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The relative velocity between two parallel layers of water is 8 cm/s and the perpendicular distance between them is 0.1 cm. Calculate the velocity gradient.
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A raindrop of radius 0.3 mm falls through the air with a terminal velocity of 1 m/s. The viscosity of air is 18 x 10−6 Ns /m2. Find the viscous force on the raindrop.
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State the formula for critical velocity in terms of Reynold's number for a flow of a fluid.
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What are the two main causes of turbulent flow?
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Define the coefficient of viscosity.
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State the formula and S.I. units of coefficient of viscosity.
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Define velocity gradient.
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An incompressible liquid is flowing through a uniform cross-sectional tube with a velocity 12 cm/ s. If the thickness of liquid layer is 0.8 cm, what is the velocity gradient of that flow of liquid?
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State and explain Newton's law of viscosity.
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A force of 0.01 N is required to move a flat glass plate of area of 10 cm2 with a uniform velocity of 1 cm/ s over the surface of a liquid 2 mm thick. If the coefficient of viscosity of the liquid is 20 poise, the velocity gradient in the liquid layer is ______.
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The dimensions of coefficient of viscosity are ______.
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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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State Stoke’s law and give two factors affecting angle of contact.
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Derive an expression for the terminal velocity of the sphere falling under gravity through a viscous medium.
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State Stokes' law and an expression for the magnitude of the viscous force.
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Explain the continuity condition for a flow tube. Show that the flow speed is inversely proportional to the cross-sectional area of a flow tube.
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Why does the speed of a liquid increase and its pressure decrease when a liquid passes through a constriction in a horizontal pipe?
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Bernoulli's equation for an ideal fluid in streamline flow may be written as
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Bernoulli's theorem is based on the conservation of
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What is the basis of Bernoulli’s principle?
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