Question

A block floats in a container filled with water and this system is placed in an elevator. Choose the correct option(s).

• A. Buoyant force increases as lift accelerates up
• B. Buoyant force decreases as lift accelerates up
• C. Buoyant force remains constant as lift accelerates
• D. The fraction of solid submerged in the liquid doesn't change

Answer 1

Answer: (A), (D)

The correct options are
A Buoyant force increases as lift accelerates up
D The fraction of solid submerged in the liquid doesn't change

Buoyant force

$F_B=V{\rho }_b{g}_{eff}$

If lift accelerates,
$g_{eff}=g+a$

$\frac{V_{immersed}}{V}=\frac{{\rho }_b}{{\rho }_{liq}}$

$\therefore$ Volume submerged in water doesnot depend on effective acceleration.