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The **Schwarzschild radius** (sometimes historically referred to as the gravitational radius) is the radius of a sphere such that, if all the
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Friction velocity, is a form by which a shear stress may be re-written in units of velocity. It is useful as a method in fluid mechanics to compare true ... more

The Rayleighâ€“Taylor instability, or RT instability , is an instability of an interface between two fluids of different densities which occurs when the ... more

Estimate how long it will take to complete a work by two people, from their individual working capacities.

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The pressure inside an ideal (one surface) soap bubble can be derived from thermodynamic free energy considerations. At constant temperature and in ... more

A number of systems exist for the conversion of grades from other countries into German grades. One such system, used by most universities in ... more

The essence of the Fick principle is that blood flow to an organ can be calculated using a marker substance if the following information is known:

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The Dirichlet kernel is a collection of functions and its importance comes from its relation to Fourier series, that decomposes any periodic function or ... more

In mathematics, a 3-sphere is a higher-dimensional analogue of a sphere. It consists of the set of points equidistant from a fixed central point in ... more

Contact mechanics is the study of the deformation of solids that touch each other at one or more points. Hertzian contact stress refers to the localized ... more

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