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A boy twirls a 0. He twirls the mass around at 2.1 revolutions per second in a vertical plane.
A boy twirls a 0.16 kg mass attached to the end of a 23 cm long piece of string. He twirls the mass around at 2.1 revolutions per second in a vertical plane. Calculate the tension in the string when the mass is at the top of the circle