Question
THE TERMINAL SPEED ATTAINED BY AN Al SPERE OF RADIUS 1mm FALLING THROUGH H2O AT 200C WILL BE CLOSE TO ??
ANS 4.6 m/s
(assume laminar flow , specific gravity of Al=2.7 & η H2O =8X 10-4 PL.)
Joshi sir comment
v = 2r2g(D-d)/9η
so v = 2(.001)2*9.8(2700-1000)/9*8*10-5
solve it