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
(c) What is the maximum weight that the wire can support? N