Question
Asked Dec 23, 2019
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A square metal sheet 3.0 cm on a side and of negligible thickness is attached to a balance and inserted into a container of fluid. The contact angle is found to be zero, as shown in Figure P9.49a, and the balance to which the metal sheet is attached reads 0.40 N. A thin veneer of oil is then spread over the sheet, and the contact angle becomes 180°, as shown in Figure P9.49b.The balance now reads 0.39 N. What is the surface tension of the fluid?

Figure P9.49
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Figure P9.49

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Expert Answer

Step 1

The surface tension is

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[1]

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Step 2

The surface tension force is

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F =T,-T, = 0.40N – 0.39N = 0.01N

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Step 3

The perimeter of the ...

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L = 41 10*m = 4| 3.0 cm x- 1cm = 12.0 x10-°m

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Physics