Select the moment of inertia that would be used to calculate the bending stress at point K.    

An aluminum [E = 10,350 ksi] bar is bonded to a steel [E = 32,550 ksi] bar to form a composite beam as shown. Find the distance to the centroid of the transformed section from the bottom surface of the beam.

Select the most economical W shape in the following table if a section modulus of 90 in.3 is required.

Why do you think that it is important that the drawers of the “crash carts” in the College of Dentistry be sealed?

Two identical beams are loaded with P at different locations. Which beam will have the bending stress with the largest magnitude?

If w = 10.00 in., find the moment of inertia about the z axis. The centroid of the section is located 2.9265 in. above the bottom surface of the beam.

If M = 9.5 kip-ft, find the magnitude of the bending stress at a point 3.92 in. above the bottom surface of the beam. The moment of inertia about the z axis is 124.9 in.4, and the centroid of the section is located 4.7 in. above the bottom surface of the beam.

An aluminum [E = 7,150 ksi] bar is bonded to a steel [E = 29,650 ksi] bar to form a composite beam as shown. Find the distance to the centroid of the transformed section from the bottom surface of the beam.

Two nearly identical beams with different widths are loaded with P at center span. Which beam will have the bending stress with the largest magnitude? Ignore the weight difference between the two beams.

A steel pipe (D = 3.500 in.; d = 3.068 in.) supports a concentrated load of P = 565 lb as shown. The span length of the cantilever beam is L = 4 ft. Determine the magnitude of the maximum bending stress in the pipe.