Physics (AS & A Level) · May / June 2022 · Paper 13 · Question 15

A block of wood of density ρ_w has sides of length a. The block is immersed in a liquid of density ρ_L. The top surface of the block is at a depth h below the surface of the liquid. [diagram: block of wood of side a immersed in liquid, top surface at depth h below liquid surface] The acceleration of free fall is g. What is the upthrust acting on the block from the liquid?

1. Aρ_L a³ g
2. Bρ_w a³ g
3. Cρ_L h g
4. Dρ_L a g

As printed in the paper