Fluid Properties and Hydrostatics (4B) Practice Test

A rigid object is suspended from a force sensor and lowered into a beaker of ethanol ($\rho = 0.79,\text{g/mL}$) until it is fully submerged. The object’s volume is $V = 60,\text{mL}$. Take $g = 9.8,\text{m/s}^2$. Which prediction aligns with buoyancy regarding the force sensor reading after submersion (relative to in air)?

A rigid cube of side length $3.0,\text{cm}$ is fully submerged in a tank containing a uniform fluid with density $\rho = 1200,\text{kg/m}^3$. Take $g = 9.8,\text{m/s}^2$. Which expression is most consistent with the buoyant force on the cube?