1. Burning one gram of benzene products 4.18x10^4 Joules. The sun\'smass is 2x10

Question

1. Burning one gram of benzene products 4.18x10^4 Joules. The sun'smass is 2x10^30kg and its luminosity is 3.8x10^26 joules/s. If thesun were completely made of benzene and you burned it to producethe solar luminosity, how many years would it last? note earths ageis 4.5billion years.


2. If you could convert 1kg potatoe to energy, how many joules ofenergy would you get? the total electric power consumption averagesabout 1.1x10^9 watt (1 watt = 1joule/s; joule= 1kg m^2 / s^2) howlong could you satisfy the electricity needs if you could harnessthe energy from the potatoe??

3. how long does it take for a red photon from sun to each theearth? how about a blue photon?


thanks in advance

Explanation / Answer

1. This was actually a question astronomers asked longago, when they thought the sun was some fuel that wasburning. .     The sun would be made of   2 x 1033   grams of benzene and it couldrelease .       2 x 1033 * 4.18 x104   =   8.36 x1037 Joules . So it would last for... .       8.36 x 1037 Joules / 3.8 x 1026 J/s =    2.2 x 1011 seconds . There are    3.15 x 107 seconds in one year, so it would last for... .     2.2 x 1011 s / 3.15x 107 s / year =     6984years

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