Question

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s.

What is the centripetal force acting on the ball?

1.9 N
23 N
59 N
93 N

Answer 1

Use Fc = m v^2 / r.

Fc = 0.25*(12.2^2)/1.6 = 0.25*148.84/1.6 = 37.21/1.6 ≈ 23.3 N.

Closest choice: 23 N.