A body of mass 2kg attached at one end of light string is rotated along a vertical circle of radius 2m. If the string can withstand a maximum tension of 140.6N, the maximum speed with which the stone can be rotated is:
22m/s
44m/s
33m/s
11m/s
A
11m/s
B
22m/s
C
44m/s
D
33m/s
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Solution
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m=2KgR=2m Tmax=1406N The tension is max at bottom point. At bottom:
T−mg=mv2R
2(140.6−2X9.81)2=V2
V=10.99m/s
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