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  2. Moving load - Wikipedia

    en.wikipedia.org/wiki/Moving_load

    In computational models, load is usually applied as a simple massless force, [citation needed] an oscillator, [citation needed] or; an inertial force (mass and a massless force). [citation needed] Numerous historical reviews of the moving load problem exist. [1] [2] Several publications deal with similar problems. [3]

  3. Rule of mixtures - Wikipedia

    en.wikipedia.org/wiki/Rule_of_mixtures

    where is the volume fraction of the fibers in the composite (and is the volume fraction of the matrix).. If it is assumed that the composite material behaves as a linear-elastic material, i.e., abiding Hooke's law = for some elastic modulus of the composite and some strain of the composite , then equations 1 and 2 can be combined to give

  4. Mass transfer - Wikipedia

    en.wikipedia.org/wiki/Mass_transfer

    There are notable similarities in the commonly used approximate differential equations for momentum, heat, and mass transfer. [2] The molecular transfer equations of Newton's law for fluid momentum at low Reynolds number ( Stokes flow ), Fourier's law for heat, and Fick's law for mass are very similar, since they are all linear approximations ...

  5. Mass balance - Wikipedia

    en.wikipedia.org/wiki/Mass_balance

    Strictly speaking the above equation holds also for systems with chemical reactions if the terms in the balance equation are taken to refer to total mass, i.e. the sum of all the chemical species of the system. In the absence of a chemical reaction the amount of any chemical species flowing in and out will be the same; this gives rise to an ...

  6. Center of mass - Wikipedia

    en.wikipedia.org/wiki/Center_of_mass

    This toy uses the principles of center of mass to keep balance when sitting on a finger. In physics, the center of mass of a distribution of mass in space (sometimes referred to as the barycenter or balance point) is the unique point at any given time where the weighted relative position of the distributed mass sums to zero.

  7. Molar mass distribution - Wikipedia

    en.wikipedia.org/wiki/Molar_mass_distribution

    The dispersity (also known as the polydispersity index) of a sample is defined as M w divided by M n and gives an indication just how narrow a distribution is. [ 2 ] [ 3 ] The most common technique for measuring molecular mass used in modern times is a variant of high-pressure liquid chromatography (HPLC) known by the interchangeable terms of ...

  8. Hooke's law - Wikipedia

    en.wikipedia.org/wiki/Hooke's_law

    In physics, Hooke's law is an empirical law which states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, F s = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring.

  9. Carothers equation - Wikipedia

    en.wikipedia.org/wiki/Carothers_equation

    M n is the number average molecular weight, M w is the weight average molecular weight, M o is the molecular weight of the repeating monomer unit, Đ is the dispersity index. (formerly known as polydispersity index, symbol PDI) The last equation shows that the maximum value of the Đ is 2, which occurs at a monomer conversion of 100% (or p = 1 ...

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