A trough whose cross section is a trapezoid is b = 6 m across at the bottom, a = 8 m across at the top, and 2 m deep. If the trough is lled to 1 m with water, what is the force due to water pressure on one end of the trough? (Hint: Using SI units, pg = 9800 N/m3.) (Use decimal notation. Give your answer to two decimal places.) A trough whose cross section is a semicircle of radius r = 2 m is filled with water. What is the force due to water pressure on one end of the trough? Use the acceleration due to gravity g = 9.8 m/s2. (Use decimal notation. Give your answer to the nearest whole number. Express your answer in kN (recall that 1 kN = 1000 N.))