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.
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