A soap bubble has a surface tension of s = 3 × 10?4 N/cm

Chapter 3, Problem 208HP

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QUESTION:

Problem 208HP

A soap bubble has a surface tension of s = 3 × 10−4 N/cm as it sits flat on a rigid ring of diameter 5 cm. You now blow on the film to create a half-sphere surface of diameter 5 cm. How much work was done?

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QUESTION:

Problem 208HP

A soap bubble has a surface tension of s = 3 × 10−4 N/cm as it sits flat on a rigid ring of diameter 5 cm. You now blow on the film to create a half-sphere surface of diameter 5 cm. How much work was done?

ANSWER:

Solution  208 HP

Step 1 of 2

We have to find the work done in blowing on the film to create a half-sphere surface of diameter 5 cm.

The work done in blowing on the film to create a half-sphere can be found from the expression.

       

Where,

N/cm

change in the area of the

         soap bubble in m

The expression has in it because the soap bubble has two surfaces.

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