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InterviewSolution
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Energy required in moving a body of mass `m` from a distance 2R to 3R from centre of earth of mass M isA. GMm/6RB. `GMm//12R^(2)`C. `GMm//8R`D. `GMm//3R^(2)` |
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Answer» Correct Answer - A P.E. of the body at a distance 2R from the centre of the earth `=-(GMm)/(2R)` and P.E. of the same body at a distance 3r from the centre of the earth `=-(GMm)/(3R)` `therefore` Increase in P.E. = Work done = Energy required `=(-(GMm)/(3R))-(-(GMm)/(2R))` `=(GMm)/(2R)-(GMm)/(3R)=(GMm)/(6R)` |
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