Assume that all gear blanks are solid circular cylinders unless specified otherwise.
For the planetary gear train shown in Fig. 1, N1 = 20, N2 = 40, N3 = 40, and N4 = 25 teeth. If gear 4 is rotating at 300 rpm in a clockwise direction as viewed from the right, what will be the speed and direction of the rotation of the arm used as the out- nut shaft?
Figure 1

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