Question

Remove th refill from a ball point pen. Pass an about 1m long thin, strong cotton thread through the body of the pen. Tie a heavy washer A at the lower end and a comparatively lighter washer B at the upper end as shown in fig. The masses of washers must be precisely measured with the help of a physical balance. Mark a point on the thread at a distance of 20 cm below the lower edge of the body of the pen. Hold the pen vertically in your right hand and rotate the washer B till it moves on a circular path in horizontal plane with constant speed. You will find that the washer A moves up. Increase the speed of rotation till the mark on the thread rises to the lower edge of the body of the pen. Calculate the speed with which washer B is moving on its circular path. Repeat the experiment for thread lengths 30 cm, 40 cm and 50 cm below the lower edge of the pipe. Plot a graph between v2 and r taking v2 on y - axis and r on xaxis

Answer 1

No figure is provided. Please upload an attachment of its figure

Answer 2

No figure is provided. Please upload an attachment of its figure