Rotational kinematic equations:
For the first round:
For the second round:
We need an expression that does not have ω (ω1, ω2):
θ1 = ω0t1 + (1/2)αt12
2π = 0 + (1/2)(α)(t2) Equation 1
θ2 = ω0t2 + (1/2)αt22
A computer disk drive is turned on starting from rest and has a constant angular acceleration. If it took 0.0865 s for the drive to make its second revolution,
(a) how long did it take to make the first complete revolution, and
(b) what is its angular acceleration, in rad/s2?
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