18 A ring is cut from a platinum tube of 8 5 cm internal and...

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18 A ring is cut from a platinum tube of 8 5 cm internal and 8 7 cm external diameter Its plane is kept horizontal so that it comes in contact with the water in a vessel What is the surface tension of water if an extra 3 97 g force is required to pull it away from water g 980 cm s 72 dyne cm 60 dynelem 2 14 dyne cm 4 36 dyne cm

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