Question

A disk of radius R = 10 cm rotates uniformly sothatthe speed of point A at the rim is vA = 15m/s.

Assume the disk ishorizontal.

2.1 What is the speedof point B half way to thecenter?

2.2 What is the ratiobetween the centripetalaccelerations of points A and B?

2.3 Suppose that anobject of mass m =0.2kg is placed at point B. How much friction is needed

between the object andthe disk so that the objectwould not slide off?

2.4 What is the total distancetraveled by the object in 1second?