period of revolution around the earth increases

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Solution

The correct option is C
Its angular momentum about the earth decreases

Due to air resistance satellite will experience tangential force due to which it will not remain in its orbit and approach towards earth hence r decrease and v increases. Thus KE increase. Due to tangential force angular momentum decreases

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