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A pressure-pump has a horizontal tube of cross-sectional area 10 cm² for the outflow of water at a speed of 20m/s. The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is: [given: density of water = 1000kg/m³]

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answer is D.

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Detailed Solution

$F = ρ a ν^{2} = 10^{3} \times 10 \times 10^{- 4} \times 20 \times 20 F = 400$

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