passwella.
Menu

JAMB Physics 1989 Question 12

Question 12

Density and Upthrust

A piece of wood of mass 40 g and uniform cross-sectional area of 2 cm2 floats upright in water. The length of the wood immersed is

  1. A.80 cm
  2. B.40 cm
  3. C.20 cm
  4. D.2 cm
Show the answer and explanation

Answer: C (20 cm)

Explanation

A floating body displaces its own mass of water: 40 g = 40 cm3. Immersed length = 40 ÷ 2 = 20 cm.