Engineering
Physics
Surface Tension and Surface Energy
Question
The surface tension of water is 75 dyne/cm. Find the minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface. The circumference of the ring is 20 cm and its weight is 0.1 N
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Solution
Freq = mg + 2[T(2πR)] [T = 75 × 10–3 N/m]
= 0.1 + 2 [75 × 10–3 (0.2)] = 0.130 N