Water moves at 0.80 m/s in a pipe of diameter 4.0 cm. What is its speed where the diameter reduces to 2.0 cm?
Correct answer A. 3.2 m/s
Explanation
Area depends on diameter squared, so halving the diameter makes the area one quarter. Using A₁v₁ = A₂v₂, v₂ = 0.80 × (4.0/2.0)² = 3.2 m/s.
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