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Q.

A child of mass 5 kg is going round a merry-go-round that makes 1 rotation in 3.14 s. The radius of the merry-go-round is 2 m . The centrifugal force on the child will be

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a

80 N

b

40 N

c

50 N

d

100 N

answer is A.

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Detailed Solution

detailed_solution_thumbnail

m = 5kg 
R = 2m
T = 3.14 sec

F=mRω2F=mR2πT2
F=10×4×(3.14)2(3.14)2→F=40N

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A child of mass 5 kg is going round a merry-go-round that makes 1 rotation in 3.14 s. The radius of the merry-go-round is 2 m . The centrifugal force on the child will be