Timeline for storing energy (as mass)
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:39 | history | edited | CommunityBot |
replaced http://physics.stackexchange.com/ with https://physics.stackexchange.com/
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| Feb 15, 2012 at 9:19 | comment | added | kartsa | Energy of space decreases by 2000 joules, when I collapse gravitationally downstairs? | |
| Feb 14, 2012 at 8:57 | comment | added | Manishearth | No, it wou ld be 2000 joules. Yes, it would be a billion billion billionth of the energy of space. But its still 2000 joules. A joule is as it is a pretty small unit. Look at it this way: if you move one meter, then in the eyes of the universe, how much do you move? One meter. The fact that one meter is insignificant in thw eyesof the universe is a different matter. | |
| Feb 14, 2012 at 8:41 | history | edited | kartsa | CC BY-SA 3.0 |
added 51 characters in body
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| Feb 14, 2012 at 8:19 | history | edited | kartsa | CC BY-SA 3.0 |
added 1027 characters in body
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| Feb 13, 2012 at 16:32 | comment | added | kartsa | Does general relativity really tell that I can change energy of space by 2000 Joules by walking downstairs? I bet that if we actually calculated the change of energy of space, it would be about billionth of a Joule. | |
| Feb 13, 2012 at 13:03 | comment | added | FrankH | Yes, the mass of the earth is the same. And the mass/energy of the whole system which consists of the earth, you and the mutual gravitational field of you will be constant. However, the energy in the gravitational field will decrease very slightly and your heat energy (and thus your mass) will increase very slightly. Instead of walking, imagine you fell off a high building - your kinetic energy, when you hit the ground will be converted to heat. The mass/energy of the heat came out of the gravitational field. | |
| Feb 13, 2012 at 7:29 | comment | added | kartsa | Mass is conserved, so when I walk down the stairs, mass of earth is unchanged. That is the idea in the first paragraph. Any objections on this? (We consider Kartsa to be part of the Earth) | |
| Feb 13, 2012 at 6:10 | comment | added | FrankH | Sorry, your answer does not make any sense. -1 | |
| Feb 12, 2012 at 23:10 | history | answered | kartsa | CC BY-SA 3.0 |