# Homework Help: Calculating Angular acceleration of wheel

1. Nov 29, 2011

### AkkiJay

1. The problem statement, all variables and given/known data
Calculate the angular acceleration in radians per second squared of a wheel that starts from rest and attains an angular velocity of 545 revolutions per minute in 1.00 minute. (a) What is the angular displacement in radians of the wheel during the first 0.500 min? (b) During the second 0.500min?

2. Relevant equations
d=T/I
v=d/t
Angular speed/time interval=angular acceleration

3. The attempt at a solution
v*t=d 545 * 1=545
(545)*(0.500min)

Thank you

2. Nov 29, 2011

### TaxOnFear

What are the units for angular velocity?

3. Nov 29, 2011

### DoTell

...and how do you convert revolutions per minute to this unit?

4. Nov 30, 2011

### TaxOnFear

That's what I'm asking the OP to do. We can't do the work for him, but point him in the right direction.

5. Dec 1, 2011

### AkkiJay

Radians per second squared i think the answer should be in...can you tell me the right formulas to use because i am not sure if these are right or not.

6. Dec 1, 2011

### TaxOnFear

Nearly, that's the units for angular acceleration. Angular velocity is Rad/s.

The problem asks you to find the angular acceleration first, so do that, and we'll go from there.

7. Dec 8, 2011

### AkkiJay

Ok, I have found that answer already...Can you tell me what type of lever (what class) is testtube that we use in chemistry? 1st, 2nd, or 3rd...I am thinking 1st