A small block on a frictionless horizontal surface has a mass of 2.55 A small bl

Question

A small block on a frictionless horizontal surface has a mass of 2.55

A small block on a frictionless horizontal surface has a mass of 2.55 times 10?2kg . It is attached to a massless cord passing through a hole in the surface. (See the figure below (Figure 1) .) The block is originally revolving at a distance of 0.305m from the hole with an angular speed of 1.80rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.155m . You may treat the block as a particle. Is angular momentum conserved?

Explanation / Answer

Part A: Yes

Part B: 6.97 rad/s

Part C: 0.011 J

Part D: 0.011 J

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