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`        Suppose in gravity free space a disc of mass m0 rotates freely about a fixed horizontal axis through its centre. A thin cotton pad is fixed to its rim, which can absorb water. The mass of water dripping onto the pad is mu/2 kg per second. After what time will the angular velocity of the disc get reduced to half of its initial value?`
5 years ago

13 Points
```							By conservation of angular momentum, Omega/2((mu/2×t)R^2+(m0×R^2)/2)=(m0×R^2)/2×omegamu/2×t+m0/2=m0t=m0/mu.   seconds
```
7 months ago
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