A boiler shell of 200 cm diameter and a plate thickness of 1.5 cm is subjected to an internal pressure of 1.5 MN/m2. The hoop stress induced in the shell is:

A cylindrical shell 3 m long with closed ends has an internal diameter of 1 m and a wall thickness of 15 mm. Calculate the circumferential (hoop) stress if it is subjected to an internal pressure of 1.5 MN/m2.