Estimate the life expectancy of a 20-solar mass, 1000-solar luminosity blue giant.
lifetime= ?? Billion years
Estimate the life expectancy of a 20-solar mass, 1000-solar luminosity blue giant. lifetime= ?? Billion years
1. Given the Sun's lifetime is about 10 billion years, estimate the lifetime of stars with (a)0.2-solar mass, (-5 x 10yr) (b) 3.0 solar mass, (4 x 10 yr) (c)10.0-solar mass x 10 yr) 2. A star is lying 20 pc from the Sun. The star's position on the sky is observed to move 5 arc sec per year relative to background stars. What is the star's transverse (perpendicular to the line of sight) velocity? If the observed red-shift is...
please help me solve these PHYS 122 Explain or justify all answers Astronomy: Stars & Galaxies HOMEWORK Unit III 1) How are the p-p chain and the CNO cycle similar? What kinds of stars have each as their main fusion reaction? 2) What is the underlying physical reason that there is a mass-luminosity relation? Explain. 3) Why does a star's life expectancy depend on its mass? EXPLAIN 4) What are the main sequence lifespans of (a) a 25 solar mass...
In class, we derived an expression for the lifetime of a main sequence star assuming only 10% of the mass can be used as fuel. However, for stars less massive than about 0.5 solar masses, the star is fully convective, and 100% of the mass can be used as fuel, which increases the lifetime by a factor of 10. Use this information and the original lifetime formula to estimate the lifetime of a 0.1 solar mass star. Express your answer...
Suppose the projections of male life expectancy at age 65 years in the United States are summarized in the following table (x = 0 corresponds to 2000). Year, x 0 10 20 30 40 50 Years beyond 65, y 15.6 16.8 17.6 18.9 19.3 20.3 (a) Find an equation of the least-squares line for these data. (Round your coefficients to three decimal places.) y = (b) Use the result of (a) to estimate the life expectancy at 65 of a...
In very rough numbers, galaxies have a mass of 10 billion solar masses (Mo), there are 100 billion galaxies in the Universe, and the Universe is 13 billion light-years in radius. From such estimates, calculate how many protons there are in the Universe, how many electrons, and how many neutrons.
2) (a) Plot, on a log-log scale, the Main Sequence lifetime versus Mass. Use the mass and luminosities for the star types shown on the table below. (b) Also determine a "best-fit straight line" to this data (a best-fit straight line "by eye" is good enough here) with a slope of -2.5 (this was given in the module as a rough, but not bad, approximation to the Mass-Luminosity Relationship. (c) Where does -2.5 fail the worst? (Marks: 6) Note: the...
8. Calculate the HDI given the following information: • Assume life expectancy ranges from 20-80 years and this country has life expectancy of 70. • Adults citizens go to school for 7 years with a maximum of 13 years and minimum of zero • School age children are expected to go to school for 12 years with a maximum of 18 years and minimum of zero. • GNI index uses a minimum of $100, maximum of $75000 and the GNI...
In about 5 billion years, at the end of its lifetime, our sun will end up as a white dwarf, having about the same mass as it does now, but reduced to about 15,000 km in diameter.What will be its density at that stage, in g/cm3
#2 please ! Ro le Astronomy 1F03 Problem Set 3 Thursday, Nov 10th, 2019 Write your answers on a separate sheet and show your work 1. The protesproton chain effectively c erta hyre en into hem according to 4 He. A Helium wus weighs 6.64518 x 10 IT kg and Hydrogen mucha proton) welches 1.67262 x 10 Workout the change in a when I kg of Hydrogen is converted completely into Helium 4. Convert the change in mass Per burning...
USING R- STUDIO: Along with interest rates, life expectancy is a component in pricing financial annuities. Suppose that you know that last year life expectancy was 77 years for your annuity holders. Now you want to know if your clients this year have a longer life expectancy, on average, so you randomly sample n=20 of recently deceased annuity holders to see actual age at death. Using a 5% level of significance, test whether or not the new data shows evidence...