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JAMB Physics 2011 Question 15

Question 15

Density and Upthrust

An object weighs 22kg in water and 30kg in air. What is the upthrust exerted by the liquid on the object? [g ≈ 10 ms−2]

  1. A.220 N
  2. B.80 N
  3. C.50 N
  4. D.520 N
Show the answer and explanation

Answer: B (80 N)

Explanation

Upthrust = apparent loss of weight = (30 − 22) kg × 10 = 80 N.