- #1
reckk
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Homework Statement
http://img232.imageshack.us/img232/4976/physicswe5.jpg
total mass of the rod = 4m
m = 0.4kg; b = 0.4m; a = 1.0m
rod is thin
i need to find the mass moment of inertia for the rotating rod relative to z-axis..
Homework Equations
(1/12)ML²
The Attempt at a Solution
for the rod which lies on y axis, i could calculate the mass moment of inertia by using the above equation which will lead me to the following answer
(1/12)*2*0.40*0.8² = 0.0427
but what should i do with the other parts of the rod which are parallel with the z-axis?..
or could i apply the following equation?:
(1/24)*M*L²*sin (2φ)
where φ = 45
thx in advance..
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