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A small block on a frictionless, horizontal surface has a mass of 2.90×10−2 kg . It...

A small block on a frictionless, horizontal surface has a mass of 2.90×10−2 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 2.53 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.

A. what is angular speed B. Find kinetic energy of the block C. How much work was done in pulling the cord.

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