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The moment of inertia of a body about a given axis is `1.2 kg m^(2)`. Initially, the body is at rest. In order to produce a rotational `KE` of `1500 j`, for how much duration, an acceleration of `25 rad s^(-2)` must be applied about that axis ?A. `4 sec`B. `2 sec`C. `8 sec`D. `10 sec` |
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Answer» Correct Answer - B `(1)/(2) xx 1.2 w^(2) = 1500` `omega^(2) = (30000)/(1.2)` `omega = 50` `omega = "at" rArr t = 2 sec`. |
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