A metallic conductor has a resistivity of 35 × 10^?6 ??m. What is the resistance of a piece that is 20 m long and has a uniform cross-sectional area of 4.0 × 10^?6 m2?
a. 0.44 ?
b. 180 ?
c. 2.3 ?
d. 7.0 ?
e. 2 800 ?
b
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A composite beam is made up of a 200 mm 3 300 mm core (Ec 5 14 GPa) and an exterior cover sheet (300 mm 3 12 mm, Ee 5 100 GPa) on each side. Allowable stresses in core and exterior sheets are 9.5 MPa and 140 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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