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[amitray]

need help in determinig the pressure drop across a cylindrical water gun which has 'x' small size holes at the bottom. How to determine the pressure drop if we move piston inside the gun 'd' distance in 't' seconds. The gun is dipped in water tank till the head. I want to know if we fill the water gun what pressure drop will be there and reverse suppose we empty it what pressure is needed. Everything is done inside water.

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