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Find the moment of inertia of a solid rectangular section 40 mm wide and 60 mm deep about its smaller side.
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Given: For solid rectangular section, b = 40 mm, d = 60 mm

Solution:

For solid rectangular section:

Ibase=IG+(AY)2

=bd312+b.d(d/2)2

=40×60123+40×60×(602)2

=7.20×105mm4

Ibase=28.8×105mm4

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