Consider two bars, one having a circular section of radius b, the other an elliptic sect...

Consider two bars, one having a circular section of radius b, the other an elliptic section with semiaxes a, b (Figure P6.14). Determine (a) for equal angles of twist, which bar experiences the larger shearing stress, and (b) for equal allowable shearing stresses, which bar resists a larger torque.