For each section illustrated, find the second moment of area, the location of the neutral axis, and the distances from the neutral axis to the top and bottom surfaces. consider that the section is transmitting a positive bending moment about the z axis, mz, page 154where mz = 10 kip · in if the dimensions of the section are given in ips units, or mz = 1.13 kn · m if the dimensions are in si units. determine the resulting stresses at the top and bottom surfaces and at every abrupt change in the cross section.

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?