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Q10 P
Expert-verifiedA swimming pool has dimensions and a flat bottom. When the pool is filled to a depth of with fresh water, what is the force exerted by the water on (a) the bottom? (b) On each end? (c) On each side?
(a) The force exerted by the water on the bottom is .
(b) The force exerted by the water on each end is .
(c) The force exerted by the water on each side is .
The pressure in a fluid is the force per unit area exerted by the fluid on a surface:
Where, P is the pressure, A is area, and F is the force exerted on the fluid.
The pressure on the bottom due to the water is
The force exerted by the water on the bottom is then
Hence, the force exerted by the water on the bottom is .
Pressure varies with depth. On a strip of height dy and length L, the force
Which gives the integral as below.
On each end,
Hence, the force exerted by the water on each end is role="math" localid="1663669149245" .
On the side,
Hence, the force exerted by the water on each side is .
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