Réponse :
Explications :
■ les Moments donnent :
Fa x 2 = Fb x 50 donc
Fa = 25 x Fb = 25 x 30 = 750 Newton
= 75 daN .
■ pression = 750 Newton/1 cm²
= 75 bars = 75ooo Pascal .
■ Fc = 20 x 75 daN = 1500 daN
■ masse de l' auto = 15ooo Newton / 10 N/kg
= 1500 kg = 1,5 tonne .
