Question: A small block on a frictionless, horizontal surface has a mass of 0.0250 kg. It is attached to a massless cord passing through a hole

A small block on a frictionless, horizontal surface has a mass of 0.0250 kg. It is attached to a massless cord passing through a hole in the surface (Fig. E10.42). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed 1.75 rad/s. of 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 the angular momentum of the block conserved? Why or why not?

(b) What is the new angular speed?

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

Figure E10.42:

A small block on a frictionless, horizontal surface has a

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