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What is the energy required to blow a so...

What is the energy required to blow a soap bubble of radius 5 cm ? ( S.T. of soap solution = `30xx10^-2N/m`.)

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`w = 8piTR^2 = 8 xx 3.14 xx 30 xx 10^-2 xx 25 xx 10^-4`
=`1.884 xx 10^-2 J`
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