A small block with a mass of 0.0600 kg
is attached to a cord passing through a hole in a frictionless, horizontal surface
. The block is originally revolving at a distance of
from the hole with a speed of
0.71 m/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to
0.15 m . At this new distance, the speed of the block is
1.94 m/s .
What is the tension in the cord in the original situation when the block has speed
= 0.71 m/s ?
What is the tension in the cord in the final situation when the block has speed
= 1.94 m/s ?
How much work was done by the person who pulled on the cord?