A can filled with water is revolved in a vertical circle of radius 4 metre and the water just does not fall down. The time period of revolution will be
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a
1 sec
b
10 sec
c
8 sec
d
4 sec
answer is D.
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Detailed Solution
The speed at the highest point must bev≥rgNow v=rω=r(2π/T)∴ r(2π/T)≥rgor T≤2πrrg≤2πrg∴ Tmax=2π49⋅8=4sec