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A child twirls a 0.18 kg mass attached to the end of a 47 cm long...

A child twirls a 0.18 kg mass attached to the end of a 47 cm long piece of string. He twirls the mass around at 2.4 revolutions per second in a vertical plane. Calculate the tension (in N) in the string when the mass is at the bottom of the circle.

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Answer #1

tension at botom pointv

T = m r w^2 + mg

T = 0.18* 0.47* (2.4*2*3.14)^2 + 0.18*9.8

T = 20.982 N

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Comment in case any doubt, will reply for sure.. Goodluck

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