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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A circular ring has inner and outer radii equal to 20 mm and 50 mm respectively Mass of the ring is m = 0.8 g. It gently pulled out vertically from a water surface by a sensitive spring. When the spring is stretched 4 cm from its equilibrium position the ring is on verge of being pulled out from the water surface. If spring constant is k = 0.9 N/m find the surface tension of water.

A circular ring has inner and outer radii equal to 20 mm and 50 mm respectively Mass of the ring is m = 0.8 g. It gently pulled out vertically from a water surface by a sensitive spring. When the spring is stretched 4 cm from its equilibrium position the ring is on verge of being pulled out from the water surface. If spring constant is k = 0.9 N/m find the surface tension of water.

each of radius 2 mm fall through aiir at a terminal velocity of 8 cm/s. If they coalesce to form a single drop n drops of water then the terminal velocity of the combined drop is 32 cm/s. Find n.