A soap bubble is blown to a diameter of 7 cm If 36960 erg of work is done in - Physics - Mechanical Properties Of Fluids

Question

A soap bubble is blown to a diameter of 7 cm If 36960 erg of work
is done in blowing it further, find the new radius The surface
tension of soap solution is 40 dyne/cm

Decoder_2 · Accepted Answer

Dear student,Work done in blowing a soap bubble =T×8π(R2final-R2initial)RFINAL=?Rinitial=3
5cmT=40dyne/cmWork done=36960ergPutting these values in formula we  get,36960=40×8π(R2final-(3
5)2)⇒R2final=36 78-12 25⇒Rfinal=4 95cmRegards

A soap bubble is blown to a diameter of 7 cm. If 36960 erg of work is done in blowing it further, find the new radius. The surface tension of soap solution is 40 dyne/cm.