An explosion occurs when the timescale for the energy release by some process is much shorter than the timescale on which a system can adjust to damp the energy release process. In the present day Sun, nuclear fusion is a very slow process: on average it takes many billion years for a proton to fuse with another. This timescale is quite temperature dependent, so you might have thought the centre of the Sun might heat up quickly, leading to a runaway "explosion". However, an increase in temperature leads to an increase in pressure that would expand the Sun, reducing the core density and temperature and decreasing the rate of nuclear fusion again. The timescale for the Sun to react in this way is just millions of years, so this acts like a thermostat that keeps the reactions under control.
The body of water that the city of Los Angeles is located on is called the Los Angeles River. It now flows through a concrete channel on a fixed course, since it has been redrawn after many chaotic floods. The river is rarely used however for fresh water for the city, as it is now very polluted and has urban discharge in it's water, so the aqueducts in the city are now used for the fresh water mainly utilized in Los Angeles.
The average temperature of Earth given the solar irradiance is 238.4K.
<h3>How to calculate the temperature?</h3>
The following can be deduced from the information:
Let Earth's albedo =α =0.33
Radius of sun ( Rs) =6.955×10⁵
Value of Boltzmann constant= 5.67×10-⁸
L= 1350
T = average temperature
L= 4σ (Te)⁴ / (1-α)
1 - 0.33 = 4 × 5.67×10-⁸×(T)⁴ / 1350
0.67 × 1350 = 0.0000002268*(T)⁴
(T)⁴ = 3230357142.9
T = 238.4 k
In conclusion, the temperature is 238.4K.
<u>Complete question:</u>
Calculate the average temperature of Earth where the solar irradiance (L) is 1350W/m² and the albedo of Earth is 0.33. Consider Earth to be a perfect black body and the Stefan - Bollzmann constant to be 5.67 × 10^-8 W.
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U_____________W________________V
UV=13
UW=2y-9
WV=y-5
UV=UW+WV
UV=(2y-9)+(y-5)=2y-9+y-5=3y-14
13=3y-14
27=3y
y=27/3=9
Solution is A, y=9
