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1) What is the new angular speed?

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

3) How much work was done in pulling the cord? A small block on a frictionless, horizontal surface has a mass of 2.50x10-2kg .

It is attached to a massless cord passing through a hole in the surface (the figure ). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 1.65rad/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.

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  • Category:- Physics
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