# HW8 - HOMEWORK PROBLEMS Week 8 Due Friday 4 November 1...

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HOMEWORK PROBLEMS Week 8: Due Friday 4 November 1. Determine which of the shafts in Figure 1 experiences the greatest shear stress and find the magnitude of that stress. diameter = 40 mm 50 mm 45 mm B C D A 800 N m 1100 N m 500 N m Figure 1 2. A 10 kW motor rotating at 1000 rpm is used to drive a machine through a solid steel shaft of diameter 20 mm. Determine the maximum shear stress in the shaft. 3. A flexible shaft consists of a 3 mm diameter steel wire in a flexible hollow tube which imposes a frictional torque of 0.04 Nm per meter when the shaft rotates. The shaft is to be used for applying a torque of 0.1 Nm to actuate a switch. What is the maximum length of shaft that may be used if the shear stress in the shaft is not to exceed 50 MPa. If shaft is actually of length 2 m, and if the switch has to rotate through 0.2 radians to move from the ‘off’ to the ‘on’ position and vice versa , how much relative rotation must be imposed at the other end of the shaft to turn the shaft on and then off. ( G steel = 80 GPa) 1

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4. Figure 4 shows a solid steel cylindrical bar
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HW8 - HOMEWORK PROBLEMS Week 8 Due Friday 4 November 1...

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