posted by shaknocka .
The vertical surface of a reservoir dam that is in contact with the water is 200 m wide and 14 m high. The air pressure is one atmosphere. Find the magnitude of the total force acting on this surface in a completely filled reservoir. (Hint: The pressure varies linearly with depth, so you must use an average pressure.)
average pressure: air pressure doesn't count, because it is on both sides of the dam.
avg pressure due to water: avg depth 14 m.
Water of 7 m high generates a pressure of
pressure= you do it from above.
Total force= pressure*200*14 Netwons