A tensile member is being designed for a car. It must withstand a repeated load of 3500 N and not elongate more than 0.12 mm in its 630-mm length. Use a design factor of 8 based on ultimate strength, and compute the required diameter of a round rod to satisfy these requirements using
(a) AIS1 1020 hot-rolled steel,
(b) AISI 4140 OQT 700 steel, and
(c) aluminum alloy 6061-T6. Compare the mass of the three options.
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