Practice question
Question
A pipe’s cross-sectional area decreases from 0.15m2 to 0.05m2. If water flows at 1.8m/s in the larger section, what is the speed in the smaller section?
Explanation
Continuity equation: A1v1 = A2v2. A1 = 0.15m2, v1 = 1.8m/s, A2 = 0.05m2. v2 = A1v1A2 = 0.15×1.80.05 = 5.4m/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 5.4 m/s. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Discussion
Comments
Share your thoughts. New comments appear after admin approval.
Please log in to join the discussion.
Login to commentNo comments yet. Be the first to start the discussion.