A thick-walled cylinder of inner radius a = 50 mm is subjected to an interna...

A thick-walled cylinder of inner radius a = 50 mm is subjected to an internal pressure of p_i = 60 MPa. Determine the outer radius b such as to provide (a) a factor of safety against yielding; (b) a factor of safety n = 3 against ultimate collapse based on maximum shearing stress theory of failure.