ch15-p054 - 54. We note that the initial angle is o = 7 =...

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equal to the kinetic energy of the plate ( 1 2 I ω m 2 where this ω m is the maximum angular speed of the plate, not the angular frequency ω ). Noting that the maximum angular speed of the plate is ω m = ωθ o where ω = 2 π / T with T = 20 ms = 0.02 s as determined from the graph, then we can find the rotational inertial from 1 2 I ω m 2 = 0.0093 J. Thus, 52 1.3 10 kg m I . 54. We note that the initial angle is
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