What is the work done in blowing a soap bubble from a radius of 3 cm to 5cm ? Surface tension of the soap solution is 0.03Nm^(9-1).

What is the work done in blowing a soap bubble from a radius of 3 cm t

1.	What is the work done in blowing a soap bubble from a radius of 3 cm to 5cm ? Surface tension of the soap solution is 0.03Nm^(9-1).
Answer» `0.2pimJ` `2pimJ` `0.4pimJ` `4pimJ` Solution :`W=2TxxDeltaA=2Txx(4piR_(2)^(2)-4piR_(1)^(2))` (There are TWO free SURFACE of soap bubble) `=8piTxx(R_(2)^(2)-R_(1)^(2))` `=8xxpixx0.03[25xx10^(-4)-9xx10^(-4)]` `=8xxpixx0.03xx16xx10^(-4)` `=0.4pixx10^(-3)J` `thereforeW=0.4pimJ`