Problem 5-55/5-56/5-6/57/ Engineering Mechanics Materials.

Engineering Mechanics problem with solution
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5–55. Gear B supplies 15 kW of power, while gears A , C and D withdraw 6 kW, 4 kW and 5 kW, respectively. If the shaft is made of steel with the allowable shear stress of tallow = 75 MPa, and the relative angle of twist between any two gears cannot exceed 0.05 rad, determine the required minimum diameter d of the shaft to the nearest millimeter.
The shaft is rotating at 600 rpm.

5–56. The A-36 steel axle is made from tubes AB and CD and a solid section BC . It is supported on smooth bearings that allow it to rotate freely. If the gears, fixed to its ends, are subjected to 85-N . m torques, determine the angle of twist of the end B of the solid section relative to end C . The tubes have an outer diameter of 30 mm and an inner diameter of
20 mm. The solid section has a diameter of 40 mm.

allows the shaft to turn freely about its axis.

[raphaelhenriques]

In the first exercise, how did you get the value for G?