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Q.

A balloon filled with hydrogen has a volume of 500 litres and a mass of 12kg . What would be the volume of a block of very light material which it can just lift? One litre of material has a mass of 50 g (Density of air=1.3 g/litre )

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a

3 lit

b

4 lit

c

5 lit

d

6 lit

answer is A.

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Detailed Solution

(500+m)g=500×1.3g⇒500+m=650⇒m=150                 Density of the material=mV=501=50                Volume of the material=15050=3lit
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