A grinding wheel is a uniform cylinder with a radius of 8.10 cm and a mass of 0.550 kg.
(a) Calculate its moment of inertia about its center.
(b) Calculate the applied torque needed to accelerate it from rest to 1700 rpm in 2.00 s if it is known to slow down from 1700 rpm to rest in 55.0 s.
m= .550 kg
r= .081 m
I have tried I=mr^2, but that is not working. That is all I know how to do.
The Attempt at a Solution
Attempted I=(.550)(.081)^2 and got a very small decimal that was incorrect. I would love to know how this equation is done.