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Question

The sun generates energy through nuclear fusion, which converts mass into

energy. If the sun radiates 3.8 × 10^{26} W of power, calculate the rate at which the sun loses mass (i.e., kg/s).

_________×10^{9}kg/s ?

Compare the energy produced per kg of fuel for the combustion of coal, d-d fusion and d-t fusion.

d-d: __________ ×10^{7} MJ/kg?

d-t: ___________×10^{8} 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, 3.8×10^{26} W and if its current mass is

1.989×10^{30} kg, what fraction of its original mass has been lost

_____________% ?

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Advanced Physics

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