A solid wooden cube has sides of length a. The density of the wood is ρ.
The cube is completely immersed in a beaker of oil, which has a density σ. The top surface of the cube is horizontal. The gravitational field strength is g.
What is the upward force (upthrust) on the cube due to the oil?
[Assume that no oil is absorbed by the wood.]
A. (σ – ρ)a^3g
B. ρa^3g
C. σa^3
D. σa^3g
E. ρa^3