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
Water flows horizontally through a venturi tube. The broad section has area and the narrow section has area . The volume flow rate is . Take .
Total: 4 marks
(a) Find the speed in the broad section. (1 mark)
(b) Find the speed in the narrow section. (1 mark)
(c) Find the pressure difference between the two sections. (2 marks)
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