Accounting for Gear Rotation  
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millimeter diameter and 300 millimeter and 900 millimeter respectively, are connected using two gears, B with 100 millimeter diameter and C with 200 millimeter diameter. The angular displacement on gear with 100 millimeter diameter is phi subscript B. A torque T is applied at the end of C D at D. Parameters: d = 35 millimeter, G = 80 gega Pascal, T = 685 Newton meter.

In shaft (1), the angle of twist is:

Since gear B is connected to shaft (1), it rotates the same amount; therefore, the rotation angle at B is:

Recall that a positive rotation angle rotates in a positive right-hand-rule sense about the +x axis.