question_answer

If a ball of steel (density \[\rho =7.8\,g\,c{{m}^{-3}}\]) attains a terminal velocity of \[10\text{ }cm{{s}^{-1}}\] when falling in a tank of water (coefficient of viscosity \[{{\eta }_{water}}=8.5\times {{10}^{-4}}Pa-s\])  then its terminal velocity in \[(cm{{s}^{-1}})\] glycerine \[(\rho =12gc{{m}^{-3}},\eta =13.2Pa-s)\]would be nearly

Answer:

\[6.25\times {{10}^{-4}}\]