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Science · Physics
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kg is attached to a cord passing through a hole in a horizontal frictionless surface as shown in the A small block with a mass of 0.105 figure below. The block is originally revolving at a distance of 0.31 m from the hole with a speed of 0.61 m/s. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.10 m. At this new distance the speed of the block is observed to be 2.80 m/s. (a) Wi is the tension in the cord in the original situation when the block has speed v 0.61 m/s hat (b) W is the tension in the cord in the final situation when the block has speed v 2.80 m/s? hat (c) How much work was done by the person who pulled on the cord?

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