Question

If the terminal speed of a sphere of gold (density = 19.5kg/m³) is 0.2m/s in a viscous liquid (density = 1.5kg/m³) find the terminal speed of a sphere of silver (density 10.5kg/m³) of the same size in the same liquid

(a) 0.2m/s 

(b) 0.4m/s

(c) 0.133m/s 

(d) 0.1m/s.

Answer 1

(d) : Terminal velocity = v
viscous force upwards = weight of sphere downwards