I Need Concepts To Solve Problem 1 Its A Submerged Gate Hinge Problem I Don’T Know How To Do The Momentum

The formulae is,
γ (2πr) = ρh(πr2)g
74 (2πr) = 990 * 100*102*(πr2)*9.81
R = 7.33 * 10-5 cm The result we get is not reasonable as trees shows negative pressure which means suction
mechanism,…Engineering Technology