Properties of Matter Part 1

Let Terminal velocity =vt
Upward viscous force = downward weight of sphere
‌⇒6πηrvt=(‌

4

3

πr3)(ρ−σ)g
‌⇒vt=‌

2r2(ρ−σ)g

9η

........(1)
where, ρ= density of substance of a body
σ= density of liquid
Now let the terminal velocity of gold =vg and silver =vS.
From equation (1), we can write

‌∴vs=‌

vg

2

=‌

0.2

2

=0.1