Determine the angular velocity w of the ram head AE of the rock crusher in the position for which θ = 60°. The crank OB has an angular speed of 60 rev/min. When B is at the bottom of its circle, D and E are on a horizontal line through F, and lines BD and AE are vertical. The dimensions are OB = 4 in., BD = 30 in., and AE = ED = DF = 15 in. Carefully construct the configuration graphically, and use the method of this article.

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B A F