- #1
PhyIsOhSoHard
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Homework Statement
http://img577.imageshack.us/img577/2069/inertia.gif
The following figure with these known lengths are given. I need to find the moment of inertia.
Homework Equations
According to my book's facit, this is the solution:
http://img845.imageshack.us/img845/6725/inertiaformula.png
The Attempt at a Solution
This is what I understand so far...
The fraction h/2 refers to half the figure (when cut from horizontal). So you start from the middle of the figure, and then move up to the end in which case you have traveled the vertical length h/2. Then by multiplying the entire integral with 2, you take the bottom half of the figure into account as well (since it's symmetrical).
I have no idea about the fraction. I've tried, but I have no idea how they came up with that. All I know is that "y" is the vertical axis for the figure...
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