Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 15

A solid cylinder of density ρ_C, cross-sectional area A and length X is submerged in a liquid of density ρ_L. The upper face of the cylinder is at a depth H below the surface of the liquid, as shown. The acceleration of free fall is g. Which expression gives the magnitude of the upthrust force acting on the cylinder?

1. Aρ_C A H g
2. Bρ_C A X g
3. Cρ_L A H g
4. Dρ_L A X g

As printed in the paper