Dans une centrale Thermique au charbon, l'energie thermique liberee lors de la combustion complete de 1kg de carbone vaut 20MJ. Dans une centrale thermique liberer par la combustion complete de 1m au cube vaut 35,8 MJ (1MJ=10 puissance 6 J). Question :
A l'aide d'un tableau de proportionnalite, calculer l'energie degage par la combustion de 5 tonnes de charbon puis par la combustion de 25m au cube de methane?

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W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.