moment M that will produce a maximum stress of 60 12 mm -75 mm- -12 mm 12 mm B C 75 mm 250 mm D 12 mm

3. The beam is made of steel that has an allowable stress of oallow = 40 ksi. Determine the largest internal moment the beam can resist if the moment is applied (a) about the z axis, (b) about the y axis. 3 in 0.25 in. 0.25 in. 3 in. 3 in. 3 in. 10.25 in.

If the internal moment acting on the cross-section is 800 N.m, determine the maximum tensile and compressive bending stresses acting in the beam. Sketch the stress-distribution acting on the cross-section.

The beam has a square cross section and is made of wood having an allowable shear stress of Tallow= 1.4 ksi. If it is subjected to a shear of V= 1.5 kip, determine the smallest dimension a of its sides. Sketch the shear stress distribution acting across the beam's cross section. Hint: Construct the stress distribution in 2D similar to in-class examples, rather than isometrically similar to the textbook examples for clarity. V = 1.5 kip