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heyall
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Homework Statement
A thin disk is 100g.
It's diameter is 20cm.
It's thickness is 2cm.
Rotation is about the central axis (ie. perpendicular to the symmetrical plane).
Answer in kg*m2
Homework Equations
I=(1/2)MR2
M is the mass
R is the radius
I is the moment of inertia
The Attempt at a Solution
R = half the diameter ∴ R = 10cm
I= (.5)(.1)(.1)2
I= 0.0005 = 5*10^-4
I don't think the thickness matters as long as it is symmetrical all around.
The reason I ask is because this question is a multiple choice question for marks, but the answer I found (0.0005) wasn't listed as one of the options. Thanks!