Randall D. Knight — Fluids and Elasticity: Problem Challenge_Problem_73

The tank shown in FIGURE CP14.73 is completely filled with a liquid of density \(\rho\). 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?