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# hw01 - would we be able to supply the energy needs of the...

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Homework 1 - Due January 30, 2012 1) Determine the amount of thermal energy of a half liter of water. Hint: you may want to use the fact that one mole of water has a mass of 18 grams. 2) Determine the amount of thermal energy that is in the water in the world’s oceans. Hint: you should look on the internet to find out what is the total mass of water in the world’s oceans. You’ll also need to find out the average temperature of the water in the oceans. Search the internet to find out how the temperature depends upon depth and from that estimate what the average temperature of the water in the oceans is. 3) If we could somehow extract all of the thermal energy in the world’s oceans, how long
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Unformatted text preview: would we be able to supply the energy needs of the US? 4) In class (see the notes for Lecture 2) we determined that if the Earth did not have an atmosphere its average temperature would be 253 K (-4 o ±). However, because of its atmosphere, the average temperature of the Earth is 288 K (60 o ±). Using a similar calculation to what I did in lecture for the case of Venus, estimate what fraction of the energy radiated by the surface of the Earth is trapped by the atmosphere and what fraction escapes to outer space. Physics 140 (Spring 2012) - The Greenhouse Effect...
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