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  2. Linear density - Wikipedia

    en.wikipedia.org/wiki/Linear_density

    Consider a long, thin rod of mass and length .To calculate the average linear mass density, ¯, of this one dimensional object, we can simply divide the total mass, , by the total length, : ¯ = If we describe the rod as having a varying mass (one that varies as a function of position along the length of the rod, ), we can write: = Each infinitesimal unit of mass, , is equal to the product of ...

  3. Effective mass (spring–mass system) - Wikipedia

    en.wikipedia.org/wiki/Effective_mass_(spring...

    The effective mass of the spring in a spring-mass system when using a heavy spring (non-ideal) of uniform linear density is of the mass of the spring and is independent of the direction of the spring-mass system (i.e., horizontal, vertical, and oblique systems all have the same effective mass). This is because external acceleration does not ...

  4. Density matrix - Wikipedia

    en.wikipedia.org/wiki/Density_matrix

    The density matrix is a representation of a linear operator called the density operator. ... the Liouville equation of classical physics.

  5. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    The number density (symbol: n or ρ N) is an intensive quantity used to describe the degree of concentration of countable objects (particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volumetric number density, two-dimensional areal number density, or one-dimensional linear number density.

  6. Dimensional analysis - Wikipedia

    en.wikipedia.org/wiki/Dimensional_analysis

    The wire has a linear density ρ (M/L) and is under tension s (LM/T 2), and we want to know the energy E (L 2 M/T 2) in the wire. Let π 1 and π 2 be two dimensionless products of powers of the variables chosen, given by = =.

  7. Matter power spectrum - Wikipedia

    en.wikipedia.org/wiki/Matter_power_spectrum

    Where + is the linear growth factor in the density, that is to first order (,) = + (), and () is commonly referred to as the primordial matter power spectrum. Determining the primordial P 0 ( k ) {\displaystyle P_{0}(\mathbf {k} )} is a question that relates to the physics of inflation.

  8. Poynting vector - Wikipedia

    en.wikipedia.org/wiki/Poynting_vector

    The density of the linear momentum of the electromagnetic field is S/c 2 where S is the magnitude of the Poynting vector and c is the speed of light in free space. The radiation pressure exerted by an electromagnetic wave on the surface of a target is given by P r a d = S c . {\displaystyle P_{\mathrm {rad} }={\frac {\langle S\rangle }{\mathrm ...

  9. List of physical quantities - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_quantities

    Linear density: ρ l: Mass per unit length kg⋅m −1: L −1 M: Luminous flux (or luminous power) F: Perceived power of a light source lumen (lm = cd⋅sr) J: Mach number (or mach) M: Ratio of flow velocity to the local speed of sound unitless: 1: Magnetic flux: Φ: Measure of magnetism, taking account of the strength and the extent of a ...