Author: Physics Notebook

  • Distinguish Between Streamline And Turbulent Motion With Special Reference Of Reynold’s Number.

    —

    by

    Physics Notebook

    Distinguish between streamline and turbulent motion: If a liquid flows in such a way that its velocity at any point is always the same in magnitude as well as in the direction, then the flow of the liquid is said to be steady or streamline flow. On the other hand, if a liquid flows in…

  • What Is Reynold’s Number? Explain The Significance Of Reynold’s Number.

    —

    by

    Physics Notebook

    Reynold’s Number: Experimentally, it is found that the critical velocity of a liquid depends upon its coefficient of viscosity , density of the liquid , and the diameter of the cylindrical tube into which the liquid flows. Therefore, where, is the dimension less constant called Reynold’s number, a,b,c are dimensionless number to which , and…

  • What is Critical Velocity?

    —

    by

    Physics Notebook

    Critical Velocity: Critical velocity of a fluid is the maximum velocity of flow above which the flow ceases to be streamlined and becomes turbulent.

  • What Do You Mean By Streamline And Turbulent Motion Of A Liquid?

    —

    by

    Physics Notebook

    Laminar or Streamline motion: If a liquid flows in such a way that its velocity at any point in the liquid is always the same in direction as well as in magnitude, then the flow of the liquid is said to be steady or streamline flow. The path followed by the particles of the liquid…

  • What Are Newtonian And Non-Newtonian Liquids?

    —

    by

    Physics Notebook

    Newtonian & Non-Newtonian liquids: The coefficient of viscosity of a liquid is given by , or, . where, is the dragging force acting in contact area of two adjacent layers, is the velocity gradient along the perpendicular direction of the liquid flow. The above equation is known as Newton’s law of streamline motion of the…

  • Define The Units Of Coefficient Of Viscosity In C.G.S. And S.I. Units.

    —

    by

    Physics Notebook

    Poise: If a tangential force of one dyne is required per sq. cm. to maintain a relative velocity of 1 cm/sec between two layers 1 cm. apart, then the coefficient of viscosity is 1 poise. Decapoise: If a tangential force of 1 Newton is required per sq. m. to maintain a relative velocity of 1…

  • Define Coefficient Of Viscosity Of A liquid, Its Dimension And Units.

    —

    by

    Physics Notebook

    Coefficient of viscosity: Let us consider a region of a liquid flowing in streamline motion parallel to the X-Y plane along the positive Y direction. Let us consider two adjacent layers at a distance z and z+dz from the fixed layer above the X-Y plane. The velocities of these two adjacent layers are u and…

  • What Is Viscosity Of A Liquid?

    —

    by

    Physics Notebook

    Viscosity: When the motion of a liquid over a fixed horizontal surface is slow and steady, i.e, when the motion of a liquid over a fixed horizontal surface is streamline, its contact with the fixed surface is stationary and the velocity of each layer increases with its distance from the fixed surface. If any two…

  • Distinguish Between Gravitational Mass and Inertial Mass.

    —

    by

    Physics Notebook

    Mass: The mass of a body is defined as the quantity of matter possessed by the body. There are two different concepts about the mass of a body. (i) Gravitational Mass: The gravitational mass of a body is related to the gravitational force of attraction on the body. It is defined by Newton’s law of…

  • Moon Has No Atmosphere. Why?

    —

    by

    Physics Notebook

    Moon has no atmosphere: At N.T.P. the root mean square velocity for hydrogen molecules and for oxygen molecules are nearly 1.92 km/sec and 0.48 km/sec respectively, for nitrogen slightly higher than this. These are much less than the escape velocity of 11.2 km/sec from the surface of the earth. For this reason, the earth’s atmosphere…