A raindrop with radius R=0.2 mm falls from a cloud at a height h=2000 m above the ground. Assume that the drop is spherical throughout its fall and the force of buoyance may be neglected, then the terminal speed attained by the raindrop is :[Density of water ρw=1000 kg m−3 and density of air ρa=1.2 kg m−3,g=10 m/s2Coefficient of viscosity of air=1.8×10−5 Nsm−2

A raindrop with radius R=0.2 mm falls from a cloud at a height h=2000

1.	A raindrop with radius R=0.2 mm falls from a cloud at a height h=2000 m above the ground. Assume that the drop is spherical throughout its fall and the force of buoyance may be neglected, then the terminal speed attained by the raindrop is :[Density of water ρw=1000 kg m−3 and density of air ρa=1.2 kg m−3,g=10 m/s2Coefficient of viscosity of air=1.8×10−5 Nsm−2
Answer» A raindrop with radius $R = 0.2 mm$ falls from a cloud at a height $h = 2000 m$ above the ground. Assume that the drop is spherical throughout its fall and the force of buoyance may be neglected, then the terminal speed attained by the raindrop is : [Density of water $ρ_{w} = 1000 {kg m}^{- 3}$ and density of air $ρ_{a} = 1.2 {kg m}^{- 3}, g = 10 {m/s}^{2}$ Coefficient of viscosity of air $= 1.8 \times 10^{- 5} {Nsm}^{- 2}$

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