JAMB Physics 2012 Objective — Question 18
Question 18 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2012 Objective paper, with the correct answer and a full explanation.
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A balloon whose volume is 300m³ is filled with hydrogen. If the density of air is 1.3 kgm⁻³, find the upthrust on the balloon. [g≈10ms⁻²]
- A. 3000NB
- B. 3800N
- C. 3900NCorrect
- D. 4200N
Explanation
Upthrust = ρ(air)×V×g = 1.3×300×10 = 3900N.
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