Exercice 1 La réaction chimique bilan entre le carbone C dans le
dioxygène O, se fait selon :
C+02
CO2
1) Quel est le combustibles ?
2) Quel est le comburant ?
3) Quel est le produit
4) Quels sont les réactifs ?
5) Comment on peut prouver la présence de ce produit ?
Eroica 3

radiation

explanation:

heat is transmitted by radiation

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

3. dark matter

empty space could also be a simple vacuum

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j