1.The motor A delivers 3000 hp to the shaft at 1500 rev/min, of which 1000 hpis removed by gear B and 2000 hp is removed by gear C. Determine
(a) the maximum shear stress in the shaft; and
(b) the angle of twist of end D relative to end A. Use G ¼ 12 106 psi for steel, and assume that friction at bearing D is negligible.
2.The solid compound shaft, made of three di¤erent materials, carries the two torques shown.
(a) Calculate the maximum shear stress in each material.
(b) Find the angle of rotation of the free end of the shaft. The shear moduli are 28 GPa for aluminum, 83 GPa for steel, and 35 GPa for bronze