Answer: Energy reaches Earth from the Sun at a rate of

Chapter , Problem 75

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Energy reaches Earth from the Sun at a rate of about1300 W/m2. Calculate (a) the total power output of the Sun,and (b) the number of protons consumed per second in thereaction of Eq. 42-8, assuming that this is the source of all theSuns energy, (c) Assuming that the Suns mass of 2.0 X IO30 kgwas originally all protons and that all could be involved innuclear reactions in the Suns core, how long would you expectthe Sun to glow at its present rate? See 74.

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