Homework Answers
By angular momentum conservation
Li = Lf
(Iω) initial = (Iω) final
1/2mr2ω = (1/2mr2 + (m/3)(r/2)2)ωf
ωf =( 6/7)ω
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A person with mass mp = 74 kg stands on a spinning
platform disk with a radius of R = 2.37 m and mass md =
184 kg. The disk is initially spinning at ? = 1.9 rad/s. The person
then walks 2/3 of the way toward the center of the disk (ending
0.79 m from the center).
1) What is the total moment of inertia of the system about the
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A person with mass mp = 76 kg stands on a spinning platform disk
with a radius of R = 1.89 m and mass md = 191 kg. The disk is
initially spinning at ω = 1.6 rad/s. The person then walks 2/3 of
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center).
1)
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