Global climate change is a change in the atmosphere that occurs all over the planet simultaneously. Although these changes have occurred in certain periods in a natural way, we are currently facing global climatic changes caused by human activities, which have inconsequentially modified the natural harmony of climatic conditions.
The climate change we are currently experiencing refers to global warming, where the earth's temperature is increasing on an alarming and worrying scale. Global warming has caused the melting of the polar ice caps, harmed marine life, increased the surface temperature of the oceans, caused droughts and floods, in addition to promoting an abnormal and harmful sensation to living beings.
These changes are the result of the constant use of fossil fuels, deforestation, pollution and other human activities that have degraded nature and the atmosphere. This is because these activities, mainly the use of fossil fuels, promote a large production of carbon dioxide, which, when released into the atmosphere, causes holes in the ozone layer that protects our planet from the sun's rays. With the depletion of the ozone layer, the planet is left unprotected and receives sun rays at harmful intensities.
Therefore, we can conclude that the global climate changes that we are experiencing are the consequences of our own actions and that is why it is our responsibility to repair the damage caused by global warming and to promote measures that reduce it.
The sun is the primary source of light. Other artificial sources are light bulb, torch light and some others. Thats all i can think of.
Answer:
(a) 9.65 mH
(b) doubled
Explanation:
A = 6 cm^2 = 6 x 10^-4 m^2, l = 20 cm = 0.2 m, i = 2.8 A, N = 1600
(a) The formula for the self inductance of a solenoid is given by
L = μ0 N^2 A / l
L = 4 x 3.14 x 10^-7 x 1600 x 1600 x 6 x 10^-4 / 0.2
L = 9.65 x 10^-3 H
L = 9.65 mH
(b) As we observe that the inductance is proportional to the area so if the area is doubled, then inductance is also doubled.
Since the Units presented are not in the International System we will proceed to convert them. We know that,
![1 mi/h = 0.447 m/s](https://tex.z-dn.net/?f=1%20mi%2Fh%20%3D%200.447%20m%2Fs)
So the speed in SI would be
![V=95mi/h(\frac{0.447m/s}{1mi/h})](https://tex.z-dn.net/?f=V%3D95mi%2Fh%28%5Cfrac%7B0.447m%2Fs%7D%7B1mi%2Fh%7D%29)
![V=42.465 m/s](https://tex.z-dn.net/?f=V%3D42.465%20m%2Fs)
The change in frequency when the wave is reflected is
![f'=f(1+\frac{V}{c})](https://tex.z-dn.net/?f=f%27%3Df%281%2B%5Cfrac%7BV%7D%7Bc%7D%29)
Or we can rearrange the equation as
![f' = f + f\frac{V}{c}](https://tex.z-dn.net/?f=f%27%20%3D%20f%20%2B%20f%5Cfrac%7BV%7D%7Bc%7D)
f' = Apparent frequency
f = Original Frequency
c = Speed of light
![f'-f = f\frac{V}{c}](https://tex.z-dn.net/?f=f%27-f%20%3D%20f%5Cfrac%7BV%7D%7Bc%7D)
![\Delta f = f\frac{V}{c}](https://tex.z-dn.net/?f=%5CDelta%20f%20%3D%20f%5Cfrac%7BV%7D%7Bc%7D)
Replacing,
![\Delta f = (10.525*10^9)(\frac{42.465}{3*10^8})](https://tex.z-dn.net/?f=%5CDelta%20f%20%3D%20%2810.525%2A10%5E9%29%28%5Cfrac%7B42.465%7D%7B3%2A10%5E8%7D%29)
![\Delta f =1489.8 Hz](https://tex.z-dn.net/?f=%5CDelta%20f%20%3D1489.8%20Hz)
Since the waves are reflected, hence the change in frequency at the gun is equal to twice the change in frequency
![\Delta f_T = 2 \Delta f](https://tex.z-dn.net/?f=%5CDelta%20f_T%20%3D%202%20%5CDelta%20f)
![\Delta f_T = 2(1489.8Hz)](https://tex.z-dn.net/?f=%5CDelta%20f_T%20%3D%202%281489.8Hz%29)
![\Delta f_T = 2979.63Hz](https://tex.z-dn.net/?f=%5CDelta%20f_T%20%3D%202979.63Hz)
Therefore the increase in frequency is 2979.63Hz
Answer:
I haven’t done this in a while but i think b
Explanation: