1. The problem statement, all variables and given/known data The upper edge of a gate in a dam runs along the water surface. The gate is 2.00 m high and 4.00 m wide and is hinged along a horizontal line through its center (Figure 1) Calculate the torque about the hinge arising from the force due to the water. (Hint: Calculate the torque on a thin, horizontal strip at a depth h and integrate this over the gate.) 2. Relevant equations F = Pressure * Area M = Density * Volume Torque = Force * Moment-Arm Pressure = Density * gravity * depth (edit: I recently found this out) 3. The attempt at a solution I found out that pressure would be: 1x103 * gravity * depth And since we want the total pressure we will have to integrate correct? Therefore our varying variable will be h (height) so pressure would be: ∫ from 0 - 1 (the middle of that gate) of (1x103 * gravity * h) dh correct? And do I now multiply the answer from that by the area ( 4 * 2 = 8) to get the force? Then multiply that force by the moment arm? (Not sure how to get this though.) Any and all help is appreciated.