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2. [20 pt.] A motor drives a shaft at 12 Hz and delivers 20 kW of power (see figure). a) If the shaft has

2. [20 pt.] A motor drives a shaft at 12 Hz and delivers 20 kW of power (see figure). a) If the shaft has a diameter of 30 mm, what is the maximum shear stress Tmax in the shaft? b) If the maximum allowable shear stress is 40 MPa, what is the minimum permissible diameter dmin of the shaft? d 20 kW 12 Hz

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