InterviewSolution
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InterviewSolution
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The upper half of an inclined plane with inclination `phi` is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given byA. (a) `2 cos phi`B. (b) `2 sin phi`C. (c) `tan phi`D. (d) `2 tan phi` |
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Answer» Correct Answer - D According to work-energy theorem, `W=DeltaK=0` (Since initial and final speeds are zero) `:.` Work done by friction + Work done by gravity =0 i.e., `-(mu mg cos phi)l/2+mg l sin phi =0` or `mu/2 cos phi = sin phi` or `mu=2 tan phi` |
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