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  4. The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface of water at temperature 20°C is 728 dynes. The surface tension of water is

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Q. The maximum force, in addition to the weight required to pull a wire of $5.0$ cm long from the surface of water at temperature $20^{\circ}C$ is $728$ dynes. The surface tension of water is

Mechanical Properties of Fluids

Solution:

$T = \frac{F}{2l} =\frac{728}{2 \times5}$
$\therefore T =72.8$ dyne/cm
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