A water main of 1.5 m diameter and 20 mm thick is subjected to an pressure of 1.5N/mm². Calculate the circumferential stress induced in the pipe.

A water main of 1.5 m diameter and 20 mm thick is subjected to an pres

1.	A water main of 1.5 m diameter and 20 mm thick is subjected to an pressure of 1.5N/mm². Calculate the circumferential stress induced in the pipe.
A.	78.65 N/mm²
B.	68.45 N/mm²
C.	56.25 N/mm²
D.	60.85 N/mm²
Answer» D. 60.85 N/mm²