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For frictionless liquid flow in horizontal tube of varying cross-section, where is pressure greatest?
AWIDER section (Bernoulli: lower v → higher P at same height)
BSame everywhere
CInlet only
DNarrow section
Answer & Solution
Correct answer: A. WIDER section (Bernoulli: lower v → higher P at same height)
Same height: P + (1/2)ρv² = const. Lower v (wider tube) → higher P. Narrow regions have higher v and lower P (Venturi effect). Foundation of carburetors, atomizers, venturi meters.
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