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Show that terminal velocity of a sphere ...

Show that terminal velocity of a sphere falling through a viscous medium is proportional to the square of its radius.

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A spherical object of volume density. The apparent weight of the solid = viscous drag force. Hence the object begins to move with a steady speed called terminal speed.
`6pietaav=4/3 pia^(3) (rho-sigma)g" here"rho gt sigma`
`therefore v=(2a^(2)g)/(9eta) (rho-sigma)`
"Hence" v alpha a^(2)`
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