Question

The sun generates energy through nuclear fusion, which converts mass into
energy. If the sun radiates 3.8 × 1026 W of power, calculate the rate at which the sun loses mass (i.e., kg/s).

_________×109kg/s ?

 

Compare the energy produced per kg of fuel for the combustion of coal, d-d fusion and d-t fusion.
d-d:  __________ ×107 MJ/kg?
d-t:  ___________×108 MJ/kg  ?

 

 

The age of the sun has been estimated at 4.6 billion years. If it has radiated
energy at the same rate throughout its lifetime, 3.8×1026 W and if its current mass is
1.989×1030 kg, what fraction of its original mass has been lost
 _____________% ? 

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