A trough with a trapezoidal cross-section, as shown in the figure, contains vegetable oil with density 930 kg/m3. (Use g = 9.8 m/s2 for the acceleration due to gravity.) (a) Find the hydrostatic force (in N) on one end of the trough if it is completely full of oil. N (b) Compute the force (in N) on one end if the trough is filled to a depth of 1.8 m. (Round your answer to two decimal places.) N