A rectangular blade of negligible weight floats on a water surface of surface tension 1/7\times10^{-1} N/m. If the minimum force to lift up blade from water surface Is 2 x 10^{-2} N, then find the internal perimeter of blade. [Take a = 10 cm]

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A rectangular blade of negligible weight floats on a water surface of surface tension

×10−1 N/m. If the minimum force to lift up blade from water surface Is 2 x 10−2 N, then find the internal perimeter of blade. [Take a = 10 cm]

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