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Stress Concentrations
The beams shown in the figure are subjected to bending moments M = 2100 lb-in. Each beam has a rectangular cross section with height h= 1.5 in. and width b = 0.375 in. (perpendicular to the plane of the figure).
(a) For the beam with a hole at midheight, determine the maximum stresses for hole diameters d = 0.25, 0.50, 0.75, and 1.00 in.
(b) For the beam with two identical notches (inside height h1= 1.25 in.), determine the maximum stresses for notch radii R = 0.05, 0.10, 0.15, and 0.20 in.
A closed system undergoes a process in which there is a heat transfer of 110 btu into the system. The work done on the system is 70 btu. Initial internal energy of the system is 1300 btu, what is the final energy of the system in btu.
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