- #1

- 93

- 0

## Homework Statement

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.

kg·m2

(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·N

m= .550 kg

r= .081 m

## Homework Equations

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.

Thank you!