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sktgurl930
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Homework Statement
A computer hard disk starts from rest, then speeds up with an angular acceleration of 198 rad/s2 until it reaches its final angular speed of 7683 rpm. How many revolutions has the disk made 10.7 s after it starts up?
Homework Equations
t=wf/a
delta0=wi*t+(1/2)(a)t^2
The Attempt at a Solution
when using the first equation i got t=804.561878/198=4.06
then i plugged it into the second equation which would be delta0=0*4.06+(.5)(198)(6.63655)^2
=4.06+99*44.04
=4364.4039
but it says that its wrong i don't understand what I am doing wrong