my_scriptp119.py

Created on April 19, 2022

596 Bytes

p119

calculer les forces
    ->
1/Wab(p))=p*Ab*cos truc bizarre
=800*100*cos(180-90-30)
=4.0*10puissance4 J> 0 travail
moteur
   ->
Wab(R)=R*AB*cos90=0

variation au cours du deplacement

2/ delta Ec=Ecb-Eca
=1/2mv 2 - 1/2mv 2(initialement a l'arret)
      B         A
                  ->     ->     ->
=truc bizarre Wab(f)=Wab(p)+Wab(R)
delta Ec=4.0*10puissance 4 J

enrgie cinetique apres avoir
parcourue 100m

Ecb=deltaEC+Eca=deltaEc
=4.0*10puissance 4 J

vitte apres 100m parcourue

Ecb=1/2mv 2
donc vb=racine Ecb/1/2m
=racine 4*10 puissance 4/1/2*80
=32m/s

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