Buoyancy Practice 2
10 problems · instant feedback · full explanations
Buoyant force equals the weight of displaced fluid: F_b = ρgV. An object floats when it displaces its own weight of fluid.
Q1.
Archimedes' principle: the buoyant force equals:
Multiple choice · Easy
Q2.
What is the buoyant force on a 1 m³ block fully submerged in water? (ρ = 1000 kg/m³, g = 9.8.)
Numerical answer (N) · Medium
Q3.
A 400 kg, 0.5 m³ block floats in water. What fraction is submerged?
Multiple choice · Medium
Q4.
Whether an object floats or sinks depends on:
Multiple choice · Easy
Q5.
A 5 kg rock (volume 0.002 m³) hangs submerged in water. What does the scale read? (N)
Numerical answer (N) · Hard
Q6.
Why do steel ships float?
Multiple choice · Medium
Q7.
Hot-air balloons rise because of buoyancy in air.
True / False · Easy
Q8.
Buoyant force increases with depth.
True / False · Medium
Q9.
A hydrometer in denser liquid:
Multiple choice · Hard
Q10.
An 820 kg, 1000 m³ iceberg floats with 80% submerged. What is the water density? (kg/m³)
Numerical answer (kg/m³) · Hard