In the mechanism shown, the block B is constrained to move vertically and is attached to the bar BD. The point A on the bar AD is fixed. Express all your answers in the component system shown.
At the instant shown, the block B is moving downward at a constant speed of 2.5 ft/s, ϕ = 45°, and θ = 30°. If ℓ = 12in. and d = 8 in., determine the angular acceleration of bar AD at this instant.
Figure P6.94
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