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Q.

A 1kg ball is rotated in a vertical circle by using a string of length 0.1 m. If the tension in the string at the lowest point is 29.4N, its angular velocity at that position is

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a

7 rads-1

b

14 rads-1

c

3.5 rads-1

d

25.6 rads-1

answer is B.

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Detailed Solution

T=mg+mrω2
29.4=1×9.8+1×0.1×ω2

ω= 14 rad/s

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A 1kg ball is rotated in a vertical circle by using a string of length 0.1 m. If the tension in the string at the lowest point is 29.4N, its angular velocity at that position is