There are two identical small holes on the opposite sides of a tank containing a liquid. The tank is open at the top. The difference in height between the two holes is h. As the liquid comes out of the two holes, the tank will experience a net horizontal force proportional to
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There are two identical small holes on the opposite sides of a tank, hence velocities of liquid
flowing out of both the holes are 
and 
Now,
Volume of the liquid discharged per second at a hole is
or 
Mass of liquid discharged per second is 
,
Momentum of liquid discharged per second is 
The force exerted at the upper hole is 
and
The force exerted at the lower hole is 
The net force on the tank is
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