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JAMB Physics 1997 Question 16

Question 16

Density and Upthrust

A cube of sides 0.1 m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [Density of water is 1000 kg m−3, g = 10 m s−2]

  1. A.1000 N
  2. B.700 N
  3. C.110 N
  4. D.10 N
Show the answer and explanation

Answer: D (10 N)

Explanation

Upthrust = weight of water displaced = 0.001 m3 × 1000 kg m−3 × 10 = 10 N.