CBSE Class 11-science Physics Mechanical Properties of Fluids
Equation of Continuity
If the fluid velocity > critical velocity, the flow becomes turbulent.
Equation of continuity : Area of cross section times velocity = Constant.
Fluid speed is greater in narrow regions as compared to wider regions.
Bernoulli's Principle: the sum of the pressure, the kinetic energy per unit volume and the potential energy per unit volume remains constant.
Bernoulli's Principle: Applications
2. Venturimeter: Device used to measure the flow speed of an incompressible liquid. Based on Bernoulliandrsquo;s principle.
3. Magnus effect: Curving in the path of the ball introduced due to the difference in pressure above and below the ball.
2. Stokeandrsquo;s law states that the frictional force on a particle is Fd = 6hp Rv
3. Terminal velocity is given by Vs = 2/9[( rp andndash; rf)/h]gR2
Angle of contact : Angle formed between the solid/liquid interface with the liquid/vapour interface.
Surface Tension and Capillarity
2. Excess pressure inside the soap bubble Pi - Po = 4S/r andnbsp;andnbsp;andnbsp;andnbsp;
3. Height of liquid column rising in a capillary tube h = 2Scosandtheta;/andrho;gr
where andrho; is the density of liquid (mass/volume), g is acceleration due to gravity (length/time2) and r is radius of tube (length).
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