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Calculate the work done in blowing a soa...

Calculate the work done in blowing a soap bubble of diameter 0.6 cm. against the surface tension force. (Surface tension of soap solution `=2.5 times 10^-2 Nm^-1`)

Text Solution

Verified by Experts

Work done = Surface tension (S) `times ` increase of area `(2 times 4 pi r^2)`
`thereforeW=S(4pir^2) times 2`
(since the bubble has two surfaces)
`=2.5/100times4pitimes(0.3/100)^2times2=(20pitimes9)/10^8=(1.8pi)/10^6`
`=5.65 times10^-6J`.
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