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ugljenog praha
A coal that has been crushed to a fine dust in a grinding mill. It is blown into the combustion zone of a furnace and burns very rapidly and efficiently.
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sila
Subjekt koji, kad je primijenjen na masu, uzrokuje njeno ubrzanje. Drugi zakon gibanja Sir Isaaca Newtona kaže: jačina sile = masa * akceleracija.
