Problem 5-37/5-38/5-39/ Engineering Mechanics Materials

Engineering Mechanics problem with solution
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5–37. A ship has a propeller drive shaft that is turning at 1500 rev/min while developing 1800 hp. If it is 8 ft long and has a diameter of 4 in., determine the maximum shear stress in the shaft caused by torsion.

5–38. The motor A develops a power of 300 W and turns its connected pulley at 90 rev/min. Determine the required diameters of the steel shafts on the pulleys at A and B if the
allowable shear stress is tallow = 85 MPa.

5–39. The solid steel shaft DF has a diameter of 25 mm and is supported by smooth bearings at D and E . It is coupled to a motor at F , which delivers 12 kW of power to the shaft while it is turning at 50 rev/s. If gears A, B , and C remove 3 kW, 4 kW, and 5 kW respectively, determine the maximum
shear stress developed in the shaft within regions CF and BC . The shaft is free to turn in its support bearings D and E.

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