1. | The sun radiates energy at the rate 3.8 10 26 W. The source of this energy is fusion, a nuclear

1. | The sun radiates energy at the rate 3.8 1026
W. The source of this energy is fusion, a nuclear reaction in which mass is
transformed into energy. The mass of the sun is 2.0 1030
kg.

a. How much mass does the sun lose each year?

b. What percent is this of the suns total mass?

c. Fusion takes place in the core of a star, where the
temperature and pressure are highest. A star like the sun can sustain fusion
until it has transformed about 0.10% of its total mass into energy, then fusion
ceases and the star slowly dies. Estimate the suns lifetime, giving your
answer in billions of years.

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