Please help, i cant answer part B, but think i am using the right equation! Thanks A student is designing a suspension pull rod for a car. The rod consists of a central tube section that has a wall thickness of 1.0 mm. The following tube diameters are available: 10mm, 8 mm and 6 mm and the maxmimum allowed normal stress in the tube is 100 MPa. If the pull rod is designed to withstand a maximum load of 2500N what is the minimum tube diameter that can be used? 2b) Calculate the change in length for the chosen tube and length 400 mm under max load conditions, E = 210 GPa. 2c) Each end of the pull rod is to be mounted on a wishbone rocker by using a steel bolt in double shear. Using the design load of 2500 N and assuming a factor of safety of 1.5, what is the minimum bolt size that can be used if the shear stress allowed in the bolt is 150 MPa. Assume bolt sizes available are 4 mm, 5 mm, 6 mm and 8 mm.