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Long answer·Hard exam skill (4/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A horizontal pipe narrows so that its cross-sectional area changes from 6 cm26\text{ cm}^2 to 2 cm22\text{ cm}^2. Water enters the wide section at 2 m s−12\text{ m s}^{-1}. Take ρ=1000 kg m−3\rho=1000\text{ kg m}^{-3}.
Total: 4 marks

(a) Find the speed in the narrow section. (1 mark)

(b) Find the pressure difference between the wide and narrow sections. (2 marks)

(c) State which section has greater pressure. (1 mark)

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cbse-physics-11.u7.t7-3.laq.009

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