PROBLEM 9.142 The piece of roof flashing shown is formed from sheet copper that is 0.032 in. thick. Knowing that the specific weight of copper is 558 lb/ft3, determine the mass moment of inertia of the flashing with respect to each of the coordinate axes. SOLUTION Have coppermVρ=coppertAgγ=Then 12mm=()3322558 lb/ft1 ft0.032 in.486in12 in.32.2 ft/s=××××20.092422 lb s /ft=⋅Using Fig. 9-2B for components 1 and 2, have Now ()()()()1212and xxxxxIIIII=+=Then ()2221620.092422 lbs/ftft1.54037 lb ft s
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