A steel hollow tube is used to carry a tensile load of 500 KN at a stress of 140 Mpa. If the outside diameter is 10 times the tube thickness, find the thickness of the tube in millimetre. a U-Bolt supports a load of 6000 lbs. The cross section of the bolt has a diameter of 1/2 inch. How much stress is induced in the sides of the bolt in psi?