A small block on a frictionless, horizontal surface has a mass of 2.80 times 10-

Question

A small block on a frictionless, horizontal surface has a mass of 2.80 times 10-2kg. It is attached to a massless cord passing through a hole in the surface the figure Figure 1 . The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 1.85rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle. Find the change in kinetic energy of the block. Part D How much work was done in pulling the cord?

Explanation / Answer

change in K.E= 0.5m(w2r2-w2r1)

                        =0.5* 2.8*10-2*1.852(0.3-0.150)2

                       =1.078*10-3

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