A small block on a frictionless, horizontal surface has a mass of 2.50×10−2 kg. It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.51 rad/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. What is the new angular speed? Find the change in kinetic energy of the block. How much work was done in pulling the cord?

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