The discussion focuses on solving problem #21 related to the Moment of Inertia using the parallel axis theorem. The formula provided is I = Icm + D²M, where Icm is the inertia calculated in problem #20, D is the distance from the center of mass to the axis of rotation (which is the radius in this case), and M is the total mass including the hoop and spokes. Participants clarify the definitions of D and M, confirming that D equals the radius and M is the combined mass of the hoop and spokes.
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muna580 said:I am having trouble with #21. I already did #20, but I have NO idea of how to do #21. First of all, I am not really sure where is the axis suppose to be.
muna580 said:Acorrding to the parallel axis theorem, you get the inertia by dong this
I = Icm + D^2M
Where Icm is the inertia with respect to the center, and D is the distnance, and M is the mass.
Well, Icm is the answer I got for #20 right?
Also, what do I use for the D? Is D the radius?
Also, what is M? Is M the mass for the hoop plus the mass of all the 4 spokes?