First slide

Surface tension and surface energy

Question

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^oC, is 728 dynes. The surface tension of water is

Moderate

A

7.28 N/cm
B

7.28 dyne/cm
C

72.8 dyne/cm
D

7.28×10² dyne/cm

Solution

$\begin{array}{l} T = \frac{F}{2 l} = \frac{728}{2 \times 5} \\ ∴ T = 72 .8 dyne / cm \end{array}$

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