<span>A substance that cannot be divided into smaller substances by chemical means is called an Element. (gold, iorn,ect...)
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The independent variable is how much weight you add to the boat.
The dependent variable is: Did it or did it not sink yet ?
Answer:
![1.25\ \mu\text{g/m}^3](https://tex.z-dn.net/?f=1.25%5C%20%5Cmu%5Ctext%7Bg%2Fm%7D%5E3)
Explanation:
v = Velocity of the breeze = 4 m/s
w = Width of the valley = 5000 m
h = Height of the valley = 1000 m
Volumetric flow rate is given by
![\dot{V}=vwh\\\Rightarrow \dot{V}=4\times 5000\times 1000\\\Rightarrow \dot{V}=2\times10^{7}\ \text{m}^3/\text{s}](https://tex.z-dn.net/?f=%5Cdot%7BV%7D%3Dvwh%5C%5C%5CRightarrow%20%5Cdot%7BV%7D%3D4%5Ctimes%205000%5Ctimes%201000%5C%5C%5CRightarrow%20%5Cdot%7BV%7D%3D2%5Ctimes10%5E%7B7%7D%5C%20%5Ctext%7Bm%7D%5E3%2F%5Ctext%7Bs%7D)
= Mass flow rate of pollutant = 25 g/s = ![25\times 10^6\ \mu\text{g/s}](https://tex.z-dn.net/?f=25%5Ctimes%2010%5E6%5C%20%5Cmu%5Ctext%7Bg%2Fs%7D)
Concentration is given by
![C=\dfrac{\dot{m}}{\dot{V}}\\\Rightarrow C=\dfrac{25\times 10^6}{2\times 10^7}\\\Rightarrow C=1.25\ \mu\text{g/m}^3](https://tex.z-dn.net/?f=C%3D%5Cdfrac%7B%5Cdot%7Bm%7D%7D%7B%5Cdot%7BV%7D%7D%5C%5C%5CRightarrow%20C%3D%5Cdfrac%7B25%5Ctimes%2010%5E6%7D%7B2%5Ctimes%2010%5E7%7D%5C%5C%5CRightarrow%20C%3D1.25%5C%20%5Cmu%5Ctext%7Bg%2Fm%7D%5E3)
The steady state concentration of pollutants in the valley, is
.
Answer:
there are as many atoms in a normal breath of air as there are breathfuls of air in the atmosphere of the world
Explanation: