# Non uniform circular motion of a disc

1. Oct 11, 2009

### dsimpson

1. The problem statement, all variables and given/known data
When powered up, a disk drive starts at rest and spins up with non-uniform acceleration. this lasts for 1.66 seconds after which it does not accelerate any more. how fast is it spinning at .87 seconds?
alpha(i)=605 rad/s^2
B=1.89
Radius=2.03 cm

2. Relevant equations

alpha=alpha(i)sin(Bt)

3. The attempt at a solution

i don't know how to relate the tangential acceleration into my velocity. I know that At^2=Ar^2+At^2 and At^2=v^2/r, but i can't finish this. please help!

2. Oct 11, 2009

### Astronuc

Staff Emeritus
3. Oct 11, 2009

### dsimpson

so if i understand you correctly, i just need to integrate to achieve my answer?

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