Surface tension
Question
The length of one edge of a glass plate of thickness 0.2 cm is 9.8 cm. If this edge of the glass plate touches the surface of a liquid of surface tension 60 dyne/cm, then it is pulled down with a force of (Assume that angle of contact to be zero)
Moderate
Solution
t = 0.2cm; l = 9.8cm; T = 60 dyne/cm
F=T[2(l + t)]= (60)[2(0.2 + 9.8)] = 1200 dyne
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