Answer:
The total force is (4,626,384L) Newton
Explanation:
Total force = total pressure × area of rectangular tank
Area of rectangular tank = Length (L) × Width(W) = L × 7 = (7L) m^2
Pressure (P) h×rho×g
height (h) of oil = 8m, rho = 880kg/m^3
Poil = 8×880×9.8 = 68,992N/m^2
height (h) of water = 6m, rho = 1000kg/m^2
Pwater = 6×1000×9.8 = 58,800N/m^2
height (h) of mercury = 4m, rho = 13,600kg/m^3
Pmercury = 4×13,600×9.8 = 533,120N/m^2
Total pressure = Poil + Pwater + Pmercury = 68,992N/m^2 + 58,800N/m^2 + 533,120N/m^2 = 660,912N/m^2
Total force = 660,912N/m^2 × (7L) m^2 = (4,626,384L) Newton