A Levels Physics (9702)•9702/13/M/J/18
Explanation
Archimedes' Principle Determines Upthrust
Steps:
- All cuboids identical, so same volume V when fully immersed.
- Each displaces volume V of water.
- Upthrust = weight of displaced water = ρ V g for each.
- Own density irrelevant to upthrust.
Why A is correct:
- Upthrust equals weight of displaced fluid; identical volumes mean identical upthrust.
Why the others are wrong:
- B: Upthrust same for all, not twice.
- C: Upthrust same, not twice.
- D: Upthrust equals ρ V g, not zero.
Final answer: A
Topic: Density and pressure
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