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Suppose that water drops are released from a point at the edge of a roof with a constant time interval `Deltat` between one water drop and the next. The drops fall a distance h to the ground. If `Deltat` is very short ie the number of drops falling through the air at any given instant is very large then the CM of the drops is very nearly at a height (above the ground ) ofA. `h//2`B. `h//3`C. `2h//3`D. `3h//4` |
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Answer» Correct Answer - C The droplets fall a distance `(1)/(2)g t^(2)` in time t, and the number of the droplets and hence their mass is proportional to `dt`. Computing the CM of the droplets using the definition, we get the result. |
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