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A spherical ball of density rho and radi...

A spherical ball of density `rho` and radius 0.003m is dropped into a tube containing a viscous fluid , filled up to the 0 cm mark as shown in the figure . Viscosity of the fluid `=1.260 N m ^-2s^-1` and its density `rho_L = rho//2 = 1260 kg m^-3` . Assume the ball reaches a terminal speed by the 10 cm mark. Find the time taken by the ball to traverse the distance between the 10 cm and 20 cm mark . [g = acceleration due to gravity `= 10 ms^-2]`

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