I'm here to check my answers please correct me if I'm wrong.
A student places an object with a mass of m on a disk at a position r from the center of the disk. The student starts rotating the disk. When the disk reaches a speed of 0.8 m/s, the object starts to slide off the disk. What is the coefficient of static friction between the object and the disk?
Mass: 100 g, r= 0.75 m
V= sqrt(mugr)
V^2=mugr
Mu= v^2/gr
Mu= 0.8 m/s^2/ (9.8 m/s^2)(0.75 m)
Mu= 0.087