Question

A sphere of mass density 1000 kg/m3 and radius 3 m, contains another sphere of mass density 2000 kg/m3 and radius 1 m inside it, whose center is situated at x=1.5m

Answer 1

Answer:

vT=92ηr2(ρ−σ)g

   =9×1.262×(0.003)2(1260×2−1260)×10

   =0.02 m/s

t=vTd=0.0210×10−2=5 s