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A body of mass 400g is whirled in a vertical of radius 2m at a steady rate of 2rev/s.find it's centripetal force

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4 pi radians/s = omega
Ac = R omega^2
Ac = 2 (16 pi^2) = 32 pi^3
m Ac =0.400 * 32 * pi^2 Newtons

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