Question

A small block with a mass of 0.0600 kg is attached to a cord passing through a hole in a frictionless, horizontal surface (Figure 1). The block is originally revolving at a distance of 0.43 m from the hole with a speed of 0.75 m/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.19 m . At this new distance, the speed of the block is 1.70 m/s .

What is the tension in the cord in the original situation when the block has speed v0 = 0.75 m/s ?

What is the tension in the cord in the final situation when the block has speed v1 = 1.70 m/s ?

How much work was done by the person who pulled on the cord?

Step 1

The tension in the cord when the object is revolving in a circle of radius r with a speed v is equal to the centripetal force and is expressed as,

Step 2

The tension in the cord if the speed of the block is 0.75m/s can be calculated using equation 1.

Step 3

The tension in the cord if the speed of the block is...

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