Question A4a)A star has a temperature T = 15000K, mass M = 0.25M and luminosity L = 0.02L.Sketch the position of this star on the Hertzsprung-Russell diagram relative to the mainsequence.b) Using the given properties of the star, derive expressions for the star's radius R and meandensity p. Calculate values for these in units of R. and kg m-³, respectively.c) Starting from the equation for hydrostatic equilibrium, derive an approximate expression forthe central pressure Pc of the star in terms of its density p and radius R, assuming uniformρdensity.d) Assuming that the star is made of ordinary gas material such as the Sun, calculate anestimate of the central temperature of the star. From this value and the luminosity, brieflyexplain what can be inferred about the nuclear processes in the star. Discuss very brieflywhy your estimate for the central temperature may be too large.

**4.4.A circular clarifier has a diameter of 60 ft. If the primary effluent flow is 2 MGD, what is…

Answered: Question A4 a) A star has a temperature…

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Homework help What is the main sequence lifetime of a star with initial mass 3.67 times the Sun's mass?
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