A Beam Has a Rectangular Cross-Section 40 Mm Deep, with Second

Multiple Choice

A beam has a rectangular cross-section 40 mm deep, with second moment of area about the neutral axis of 7 % 104 mm4, and is bent into the arc of a circle. For a bending moment of 120 N m, the maximum bending
Stress is:

A) 17.2 MPa
B) 34.3 MPa
C) 68.6 MPa
D) 1714 MPa