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Unilorin Post-UTME Physics 2023 (Model questions) Question 8

Question 8

Density and Upthrust

A solid weighs 0.04N in air and 0.024N when fully immersed in liquid of density 800kgm−3. Calculate the volume of the solid

  1. A.2 × 10−6m3
  2. B.2.5 × 10−6m3
  3. C.3.0 × 10−6m3
  4. D.4.7 × 10−6m3
Show the answer and explanation

Answer: A (2 × 10−6m3)

Explanation

Upthrust = 0.04 − 0.024 = 0.016 N = ρVg. So V = 0.016 ÷ (800 × 10) = 2 × 10−6 m3.