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Is viscosity a vector?

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प्रश्न

Is viscosity a vector?

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उत्तर

 Viscosity is not a vector quantity. It is a scalar quantity because viscosity is a property of liquid as it does not have any direction.

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पाठ 10: Mechanical Properties of Fluids - Exercises [पृष्ठ ७४]

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एनसीईआरटी एक्झांप्लर Physics Exemplar [English] Class 11
पाठ 10 Mechanical Properties of Fluids
Exercises | Q 10.11 | पृष्ठ ७४

संबंधित प्रश्‍न

Fill in the blanks using the word(s) from the list appended with each statement

Viscosity of gases. .. with temperature, whereas viscosity of liquids . . . with temperature (increases / decreases)


Fill in the blanks using the word(s) from the list appended with each statement

For solids with elastic modulus of rigidity, the shearing force is proportional to . . . , while for fluids it is proportional to . .. (shear strain / rate of shear strain)


Explain why The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection


(a) What is the largest average velocity of blood flow in an artery of radius 2 × 10–3 m if the flow must remain laminar? (b) What is the corresponding flow rate? (Take viscosity of blood to be 2.084 × 10–3 Pa s).


In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0 × 10–5 m and density 1.2 × 103 kg m–3? Take the viscosity of air at the temperature of the experiment to be 1.8 × 10–5 Pa s. How much is the viscous force on the drop at that speed? Neglect buoyancy of the drop due to air.


A spherical ball is dropped in a long column of a viscous liquid. The speed of the ball as a function of time may be best represented by the graph 


Water flows at a speed of 6 cm s−1 through a tube of radius 1 cm. Coefficient of viscosity of water at room temperature is 0.01 poise. Calculate the Reynolds number. Is it a steady flow? 


With an increase in temperature, the viscosity of liquid and gas, respectively will __________.


Distinguish between streamlined flow and turbulent flow.


Define terminal velocity.


A block of Ag of mass x kg hanging from a string is immersed in a liquid of relative density 0.72. If the relative density of Ag is 10 and tension in the string is 37.12 N then compute the mass of Ag block.


Choose the CORRECT statement.


Analogy

Viscous force: ______:: Buoyant force: ______.


A spherical solid ball of volume V is made of a material of density ρ1. It is falling through a liquid of density ρ2 (ρ2 < ρ1). Assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed v, i.e., `"F"_"viscous"`= -kv2 (k > 0). The terminal speed of the ball is ______.


State the formula and S.I. units of coefficient of viscosity.


Define velocity gradient.


The dimensions of coefficient of viscosity are ______.


A water pipe with diameter of 5.0 cm is connected to another pipe of diameter 2.5 cm. How would the speeds of the water flow compare?


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