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Problem 4 (11-18E). The flow of water from a reservoir is controlled by a 1.5-m-wide L-shaped gate hinged at points A, as shown in the figure. If it is desired that

the gate opens when the water height is 3.7 m, determine the mass of the required weight W. 2.4 m W s = 0.9 m h=3.7 m B

Fig: 1