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Question
A satellite revolves around a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason.
Give Reasons
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Solution
The work done is zero.
Reason: The gravitational force on the satellite acts towards the centre of the circular orbit, while its instantaneous displacement is tangential to the orbit. Since force and displacement are perpendicular,
W = F s cos 90° = 0
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