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CBSE Class 11-science Answered

Is the following defination of stokes law correct : 
The force that retards a sphere moving through a viscous fluid is directly proportional to the velocity & the radius of the sphere , the viscosity of the fluid.  
 Falphav
Falphar
Falphacoeffecient of viscosity
Asked by sunil | 21 Nov, 2015, 09:58: PM
answered-by-expert Expert Answer
Yes, it is Stoke's law.
Stoke's found that when the body attains terminal velocity, the viscous force on the body is given by,

begin mathsize 14px style straight F equals 6 πηrν end style
where, begin mathsize 14px style straight eta end style, r and v denote the coefficient of viscosity of the fluid, radius of the spherical body and the terminal velocity attained by the body.
Answered by Faiza Lambe | 22 Nov, 2015, 10:59: AM

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