The tank shown in FIGURE CP14.72 is completely filled with a liquid of density ρ. The right face is not permanently attached to the tank but, instead, is held against a rubber seal by the tension in a spring. To prevent leakage, the spring must both pull with sufficient strength and prevent a torque from pushing the bottom of the right face out.
a. What minimum spring tension is needed?
b. If the spring has the minimum tension, at what height d from the bottom must it be attached?

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Rubber seal- FIGURE CP14.72