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JAMB - Physics (2012 - No. 13)
A balloon whose volume is 300m
3
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
Forklaring
F = mg = D x V x g = 1.3 x 300 x 10 = 3900
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