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!