A 4.0-m-long steel wire has a cross-sectional area of 0.050 cm Its proportional limit has a value of 0.0016 times its Youngs modulus (see Table 11.1). Its breaking stress has a value of 0.0065 times its Youngs 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 funit? (b) How much will the wire stretch under this load? (c) What is the maximum weight that 1he wire can support?
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