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The energy content of coal can vary, but on average, one kilogram of coal contains around 24 megajoules (MJ) of energy.
4 joules = about 1 ton of coal
According to Unit Juggler, 29307600 J are in 1 kg of hard coal. Hope this helps :)
Uranium
The uranium has nuclear energy and the coal has chemical energy. Nuclear is thousands of times more powerful.
3.6 mega joules
Here you must calculate 1 / 0.365.
Exactly one kilogram is in a kilogram.
1 Newton is 1 joule/meter.
1,000,000,000,000 nanograms are in one kilogram.
Joules are the SI unit for energy. One Joule is equal to one kilogram meters squared per seconds squared (kgm2/s2).