JAMB - Physics (2012 - No. 13)
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
4200N
Explanation
F = mg = D x V x g = 1.3 x 300 x 10 = 3900
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