3. The cleaning trough is filled to its top with a solvent having a density of 2.78 slug ft$^3$.
Determine the magnitude of the resultant force acting on the parabolic end plate, and the
location of the center of pressure measured from the top. Solve the problem using the
formula method. Unless otherwise stated, take the density of water to be $\rho_w = 1000$
kg/m$^3$ and its specific weight to be $\gamma_w = 62.4$ lb/ft$^3$. Also, assume all pressures are gage
pressures unless stated otherwise.