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A small block on a frictionless, horizontal surface has a mass of 2.70×10−2 kg . It...

A small block on a frictionless, horizontal surface has a mass of 2.70×10−2 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 2.33 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)Is angular momentum of the block conserved?

b)What is the new angular speed?

c)Find the change in kinetic energy of the block.

Express your answer with the appropriate units.

d)How much work was done in pulling the cord?

Express your answer with the appropriate units

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