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How much work has to be done to pull down the cord

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Reference no: EM131104154

A 4-lb ball B is traveling around in a circle of radius r1 = 3 ftwith a speed (vB)1 = 5.6ft/s . The attached cord is pulled down through the hole with a constant speed vr = 1.6ft/s .

Part A

Determine the ball's speed at the instant r2 = 2 ft. Neglect friction and the size of the ball.

Express your answer to three significant figures and include the appropriate units.

Part B

How much work has to be done to pull down the cord at the instant r2 = 2 ft? Neglect friction and the size of the ball.

Express your answer to three significant figures and include the appropriate units.

Reference no: EM131104154

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