2. An external pressure of 10 MN/m is applied to a thick cylinder of internal diameter 160 mm and external diameter 320 mm. If the maximum circumferential stress permitted on the inside wall of the cylinder is limited to 30 MN/m, what maximum internal pressure can be applied assuming the cylinder has closed ends? What will be the change in outside diameter when this pressure is applied? [max. pressure = 34 MN/m; increase in D. = 14.7 10 mm]