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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 12 - Fluid Mechanics, Surface Tension and Viscosity > A small metal ball of diameter 4 mm and density 10.5 g/cm^3 in dropped in glycerine of density 1.5 g/cm^3. The ball attains a terminal velocity of 8 cm/sec. The coefficient of viscosity of glycerine is

A small metal ball of diameter 4 mm and density 10.5 g/cm^3 in dropped in glycerine of density 1.5 g/cm^3. The ball attains a terminal velocity of 8 cm/sec. The coefficient of viscosity of glycerine is

A straw 6 cm long floats on water. The water film on one side has surface tension of 50 dyn/cm. On the other slide camphor reduces the surface tension to 40 dyn/cm. The resultant force acting on the straw is