JAMB Physics 2020 Objective — Question 2
Question 2 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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2. An object of mass 300kg and a density 600kg/m3 was suspended with a string so that half of it is immersed in paraffin of density 900kg/m3. What is the tension in the string? (g=9.8m/s2)
- A. A. 2205N
- B. B. 735NCorrect
- C. C. 3000N
- D. D. 2940N
Explanation
Volume = 300/600 = 0.5m3. Volume immersed = 0.25m3. Upthrust = 900x0.25x9.8 = 2205N. Weight = 300x9.8 = 2940N. Tension = Weight - Upthrust = 2940-2205 = 735N.
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