Moment of Inertia of a Rectangle
Mediummoment of inertiarectangles
A rectangle has width b = 0.30 m and height h = 0.60 m. What is Ix about its centroidal horizontal axis?
- A0.0018 m⁴
- B0.0054 m⁴
- C0.0108 m⁴
- D0.018 m⁴
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Answer: B. 0.0054 m⁴
For the centroidal horizontal axis, Ix = bh³/12 = 0.30(0.60)³/12 = 0.0054 m⁴. The dimension perpendicular to the axis is cubed.
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