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Assume that the law of gravitiontion cha...

Assume that the law of gravitiontion changes from inverse square to inverse cube. Does the angular momentum of a planet about the sun will remain constant?

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The torque on a planet is zero. The angular momentum of planet remains constant as long as torque remains zero.
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  15. What did Galileo discover regarding gravitation?

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  18. Why does the gravitational potential energy U(r) is always negative?

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  19. What is 'retrograde motion' of planets?

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