Short answer·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 constant torque of acts on a rotor initially at rest. The rotor turns through while the torque acts.
Total: 3 marks
(a) Find the work done by the torque. (1 mark)
(b) If the rotor's moment of inertia is , find its final angular speed. (2 marks)
Something wrong with this item?