Physics
JAMB 2012
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]
-
A.
3000N
-
B.
3800N
-
C.
3900N
-
D.
4200N
Correct Answer: Option C
Explanation
F = mg = D x V x g = 1.3 x 300 x 10 = 3900
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