Question

calculate the work done in blowing a soap bubble of radius 3cm in air.the surface tension of soap is0.025 N/m

Answer 1

Given:

Radius,

r = 3 cm

Surface tension,

T = 0.025 N/m

To find:

Work done = ?

Solution:

As we know,

Work done = $8 \pi r^2 T$

By substituting the given values, we get

                  = $8\times 3.14\times 9\times 0.01\times 0.025$

                  = $0.05652 \ Joule$

Thus, the work done will be "0.05652 J".