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Q.

A balloon contains 400m3 of hydrogen. The mass of the balloon without hydrogen is 34kg. Its net lifting ability is (in kg.wt.)

 (Density of hydrogen = 0.09 kg/m3 ; Density of air = 1.3 kg/m3)

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answer is 450.

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Detailed Solution

Mass of hydrogen =0.09×400=36kg

Net lifting ability  =FB−mg=Vρg−mg

(Total)m =36+34=70kg

=400×1.3g−70×g

=450g=450kgwt

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