Engineering
Physics
Surface Tension and Surface Energy
Question
Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly (surface tension of soap solution = 0.03 Nm–1) :
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Solution
W = TΔA
= 0.03 (2 × 4π × (52 – 32) 10–4
= 24π (16) × 10–6
= 0.384 π × 10–3 Joule
≅ 0.4 π mJ