Disk acceleration physics homework

[monkey9988]

Homework Statement

A force of 2.2N acts tangentially to the rim of a solid 52kg disk, with a radius of 32cm. How long does it take to accelerate the disk, rotating about an axis though it's center and perpendicular to it's plane, from rest to 210 rev/min?

Homework Equations

Idisk=.5mr^2
T=I (wierd fish symbol)
fish symbol = Wf - Wi
t

The Attempt at a Solution

i don't know how to find the weird fish symbol.. one because i don't know what it stands for and two. i need that inorder to find time..

HELP PLEASE!?

 

[Andrew Mason]

Homework Statement

A force of 2.2N acts tangentially to the rim of a solid 52kg disk, with a radius of 32cm. How long does it take to accelerate the disk, rotating about an axis though it's center and perpendicular to it's plane, from rest to 210 rev/min?

Homework Equations

Idisk=.5mr^2
T=I (wierd fish symbol)
fish symbol = Wf - Wi
t

The Attempt at a Solution

i don't know how to find the weird fish symbol.. one because i don't know what it stands for and two. i need that inorder to find time..

HELP PLEASE!?

Welcome to PF.

The weird fish symbol is the greek letter alpha: \alpha which means angular acceleration and has units of radians/time^2. The relationship between acceleration (distance/time^2) and \alpha for a point rotating about a centre of rotation located at a distance r away is: \alpha = a/r.

The relationship between torque and angular acceleration for a rigid object is:

\tau = I\alpha

In order to answer this question, you will have to understand what that equation means.

AM