Q. 43

Expert-verifiedFound in: Page 200

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

A 4.4-cm-diameter, 24 g plastic ball is attached to a 1.2-m-long string and swung in a vertical circle. The ball’s speed is 6.1 m/s at the point where it is moving straight up. What is the magnitude of the net force on the ball? Air resistance is not negligible.

The Net force on the ball is = 0.7308 N

Ball diameter = 4.4-cm-diameter,

mass =24 g

String length = 1.2-m

v= 6.1 m/s

First draw a diagram as below

From the figure find the T as below

So the radius will be = 1.2m+2.2 cm = 1.222m

Centripetal force is given by

This force is equal to tension on the string

So the force is 0.7308 N

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