Case study·Standard multi-step (3/5)·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 paddle wheel stirs water in an insulated vessel. The shaft does of work on the water and no heat is exchanged with the surroundings.
Total: 4 marks
(a) What is for the water? (1 mark)
(b) What is the work done by the water? (1 mark)
(c) Find the change in internal energy of the water. (1 mark)
(d) State what should happen to the temperature of the water. (1 mark)
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