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Question
A rectangular blade of negligible weight floats on a water surface of surface tension 17×10−1 N/m. If the minimum force to lift up blade from water surface is 2×10–2 N, then find the internal perimeter of blade. [Take a = 10 cm]
A rectangular blade of negligible weight floats on a water surface of surface tension 17×10−1 N/m. If the minimum force to lift up blade from water surface is 2×10–2 N, then find the internal perimeter of blade. [Take a = 10 cm]
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Solution
The correct option is D 6a
ιT=F
⇒(Pi+8a)10−17=2×10−2
⇒Pi=0.6 m
6a
ιT=F
⇒(Pi+8a)10−17=2×10−2
⇒Pi=0.6 m
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