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12- Determine the tension of spring BC to keep the round door AB in the closed position (only the pressure d- ). Given that the wing of AB can be rotated about an axis coincident with d - the diameter perpendicular to the plane of the figure . Let d = 40 cm , the pressure on the open surface is the atmospheric pressure , the specific gravity of n - water = 9810 N / m³ Y
Sagot :
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