3–10. The block has a weight of 20 lb and is being hoisted at uniform velocity. Determine the angle 0 for equilibrium and the force in cord AB. 3-11. Determine the maximum weight W of the block that can be suspended in the position shown if cords AB and CAD can each support a maximum tension of 80 lb. Also, what is the angle 0 for equilibrium? В 20° А D C F

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26.0

For the load group and influence line shown, P₁ = 8 kips, P₂ = 32 kips, P3 = 32 kips, a = 14', and b = 18'. The influence line is for V40 = shear just left of 40'. Determine V40- in kips to two decimal places when the force P₁ is at O'. Use the correct sign. -1 16 0.5 15 20 30 1 P₁ P₂ a b P3