Water flows through a horizontal pipe, with speeds of 2.0 m/s at point X and 4.0 m/s at point Y. What is the pressure difference between X and Y (density of water = 1000 kg/m³)?
Correct answer C. 6.0 kPa
Explanation
ΔP = ½ρ(v_Y² − v_X²) = ½ × 1000 × (16 − 4.0) = 6000 Pa = 6.0 kPa. Using ½ρ(Δv)² wrongly gives 2.0 kPa.
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