Slotted arm OB oscillates about the vertical by the action of the rotating crank CA of 5-in. length, where the pin A engages the slot. For a constant speed N = 120 rev/min of crank CA, determine and plot the angular velocity β˙ of arm OB as a function of θ through 360°, where β is the angle between OC and OB. Find θ for zero angular velocity of OB.

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25" A- iC B