Physics (AS & A Level) · Oct / Nov 2021 · Paper 13 · Question 15

The diagram shows two blocks X and Y. Block X has sides of length a. When block X is placed in a liquid of density ρ with the shaded face level with the liquid surface, it experiences an upthrust U. Block Y has horizontal sides of length a and 2a and height 1/2 a. Block Y is placed in a liquid of density 2ρ, also with the shaded face level with the liquid surface. What is the upthrust on block Y?

1. A1/2 U
2. BU
3. C2U
4. D4U

As printed in the paper