A spherical water droplet of radius 5 microns is falling under gravity in air. The density of water is ρw = 1000 kg/m3 and the dynamic viscosity of air at 20°C is η = 1.8 × 10-5 kg/m s . What is the terminal velocity of the droplet?
1
\(3 \times 10^{-3} \, \text{m/s}\)
2
\(1.7 \times 10^{-3} \, \text{m/s}\)
3
\(5 \times 10^{-3} \, \text{m/s}\)
4
\( 1 \times 10^{-2} \, \text{m/s}\)