The figure to the right shows the shape and dimension of a small dam. Assuming the 21 m water level is at the top of the dam and that the shape of the dam is a semicircle, find the total force on the face of the dam. Use 1000 kg/m for the density of water and 9.8 m/s for the acceleration due to gravity. Find the width function w(y) for each value of y on the face of the dam. In this case, choose an origin so that y = 0 is the middle of the top of the tank, and a y-value of the negative radius of the semicircle is the bottom of the tank. Choose the correct answer below. OA. w(y)= 2: 110.25 -y2 O B. w(y)=2(y? - 110.25) O C. w(y)=2wyz - 110.25 O D. w(y)= 2(110.25 -y?)