Question

A body is falling through water with its terminal velocity. Find the visco force when its volume is 50cm^3 and specific gravity is 1.4.

Answer 1

$F=ma\to F_v+\rho_wgV-mg=ma=0\to F_v=mg-\rho_wgV=$

$=\rho V g-\rho_wgV=(\rho-\rho_w)gV=(1400-1000)\cdot9.8\cdot50\cdot10^{-6}=0.196\ (N)$ . Answer