InterviewSolution
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InterviewSolution
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A satellite is orbiting around the earth in an orbitin equatorial plane of radius `2R_(e)` where `R_(e)` is the radius of earth. Find the area on earth, this satellite covers for communication purpose in its complete revolution.A. `sqrt(3) piR_(e)^(2)`B. `2R_(e)^(2)`C. `2sqrt(3)piR_(e)^(2)`D. `sqrt(2)piR_(e)^(2)` |
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Answer» Correct Answer - C Gravitational potential , `V=(-GM)/r(rgtR)` `V=(-GM(3R^(2)-r^(2)))/(2R^(3))(rltR)` Potential energy, `U=(-GMm)/r(rgtR)` `U=(-GMm(3R^(2)-r^(2)))/(2R^(3))(rltR)` `KE="Loss of "PE=O-U` `KE=U` `:. KE` will very with `r` exactly as that of `V` with sign changed. |
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