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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.
Concept: Critical Velocity and Reynolds Number
Explain the phenomena of surface tension on the basis of molecular theory.
Concept: Surface Tension
Obtain an expression for the capillary rise or fall using the forces method.
Concept: Surface Tension
State Stoke’s law and give two factors affecting angle of contact.
Concept: Stokes’ Law
A liquid rises in glass capillary tube upto a height of 2.5 cm at room temperature. If another glass capillary tube having radius half that of the earlier tube is immersed in the same Liquid, the rise of liquid in it will be _______.
Concept: Capillarity and Capillary Action
State the formula for critical velocity in terms of Reynold's number for a flow of a fluid.
Concept: Critical Velocity and Reynolds Number
Eight droplets of water each of radius 0.2 mm coalesce into a single drop. Find the decrease in the surface area.
Concept: Surface Tension
If ‘θ’ represents the angle of contact made by a liquid which completely wets the surface of the container then ______.
Concept: Angle of Contact
Define the coefficient of viscosity.
Concept: Viscous Force or Viscosity
State the formula and S.I. units of coefficient of viscosity.
Concept: Viscous Force or Viscosity
Calculate the work done in blowing a soap bubble to a radius of 1 cm. The surface tension of soap solution is 2.5 × 10−2 N/m.
Concept: Surface Tension and Surface Energy
The dimensional formula of surface tension is ______.
Concept: Molecular Theory of Surface Tension
Why a detergent powder is mixed with water to wash clothes?
Concept: Effect of Impurity and Temperature on Surface Tension
Define the surface energy of the liquid.
Concept: Surface Tension and Surface Energy
Obtain an expression for total kinetic energy of a rolling body in the form
`1/2 (MV^2)[1+K^2/R^2]`
Concept: Definition of M.I., K.E. of Rotating Body
For polyatomic molecules having 'f' vibrational modes, the ratio of two specific heats,Cp/Cv is..........
Concept: Law of Equipartition of Energy
A body of moment of inertia 5 kgm2 rotating with an angular velocity 6 rad/s has the same kinetic energy as a mass of 20 kg moving with a velocity of ......
Concept: Physical Significance of M.I (Moment of Inertia)
The kinetic energy of a rotating body depends upon................
- distribution of mass only.
- angular speed only.
- distribution of mass and angular speed.
- angular acceleration only.
Concept: Definition of M.I., K.E. of Rotating Body
State the theorem of perpendicular axes about moment of inertia.
Concept: Theorems of Perpendicular and Parallel Axes
State an expression for the moment of intertia of a solid uniform disc, rotating about an axis passing through its centre, perpendicular to its plane. Hence derive an expression for the moment of inertia and radius of gyration:
i. about a tangent in the plane of the disc, and
ii. about a tangent perpendicular to the plane of the disc.
Concept: Theorems of Perpendicular and Parallel Axes
