AP Physics 2mediummcq1 pt
Water flows through a horizontal pipe with a diameter of 4 cm at a velocity of 2 m/s. The pipe narrows to a diameter of 2 cm. What is the velocity of the water in the narrow section?
A.0.5 m/s
B.1 m/s
C.4 m/s
D.8 m/s
Explanation
Core Concept
By the continuity equation, A₁v₁ = A₂v₂. The area ratio is (d₁/d₂)² = (4/2)² = 4. Therefore, v₂ = v₁ × (A₁/A₂) = 2 m/s × 4 = 8 m/s.
Correct Answer
D8 m/s
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