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Q.

When the angular velocity of a uniformly rotating body has increased thrice, the resultant of forces applied to it increases by 60 N. Find the accelerations of the body in the two cases. The mass of the body m = 3 kg.

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a

2.5 ms-2,7.5 ms-2

b

7.5 ms-2,22.5 ms-2

c

5 ms-2,45 ms-2

d

2.5 ms-2,22.5 ms-2

answer is D.

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Detailed Solution

F1=M ω2R and F2 = M (3ω)2 Rgiven ∆F = 9F1-F1=60 NSO a1=F1M=2.5 ms-2 a2 = F2M=22.5 ms-2

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When the angular velocity of a uniformly rotating body has increased thrice, the resultant of forces applied to it increases by 60 N. Find the accelerations of the body in the two cases. The mass of the body m = 3 kg.