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

View answer & explanation

Correct answer is C

F = mg = D x V x g = 1.3 x 300 x 10 = 3900

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