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
Planet X has the same average density as Earth but twice Earth's radius.
Total: 2 marks
(a) Express mass in terms of density and radius. (1 mark)
(b) Find the surface gravity of Planet X in terms of Earth's . (1 mark)
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