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A block of mass 0.120 kg is resting on a frictionless table. The block is attached...

A block of mass 0.120 kg is resting on a frictionless table. The block is attached to a string that is passed downward through a hole in the center of the table. The block is held by the string and placed in rotational motion at a distance of 40cm from the hole, with the tangential speed of 80cm/s. How much work is required to pull the string downward, through the hole in the table a distance of 15cm? Hint use conservation of angular momentum remember W=Delta K

Answer: 0.06 J (let me know how to get this answer)

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Answer #1

Use conservation of angular momentum to find the speed after the string is pulled downward. Use the initial and final speed to find the change in kinetic energy which will be the work done.

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