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Category > Physics Posted 20 Apr 2017 My Price 4.00

The sun

The sun has a mass of 1.99E30 (kg) and is located 1.5E11 (m) from the earth. The average energy per unit time per unit area that reaches the earth's upper atmosphere from the sun is 1.35 (kW/m2 ). This energy is released by the sun in a series of fusion reactions that fuse four hydrogen nuclei together to form a single helium nucleus. This process releases 4.27E12 (J) per helium nucleus created. If we assume the sun to be composed of hydrogen and that it will continue to 'burn' until it has consumed 10% of the available hydrogen, estimate the lifetime of the sun. [Answer in units of years.] (Hint: The surface area of a sphere is 4πr2. Work with units to see how to proceed.)

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SuperTutor
(15)
Status NEW Posted 20 Apr 2017 04:04 AM My Price 4.00

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