Answer:
334.314 (kJ)
Explanation:
1) the formula for the required energy is: Q=c*m(Bp-t), where c - 4100 J/kg*C; m - 0.9 kg; Bp - 100.6 C; t - 10 C.
2) according to the formula above:
Q=4100*0.9*(100.6-10)=41*9*906=334314 (J).
<h2>Answer:</h2>
<u>Blue main Sequence stars have the greater initial mass</u>
<h2>Explanation:</h2>
Blue main sequence stars are the stars with surface temperatures of 20,000 to 50,000 Kelvin and can be 25 times larger than the Sun. They are extremely hot so they have blue color. The best example of this type of stars is Rigel which is the brightest star in the constellation of Orion.
The average energy delivered to a surface is 7.5*10^6J.
To find the answer, we have to know about the poynting vector.
<h3>How to find the average energy delivered to a surface?</h3>
- Energy per time through a unit area perpendicular to the direction of propagation of EM wave is called poynting vector.
- We can write the expression of Poynting vector as,
where; E(avg) is the average energy of the EM wave, and c is the speed of light.
- We can rewrite the expression as per our defenition as,
- Thus, the value of average energy will be,
Thus, we can conclude that, the average energy delivered to a surface is 7.5*10^6J.
Learn more about the poynting vector here:
brainly.com/question/19530841
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