1176

A cable consists of a steel wire,2.5mmindiameter, surroundedbysixbronzewiresof thesamesize.Iftheallowablestressinthe bronze is 60 MPa, find the safe load for the cable and the extension under this load on a length of 30 m (EST= 200 GPa and EBR= 80 GPa). (5 marks)