InterviewSolution
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InterviewSolution
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Initial angular velocity of a circular disc of mass `M` is `omega_(1)`. Then two small spheres of mass `m` are attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc -A. `((M +m)/(M)) omega_(1)`B. `((M +m)/(m)) omega_(1)`C. `((M )/(M + 4m)) omega_(1)`D. `((M )/(M + 2m)) omega_(1)` |
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Answer» Correct Answer - C Conservation of angular momentum gives `(1)/(2) MR^(2) omega_(1) = ((1)/(2) MR^(2) + 2 MR^(2)) omega_(2)` `rArr (1)/(2) MR^(2) omega_(1) = (1)/(2) R^(2) (M + 4m) omega_(2)` :. `omega` `= ((M)/(M + 4m)) omega_(1)`. |
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