21. Simply supported beam 8 m length has a 2,000 kg load at the center. The flexural stress is 25,000 kPa. Find the section modulus.

3.03 The beam shown below is an aluminum channel, C 100 × 50 × 25.79, positioned with the legs down so that the flat 100 mm surface can carry the applied loads. Compute the maximum tensile and maximum compressive stresses in the channel. 5000 N 2000 N 5200 N 225 mm 150 mm 150 mm 75 mm Cross section

41. The wide-flange I beam as shown is 20 ft. long. It is fixed at one end and free at the other. A twisting moment of 30,000 lb-in. is applied at the free end. If E=30×10° psi and G =12x10° psi, compute the maximum normal and shearing stresses due to bending and the maximum shearing stress due to twist. What is the angle of twist of the beam at the free end? 10.5" 1.368" 0.845" 10" prob 41

Answer the below using the sections method for a pinned beam. show all working out.