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Q.

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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a

W2=W1+W

b

W2=W1W

c

W2=W1

d

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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