Solve Problem 6.133 when (a) α = 60°, (b) α = 90°.
PROBLEM 6.133 The Whitworth mechanism shown is used to produce a quick-return motion of Point D. The block at B is pinned to the crank AB and is free to slide in a slot cut in member CD. Determine the couple M that must be applied to the crank AB to hold the mechanism in equilibrium when (a) α = 0, (b) α = 30°.

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