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What is the force of the water flowing vertically onto a paddle from a 20-mm diameter pipe and a flow rate of one liter per second and does the force double if the flow rate is doubled?

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You need to know the distance from the pipe to the paddle to ascertain the velocity. Force = mass of water x square of the velocity assuming it is stopping at the paddle. The force would quadruple if it were following twice as fast since the force is proportional to the velocity squared.
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