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(300 mm×12 mm,Ee=100GPa)\left( 300 \mathrm {~mm} \times 12 \mathrm {~mm} , E _ { e } = 100 \mathrm { GPa } \right)

question 2

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 A composite beam is made up of a 200 mm×300 mm core (Ec=14GPa)  and an exterior cover sheet \text { A composite beam is made up of a } 200 \mathrm {~mm} \times 300 \mathrm {~mm} \text { core } \left( E _ { c } = 14 \mathrm { GPa } \right) \text { and an exterior cover sheet } (300 mm×12 mm,Ee=100GPa) \left( 300 \mathrm {~mm} \times 12 \mathrm {~mm} , E _ { e } = 100 \mathrm { GPa } \right) on each side. Allowable stresses in core and exterior sheets are 9.5MPa9.5 \mathrm { MPa } and 140MPa140 \mathrm { MPa } , respectively. The ratio of the maximum permissible bending moment about the zz axis to that about the yy axis is most nearly: \text { A composite beam is made up of a } 200 \mathrm {~mm} \times 300 \mathrm {~mm} \text { core } \left( E _ { c } = 14 \mathrm { GPa } \right)  \text { and an exterior cover sheet }   \left( 300 \mathrm {~mm} \times 12 \mathrm {~mm} , E _ { e } = 100 \mathrm { GPa } \right)   on each side. Allowable stresses in core and exterior sheets are  9.5 \mathrm { MPa }  and  140 \mathrm { MPa } , respectively. The ratio of the maximum permissible bending moment about the  z  axis to that about the  y  axis is most nearly:   A)  0.5 B)  0.7 C)  1.2 D)  1.5


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