A certain star has a mass of $3.1 \times 10^{30}$ kg and radiates energy at the rate of $7.2 \times 10^{26}$ W. (a) At what rate does the star transfer its mass to other forms of energy? (b) What fraction of its original mass has the star lost in this way since it began to burn hydrogen, $5.7 \times 10^9$ y ago?
Added by Caroline S.
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To do this, we need to know the rate at which the star is losing mass. Let's assume that the star is losing mass at a constant rate. Show more…
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