Astronomy: Explaining Why Stars on Top Left of Main Sequence Spend Less Time

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Stars on the top left of the main sequence, typically more massive and hotter, have higher rates of nuclear fusion, leading to faster consumption of their hydrogen fuel. In contrast, stars on the lower right are less massive and cooler, allowing them to sustain hydrogen fusion for a longer duration. The difference in mass and temperature directly influences their lifespans on the main sequence, with more massive stars having significantly shorter lifetimes. This phenomenon is a fundamental aspect of stellar evolution and is well-documented in astrophysics. Understanding these differences is crucial for studying the life cycles of stars.
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Hi, I was just wondering if anyone could help me with this question. I couldn't find anything on the internet.

Q12 Explain why a star on the top left of the main sequence will spend much less time on the main sequence than another star on the lower right
 
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Nothing at all? How hard did you look?
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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