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April 19, 2014

Homework Help: Physics

Posted by Christina on Wednesday, November 7, 2007 at 4:54pm.

A small block on a frictionless horizontal surface has a mass of 2.5010−2 Kg. It is attached to a massless cord passing through a hole in the surface. The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 1.75 rad/s. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. You may treat the block as a particle.

What is the new angular speed?

Find the change in kinetic energy of the block.

How much work was done in pulling the cord?

(I'm having problems setting up/figuring out which equations to use)

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