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Poiseuille’s equation:- when a liquid of coefficient of viscosity flows through, a tube of length ‘I’ and radius r, then the volume of liquid following out per, second is given, , V=nPr8 nl ,, Where P is the difference of pressure between the two ends of the tube., Stoke’s law: The backward dragging force acing on a small sphere of radius, r falling with uniform velocity v through a medium of coefficient of viscosity is, given by, , F =61rnrv, , Terminal velocity:- It is the maximum constant velocity acquired by the body, while falling freely in a viscous medium, The terminal velocity v of a spherical body of radius rand density 6 while, , falling freely in a viscous medium of viscosity | , density is given by, 2 r2, , Vez 7 © pe, Stream line:- It is the path, straight or curved, the tangent at any point to, which given the direction of the flow of liquid at that point, Tube of flow:- A tube of flow is a bundle of stream lines having the same, velocity of fluid elements over any cross section perpendicular to the direction, of flow, Stream line flow:- the flow of the liquid in which each molecule of the liquid, passing through a point travels along the same path and with the some, velocity as the preceeding molecule passing through the same point, Laminar flow:- the flow of liquid, in which velocity of the layer varies from, maximum at the axis to minimum for the layer in contact with the wall of the, tube is called laminar flow., Turbulent flow:- It is the flow of liquid in which a liquid moves with a velocity, greater than its critical velocity. The motion of the particles of liquid becomes, disorderly or irregular., , Material Downloaded From SUPERCOP, , 5/20