Answer:
It develops natural resources.
It works to eliminate poverty through development.
Answer:
![\mathbf{\dfrac{\sigma_{mat}}{L} = 3.6 \ ns/ km}](https://tex.z-dn.net/?f=%5Cmathbf%7B%5Cdfrac%7B%5Csigma_%7Bmat%7D%7D%7BL%7D%20%3D%203.6%20%5C%20ns%2F%20km%7D)
Explanation:
From the given information, the LED is operating with a given wavelength of 850 nm or 0.85 μm.
Hence, the material dispersion is ![\dfrac {d \tau _{mat}}{d \lambda } \simeq (80 \ ps / (nm.km) \ )](https://tex.z-dn.net/?f=%5Cdfrac%20%7Bd%20%5Ctau%20_%7Bmat%7D%7D%7Bd%20%5Clambda%20%7D%20%5Csimeq%20%2880%20%5C%20ps%20%2F%20%28nm.km%29%20%5C%20%29)
Now, using the pulse spread formula:
![\dfrac{\sigma_{mat}}{L} = \dfrac{d \tau _{mat} }{d \lambda} \sigma \lambda](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Csigma_%7Bmat%7D%7D%7BL%7D%20%3D%20%5Cdfrac%7Bd%20%5Ctau%20_%7Bmat%7D%20%7D%7Bd%20%5Clambda%7D%20%5Csigma%20%5Clambda)
![\dfrac{\sigma_{mat}}{L} = (80 \ ps/ ( m.km) \ ) \times (45 \ nm)](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Csigma_%7Bmat%7D%7D%7BL%7D%20%3D%20%2880%20%5C%20ps%2F%20%28%20m.km%29%20%5C%20%29%20%20%5Ctimes%20%2845%20%5C%20nm%29)
Thus, the pulse spreading as a result of material dispersion is:![\mathbf{\dfrac{\sigma_{mat}}{L} = 3.6 \ ns/ km}](https://tex.z-dn.net/?f=%5Cmathbf%7B%5Cdfrac%7B%5Csigma_%7Bmat%7D%7D%7BL%7D%20%3D%203.6%20%5C%20ns%2F%20km%7D)
You should use math on your mind and you should balance the bottle
Any object being acted on by gravity has constant acceleration,
and it's the same number for every object.
On Earth, the acceleration of gravity is 9.8 m/s² downward.
That means that an object moving down moves 9.8 m/s faster every
second, and an object moving up moves 9.8 m/s slower every second
(and eventually runs out of upward gas and starts moving downward).
At the top of its path, the rock's velocity changes from upward to downward.
If you change from upward velocity to downward velocity, the change
has to be smooth ... There's no way to jump from upward to downward
without going through every value in between. There has to be a split
second when you're not moving upward OR downward. At that split
second, your velocity is zero.