A small spherical body of radius r is falling under gravity in a viscous medium. Due to friction the meduim gets heated. How does the rate of heating depends on radius of body when it attains terminal velocity?

Answer

A, C, D

Explanation

`Rate of heat produced=Fxxv`
`=(6pietarv)v [:' Viscous F=6pietarv]`
`=(6pietar)[2/9 ((sigma-rho)r^2g)/eta]^2`
`[:' Terminal velocity=2/9 ((sigma-rho)r^2g)/eta]`
`rArrRate of heat produced propr^5`