- #1
Victorzaroni
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Homework Statement
Masses M1 and M2 are separated by a distance L. The distance of the center of mass of the system at P from M1 as shown above would be:
(A) (M1L)/(M2)
(B) ((M2+M1)L)/M1
(C) ((M2+M1)L)/M2
(D) (M2L)/(M1+M2)
(E) (M1L)/(M1+M2)
The moment of inertia of the system about the center of mass at P would be:
(A) (M1+M2)L^2
(B) [(M1+M2)/(M1M2)]L^2
(C) (M1M2L^2)/(M1+M2)
(D) (M1L^2)/(M1+M2)
(E) (M2L^2)/(M1+M2)
All of the 1s and 2s should be subscripts, I'm just lazy.
Homework Equations
Xcom=(M1X1+M2X2)/(M1+M2)
I=ML2?
The Attempt at a Solution
I got the first part, that ended up being simple. The answer was D. I don't understand how to get the moment of inertia though. I tried doing I=mL^2=>I=(M1+M2)(Choice D)^2, but it didn't work. Help!
Kids were telling me it was C, but I don't know how to get that.