Q18 of 27 Page 66

Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it?

Moon will not have any centripetal acceleration acting on it. This centripetal acceleration is provided by the gravitational force of earth. Due to this force, the moon moves in a circular motion. So, it will be move in a straight line along tangential path to its orbit.


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16

What is the source of centripetal force that a planet requires to revolve around the Sun? On what factors does that force depend?

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