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A point mass of 0.05 kg at the end of a cord is rotated in a...

A point mass of 0.05 kg at the end of a cord is rotated in a horizontal circle of radius of 0.2 m with an angular velocity of 3 rad/s. The cord is shortened to 0.1 m. (a) Calculate the new angular velocity. (b) Find the change in kinetic energy of the mass. (c) How much work was required to shorten the cord?

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