Moment of inertia of cylinder with a rectangel shaped hole

AI Thread Summary
To calculate the moment of inertia for a cylinder with a rectangular hole, one must first determine the inertia of the cylinder and then subtract the inertia of the rectangular section. The discussion highlights the need for the inertia equation of a rectangle when the rotation axis is perpendicular to its plane. Participants suggest using double integrals to derive the necessary formula from first principles if the standard equations are insufficient. Clarification on the specific axis of rotation is also sought to provide accurate assistance. Understanding these calculations is essential for solving the problem effectively.
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i know how to calculate the inersia for the cylinder, than i have to take away the inersia of the rectangel, but i can't find an equation for the inersia for a rectangel with the plane spinning perpendicular to the rotation axis, please help !
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Which axis do you want?
Does this wiki page help? Have you looked anywhere else for this info?
 
sophiecentaur said:
Which axis do you want?
Does this wiki page help? Have you looked anywhere else for this info?
dont think so, they give me the equation for the inersia about the x and y axis, in my case the axis pierces the plane of the rectangel.
 

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