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Q.

A balloon contains 300 m3 of hydrogen. If the mass of balloon without hydrogen is 40 kg. Its net lifting ability is (density of hydrogen=0.09 kg/m3 ) (Density of air=1.3 kg/m3 )

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a

590 kg.wt

b

323 kg.wt

c

70 kg.wt

d

36 kg.wt

answer is B.

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Detailed Solution

MH=dH.VH=0.09×300=27kg          F(↓)=MH g+Mbg Fnet=40+27=67 kg.wt                           FH(↑)=Vda.g=300×1.3×gN=390kg wt∴  Net lifting force =390–67=323 kg wt
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