Problem 4. A diagonal gate hinged at the bottom of a large, horizontal square tube of width b = 5 m (into the page) separates two vertical tubes open to the atmosphere. In order to maintain different water levels on each side of the gate, our hero Bob must pull on a chain attached to the middle of the gate. How hard does Bob have to pull to maintain a differential water level of 1.0 m? Assume "h,0 = 9.81 kN/m and ignore Bob's body. Hint: All the information needed to solve the problem is in the figure below, plus some. 1.0 m Bob 4.0 m Water Water 3.0 m F 7 2.0 m 45 1.0 m 1 B Hinge +2.0 m