An empty balloon weighs W1 . If air equal in weight to W is pumped into the balloon the weight of the balloon becomes W2 . Suppose that the density of air inside and outside the balloon is the same

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W2=W1+W

W2=W1W

W2=W1

W2=W1−W

answer is C.

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Detailed Solution

Apparent weight of balloon =w2 Apparent weight =Real weight –up thrustw2=real weight −w ∴w2=w1+w−w ∴w2=w1

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