icker at ain how hydro- ain how hydro- rostatic s of the hydro- find the a lake s 1.1 m is 10 m ting on ne pres- as air at er. point A E. When Dens by hydro- -n when t length -m-high r to the and the ground. and the double Filled to am and 0 K/s fluid-mechani... VoWiFi Dill (b) the force per unit area of the dam near the top and near the bottom. 3-71 A room in the lower level of a cruise ship has a 30-cm-diameter circular window. If the midpoint of the win- dow is 4 m below the water surface, determine the hydro- static force acting on the window, and the pressure center. Take the specific gravity of seawater to be 1.025. Answers: 2840 N, 4.001 m FIGURE P3-71 J SG=0.86 4 m SG = 1.23 FIGURE P3-73 3-72 The water side of the wall of a 70-m-long dam is a quarter circle with a radius of 7 m. Determine the hydrostatic force on the dam and its line of action when the dam is filled to the rim. 30 cm 3-73 For a gate width of 2 m into the paper (Fig. P3-73), determine the force required to hold the gate ABC at its location. Answer: 17.8 kN F 50 cm A 80 cm 40 cm Sea Hinge 581 23:51 B 45 10 cm 3-74 Determine the resultant force acting on the 0.7-m-high and 0.7-m-wide triangular gate shown in Fig. P3-74 and its line of action. 1+ 2 :