First slide

Fluid statics

Question

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

Easy

A

$W_{2} = W + W_{1}$
B

$W_{2} = W_{1}$
C

$W_{2} = W_{1} - W$
D

$W_{2} = \sqrt{W W_{1}}$

Solution

Since buoyant force cancels the weight of air W, we can conclude $W_{1} = W_{2}$

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