(1) A small block with a mass of 0.09 kg is attached on a cord passing through a hole in a frictionless, horizontal surf

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1 A Small Block With A Mass Of 0 09 Kg Is Attached On A Cord Passing Through A Hole In A Frictionless Horizontal Surf 1 (20.9 KiB) Viewed 39 times

(1) A small block with a mass of 0.09 kg is attached on a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.4 m from the hole with a speed of 0.7 m/s. The cord is then pulled from below gradually, shortening the radius of the circle in which the block revolves to 0.1 m. At this new distance, the speed of the block is observed to be 2.8 m/s. (6 points) (a)The tension in the cord in the final situation is given by when the block has speed = 2.8m/s. (b) The work done by the person who pulled on the cord is given by