A 36 m long steel wire has a cross-section area of 0047 cm2, Ask an Expert

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A 3.6 m long steel wire has a cross-section area of 0.047 cm2. Its proportional limit has a value of 0.0015 times its Young's modulus (see table). Its breaking stress has a value of 0.0069 times its Young's modulus. The wire is fastened at its upper end and hangs vertically.

(a) How great a weight can be hung from the wire without exceeding the proportional limit? N

(b) How much will the wire stretch under this load? mm

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