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Kitty [74]
3 years ago
8

The random thermal motion of molecules from a region of higher concentration to a region of lower concentration is called diffus

ion. The rate of diffusion across a barrier is defined by Fick’s law of diffusion:_________
Physics
1 answer:
Makovka662 [10]3 years ago
8 0

Answer:

\frac{dq}{dt} =-DA\frac{dc}{dx}

Explanation:

Fick's law of diffusion describes the times course of transfer of matter from a region of high concentration to a region of lower concentration separated by a thin barrier membrane.

Mathematically:

\frac{dq}{dt} =-DA\frac{dc}{dx}

where:

  • q = quantity of solute
  • t = time
  • A = membrane surface area
  • c = concentration
  • D = diffusion coefficient
  • dx = membrane thickness
  • \frac{dc}{dx} = concentration gradient

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‼️‼️ Please help, urgent ‼️‼️ (check photo)
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Step by step:

Use the law of energy conservation. When the elevator hits the spring, it has a certain kinetic and a potential energy. When the elevator reaches the point of still stand the kinetic and potential energies have been transformed to work performed by the elevator in the form of friction (brake clamp) and loading the spring.

Let us define the vertical height axis as having two points: h=2m at the point of elevator hitting the spring, and h=0m at the point of stopping.

The total energy at the point h=2m is:

E_{tot}=E_{kin}+E_{pot}\\E_{tot}= \frac{1}{2}mv^2+mg\Delta h = \frac{1}{2}2000 kg 4^2\frac{m^2}{s^2}+2000kg\, 9.8\frac{m}{s^2}2m=55200\,kg\frac{m^2}{s^2}

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