00:01
Hello everyone here the given question is calculate the work done in blowing a soap bubble of diameter 0 .6 centimeter again is the surface tension.
00:10
Okay here given that diameter of the soap bubble diameter of the soap bubble equals to 0 .6 centimeters if the diameter is 0 .6 then radius equals to radius r equals to 0 .6 by 2 that equals to 0 .3 centimeter right so here they asked us to find out the work done in blowing a soap bubble okay against the surface tension so work done in blowing the soap bubble work done in blowing a soap bubble is equals to 8 pi r cube t okay so this is the formula so this is the formula to solve that.
01:13
Okay, here, r is the radius of the bubble, r is the radius of the bubble, t is the surface tension, okay? so in the given question, radius r equals to 0 .3 centimeters, and tension t equals to 2 .5 into 10 per minus 2, new 10 per meter, okay? so we have radius and surface tension in the above formula, we have to substitute it.
01:45
Okay, so work done, w equals to, sorry, work done, w equals to 8 pi r square t, okay? that equals to 8 into pi into radius of the, so bubble is 3 into 10 per minus 3 whole square into tension t.
02:07
So the tension t value is 2 .5 into 10 per minus to newton per meter, right? so on solving this we'll get 8 .3 .14 into 9 into 10 power minus 6 into 2 .5 into 10 power minus 2...