PROBLEM 9.96 Using Mohr’s circle, determine the moments of inertia and the product of inertia of the L5 ×3 ×12-in. angle cross section of Problem 9.78 with respect to new centroidal axes obtained by rotating the xand y axes through o30 counterclockwise. SOLUTION Have 49.45 inxI=42.58 inyI=From Problem 9.78 42.8125 inxyI=Now 4ave6.015 in2xyIII+==and ()222xyRI−=+44.43952 in=Then ( )122.81252tan39.319.452.58mθ−−==−°
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