Question

Find the terminal velocity of a rain drop of radius 0.01mm. Coefficient of viscosity of air is 1.8*10^-5 N-s/m^2 and the density is 1.2 kg/m^3. Density of water= 1000 kg/m^3 .

Answer 1

hey mate
here's the solution

Answer 2

Hello friend,

◆ Answer-
v = 0.0123 m/s

◆ Explaination-
# Given-
r = 0.01 mm = 10^-5 m
ρ = 1000 kg/m^3
ρ0 = 1.2 kg/m^3
η = 1.8×10^-5 Ns/m^2

# Solution -
Terminal velocity of the rain drop is given by -
v = 2(ρ–ρ0)gr^2 / 9η
v = 2(1000-1.2)×10×(10^-5)^2 / (9 × 1.8×10^-5)
v = 0.0123 m/s

Terminal velocity of the raindrop is 0.0123 m/s.

Hope this helps you...