A balloon whose volume is 300m3 is filled with hydrogen. If the density of air…

Physics JAMB 2012

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]

  • 3000N
  • 3800N
  • 3900N checkmark
  • 4200N

The correct answer is: C

Explanation

F = mg = D x V x g = 1.3 x 300 x 10 = 3900

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