11th Class Physics Chapter 6 Fluid Dynamics Short Questions Answer
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As a drag force ‘F’ on a sphere of radius ‘r’ moving slowly with speed ‘v’Through a fluid of viscosity ‘π’ is given by stoke ,s law as under,
According to the formula ,the drag force depends upon the following factors:-
1.Speed the sphere
2.Radius of sphere
3.Co. efficient of viscosity
Note:- Terminal velocity is given by the formula
Vt=mg/6πɳr i.e vt α mg
It shows, smaller the weight of sphere,smaller will be the terminal velocity
According to the relation of Bernoulli’s theorem
P1 ⁺1/2pv12=P2+1/2 pv22
Co-efficient of viscosity of the liquid is a defined as the tangential force per unit area required to maintain a unit relative velocity between its two layers. At unit distance apart.
Mathematically, it is expressed by a formula as given below
Where F is opposing tangential force is distance between two layers, A is surface area and v is velocity .
Its SI Unit:-
Its unit is kg m-1s-1
Bernoulli’s equation states that the sun of pressure, the kinetic and potential energies per unit volume in a steady flow of sun incompressible and non-viscous (fristionless) fluid remains constant at every points of its path.
Mathematically, it is expressed as
P+1/2 pv2 +pgh=Constant
Where ‘p’ is the pressure and v is the velocity and ‘h’ is the height of fluid under consideration of its path p is the density and ‘g’ is the acceleration due to gravity
(2) Left on an Aero plane:-
Bernoulli’s effect is applicable to the left of an aero plane. The wings of an aero plane are designed to deflect the air so that the streamline are close together above the wing than below it. Thus, the air is faster on the upper side of wing than on the lower. The
pressure will be lower at the top of wing and as the wing will be forced upward
A high speeds the force is no longer proportional to speed. But FαV2,Therefore,the stock’s law is not applicable at high speed.
Mathematically it is expressed as
A well –known venture ,s relation is expressed as
which is used in Venturi-meter.
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