A body of density ρ_b is completely submerged in an incompressible liquid of density ρ_l inside an elevator accelerating upward with acceleration a. Neglect drag. Which statements are correct?
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Question

A body of density ρ_b is completely submerged in an incompressible liquid of density ρ_l inside an elevator accelerating upward with acceleration a. Neglect drag. Which statements are correct?

G1 Physics · Accepted Answer

In the elevator frame effective gravity is g+a. Buoyancy equals displaced-liquid apparent weight ρ_lV(g+a), while body apparent weight is ρ_bV(g+a). Their difference gives relative acceleration. Equal densities still give neutral buoyancy.