Q.

Weight of an empty balloon is W1. Air of weight W is filled in the balloon and weight of the air filled balloon is W2. If the air inside the balloon has the same density as the outside air, then

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a

W2=W+W1

b

W2=W1

c

W2=W1-W

d

W2=WW1

answer is B.

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Detailed Solution

Since buoyant force cancels the weight of air W, we can conclude W1=W2
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Weight of an empty balloon is W1. Air of weight W is filled in the balloon and weight of the air filled balloon is W2. If the air inside the balloon has the same density as the outside air, then