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Absence of roughness between two consecu...

Absence of roughness between two consecutive layers of fluid is the viscosity .

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When an object moves through a fluid, as when a ball falls through air or a glass sphere falls through water te fluid exerts a viscous foce F on the object this force tends to slow the object for a small sphere of radius r moving is given by stoke's law, F_(w)=6pietarv . in this formula eta in the coefficient of viscosity of the fluid which is the proportionality constant that determines how much tangential force is required to move a fluid layer at a constant speed v, when the layer has an area A and is located a perpendicular distance z from and immobile surface. the magnitude of the force is given by F=etaAv//z . For a viscous fluid to move from location 2 to location 1 along 2 must exceed that at location 1, poiseuilles's law given the volumes flow rate Q that results from such a pressure difference P_(2)-P_(1) . The flow rate of expressed by the formula Q=(piR^(4)(P_(2)-P_(1)))/(8etaL) poiseuille's law remains valid as long as the fluid flow is laminar. For a sfficiently high speed however the flow becomes turbulent flow is laminar as long as the reynolds number is less than approximately 2000. This number is given by the formula R_(e)=(2overline(v)rhoR)/(eta) In which overline(v) is the average speed rho is the density eta is the coefficient of viscosity of the fluid and R is the radius of the pipe. Take the density of water to be rho=1000kg//m^(3) Q. Blood vessel is 0.10 m in length and has a radius of 1.5xx10^(-2) m blood flows at rate of 10^(-7)m^(3)//s through this vessel. The pressure difference that must be maintained in this flow between the two ends of the vessel is 20 Pa what is the viscosity sufficient of blood?

KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Why tefllon is coated ,the angle of contact between oil and non -stick...

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  2. Why raincoat does not wet in rain ?

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  3. Water rises to a height of 20 mm in a capillary . If the radius of th...

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  4. How the oil lamp produces light through a wick that is lit using a mat...

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  5. Why the moisture is retained in soil when a farm is being plough ?

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  6. Why it is better to wear cotton clothes in summer ?

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  7. Why the refill of marker pen which is used to write on white board is ...

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  8. Why does the water rise in a capillary tube Explain .

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  9. Why does the mercury fall in a capillary tube ?

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  10. A 20 cm long capillary tube is dipped in water The water rises upto 8 ...

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  11. In incompressible flow the density of a fluid changes with time and po...

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  12. Non -viscous flow can be a streamline.

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  13. In a steady flow velocity of the fluid at each point remains identical...

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  14. The Bernoulli equation can be considered to be a statement of the cons...

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  15. The angle of contact between drop of water and material of raincoat is...

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  16. Absence of roughness between two consecutive layers of fluid is the vi...

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  17. If the weight of body is greater than the buoyant force of liquid then...

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  18. Velocity of water at the depth in river is always slow.

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  19. Assertion : For turbulent flow Reynolds number R(e)gt2000. Reason ...

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  20. Assertion : A needle placed carefully placed on the surface of water m...

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