Atie rod used to pull a trailer with a truck is estimated to carry a steady load of 50,000 n. it is shaped as a rod of circular cross section with a diameter of 40 mm. the design needs a factor of safety of 2.5, while yielding is the failure criterion. select a suitable material for the tie rod from the table of aisi steels, knowing that the stronger the material, the more expensive it is to purchase and process it.