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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
F = mg = D x V x g = 1.3 x 300 x 10 = 3900
Source: Myschool Past Questions Archive (Record #27389)