4.35. For the water tank shown in Fig. 4.43, compute the magnitude and location of the total force on the inclined wall. Known values: 5.9. A steel cube 100 mm on a side weighs 80 N. We want to hold the cube in equilibrium under water by attaching a light foam buoy to it. If the foam weighs 470 N/m, what is the minimum required volume of the buoy? Known values: 8 ft Governing equations: Calculations: Fig for P4.35 Water 10 ft 5000 15 ft Governing equations: Calculations: Foam Steel WS Fig for P5.9 Page 10 4.52. Use Fig. 4.52. The surface is 1.50 m long. Compute the magnitude of the horizontal component of the force and compute the vertical component of the force exerted by the fluid on that surface. Then compute the magnitude of the resultant force and its direction. Show the resultant force acting on the curved surface. 5.12. Figure 5.20 shows a cube floating in a fluid. Derive an expression relating the submerged depth X, the specific weight of the cube, and the specific weight of the fluid. Known values: Fig for P5.12 Fluid surface Known values: 1.20 m A + h= 2.80 m hp hc Governing equations: R-s-1.20 m FM FR 10 Fig for P4.52 2.80m Governing equations: 1.20-radius Page 9 Calculations: Wr