A pendulum bob of mass 10g is attached to a rod of length 2m and is allowed to move in the vertical circle. Find the minimum velocity of bob at the bottom of the circle so that the bob completes the circle.
(Take g=10m/s2)
A
10m/s
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B
8.9m/s
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C
0.89m/s
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D
9m/s
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Solution
The correct option is B8.9m/s Applying energy conservation at the lowest point
12mv2=mg(2R)
v=√4gR, this is the critical velocity of the bob at the bottom most position for looping the loop