Answer: Seastars prey on mussels and shellfish which would otherwise have no other natural predators. Herbivorous fish like the butterflyfish pictured to the left prey on marine algae. Without this crucial predator-prey balance, the algae would over-grow, which would then kill coral, as they compete for the same resources.
Answer:
However, there has to be 2 electrons on the first shell, and 8 on the others.
Explanation:
Hope this helps :)
Answer:
216.52°C
Explanation:
Hi, in this problem we know the total heat transfer is 1000 W.
We need to do know is the surface temperature of the iron.
So we are going to use the equation for radiation heat transfer.
So, we have the next data
A = 0.02 m^2
ε= 0.4
h = 20 W/m2·°C
T_∞ = 20°C.
We can assume that the air temperature is Tsurfaces = 20°C = 293.15 K. The Stefan-Boltzmann constant, σ = 5.670x10-8 W/m^2·K^4.
Remember that we have to use Kelvin temperatures for the convection term
![Q=100W=A[h(Tiron-Tinfinity)+epsilon*Boltzmann(T^4iron-T^4surface)]](https://tex.z-dn.net/?f=Q%3D100W%3DA%5Bh%28Tiron-Tinfinity%29%2Bepsilon%2ABoltzmann%28T%5E4iron-T%5E4surface%29%5D)
![[Q=100W=(0.02m^2)[20\frac{W}{m^2C} (T_(iron)-296.15K))+0.4*5.670x10^-8(T^4iron-(296.15)^4)]=489.674](https://tex.z-dn.net/?f=%5BQ%3D100W%3D%280.02m%5E2%29%5B20%5Cfrac%7BW%7D%7Bm%5E2C%7D%20%28T_%28iron%29-296.15K%29%29%2B0.4%2A5.670x10%5E-8%28T%5E4iron-%28296.15%29%5E4%29%5D%3D489.674)
489.674K⇒216.52°C
Sodium mn2 and po4 makes sodium
Expression: = -1/5(10)
= -10/5 = -2
In short, Your Answer would be: -2
Hope this helps!