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Unilorin Post-UTME Physics 2022 (Model questions) Question 6

Question 6

Density and Upthrust

Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density 103kgm−3. [g= 10ms−2]

  1. A.0.8N
  2. B.2.5N
  3. C.0.5N
  4. D.1.0N
Show the answer and explanation

Answer: C (0.5N)

Explanation

Upthrust = ρVg = 1000 × 50 × 10−6 × 10 = 0.5 N.