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astro hw

# astro hw - 17 kg/sec Assuming that only the 10 of the...

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1. We can figure out the conditions inside the Sun! There are seven unknowns, which characterize the matter in each layer, including temperature, density, pressure, energy generation rate, tec. We also have seven equations from the laws of physics, which connect these seven quantities. State and briefly explain the three most important equations: a. Hydrostatic Equilibrium b. Equation of State (pressure formula) c. How nuclear energy generation depends on density and temperature (for this only a qualitative answer is expected) 2. Consider a main sequence star of mass 60 times the mass of the Sun and a luminosity of approximately 10 6 times the luminosity of the Sun (see table 19-1). At what rate does mass vanish as H is fused to He in the star’s core (4.2 x 10 15 kg/sec)? At what rate is H converted into He (6.0 x 10
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Unformatted text preview: 17 kg/sec)? Assuming that only the 10% of the star’s mass in the central regions will get hot enough for fusion, then calculate the main sequence lifetime of the star. Put your answer in years, and compare to the lifetime of the Sun ( for the 60 solar mass star, 2.0 x 10 13 sec, or only about 625,000 years!). 3. Ch 19: #4, 9, 10 4. Ch 19: #13, 16, 17, 18 5. Visit and look http://antwrp.gsfc.nasa.gov/apod/astropix.html . Go into the archive (click on Discover the Cosmos!) at some pictures, which have descriptions from professional astronomers. Pick two especially beautiful ones and explain them in your own words. You can base your explanation on the text provided, but do not copy any part of it....
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