May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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13Upthrust BuoyancyMedium1 mark
Four different objects are in equilibrium in identical beakers of water as shown.
Two of the objects have volume V and the other two objects have volume 2V.
Which object is acted upon by the greatest upthrust?
four identical beakers of water, each with one shaded object: A, a small block of volume V fully submerged and resting on the bottom; B, a larger block of volume 2V fully submerged and resting on the bottom; C, a small block of volume V floating at the surface, about half its height above the water line and half below; D, a larger block of volume 2V floating at the surface, with most of its height below the water line and a smaller part above