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Q.

A balloon contains 500 m3 of hydrogen. If the mass of the balloon without hydrogen is 30kg.Its net lifting ability is (Density of hydrogen=0.09 kg/m3,  Density of air=1.3 kg/m3 )

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a

375 kgwt

b

475 kgwt

c

575 kgwt

d

675 kgwt

answer is C.

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Detailed Solution

mH=vHdH=500×0.09=45kg Total weight =(mB+mH)g=(30+45)g=75kgwtBuoyancy force on balloon =v dairg                =500×1.3×g=650=650kgwtNet lifting ability=650–75=575 kgwt
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