The design of the gear-and-shaft system shown requires that steel shafts of the same diameter be used for both AB and CD. It is further required that τmax ≤ 60 MPa and that the angle ϕD through which end D of shaft CD rotates not exceed 1.5°. Knowing that G = 77.2 GPa, determine the required diameter of the shafts.
Fig. P10.55

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