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.)

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  1. 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
    7m*densitywater*g=7*1010kg*9.8m/s^2* 1/area

    pressure= you do it from above.

    Total force= pressure*200*14 Netwons

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