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JAMB Physics 2002 Question 10

Question 10

Density and Upthrust

A copper cube weighs 0.25N in air, 0.17N when completely immersed in paraffin oil and 0.15N when completely immersed in water. The ratio of upthrust in oil to upthrust in water is

  1. A.4:5
  2. B.3:5
  3. C.13:10
  4. D.7:10
Show the answer and explanation

Answer: A (4:5)

Explanation

Upthrust in oil = 0.25 − 0.17 = 0.08 N; in water = 0.25 − 0.15 = 0.10 N; ratio 0.08 : 0.10 = 4 : 5.