The random thermal motion of molecules from a region of higher concentration to a region of lower concentration is called diffus
1 answer:
Answer:
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:
where:
- q = quantity of solute
- t = time
- A = membrane surface area
- c = concentration
- D = diffusion coefficient
- dx = membrane thickness
= concentration gradient
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Answer: The force constant k is 10600 kg/s^2
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:
The total energy at the point h=0m is:
The two Energy values are to be equal (by law of energy conservation), which allows us to determine the only unknown, namely the force constant k: