- #1

- 7

- 0

## Homework Statement

A turntable must spin at 33.3RPM (3.49 rev/s) to play an old fashioned vinyl record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 2 revolutions, starting from rest? The turntable is a uniform disk of diameter .305m and mass 0.22kg.

## Homework Equations

I = 0.5MR²

[itex]\tau[/itex] = [itex]\alpha[/itex]I

[itex]\alpha[/itex] = (ωf-ωi)/t

## The Attempt at a Solution

I=(0.5)(0.22kg)(.1525²)=2.56x10^-3 kgm²