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19. Tu peux compresser la boutteile pour que le pression augmente allors le colle se pousse a l'exterieur de la bouteille ()
18 is 100/4=25
70/4=17.5
17.5g de sel d’Epsom doit etre ajoute a 25g d’eau
17.5g sel d'espom ()
17 is Pour l'extérieur du casque, je choisirais un plastique très dur parce qu’il est utilisé dans presque tous les casques sur le marché et il s’est avéré efficace . Pour l’intérieur du timonier, je choisirais la mousse parce qu’elle diminue l’énergie cinétique qui est transférée à votre tête.
16 is
I. C
II. A
III. E
IV. B
V. D
7. vrai
8. faux
9. vrai
10. vrai
11. faux
12. vrai
13. vrai
14. faux
6. Un systeme hydraulique est un systeme ou un liquide est pousse par une pompe dans un tuyaux pour faire bouger l'autre pompe
5. 10 000/5=2000
2000 Pa de pression est necessaire
10000 diviser par 5 = 2000
2000
4. Parce que la molecule ont plus d'espace entre eux alors ils sont plus compressibles
3. 80 x 0.17 = 13.6
l'asstronaute passerait 13.6kg sur la lune
2. d
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