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JAMB Physics 1997 Question 19

Question 19

Density and Upthrust

An empty 60 litre petrol tank has a mass of 10 kg. Its mass when full of fuel of relative density 0.72 is

  1. A.7.2 kg
  2. B.33.2 kg
  3. C.43.2 kg
  4. D.53.2 kg
Show the answer and explanation

Answer: D (53.2 kg)

Explanation

Fuel density = 0.72 × 1000 = 720 kg m−3, so 60 litres (0.060 m3) has mass 43.2 kg. Adding the 10 kg tank gives 53.2 kg.