siformule.py

Created by comecp

Created on February 27, 2024

1.46 KB


PERIMETRE
 
carre: P=4*c
rectangle: P= 2*(L+1)
cercle(roue): P=S=PI*D=S=PI*2*R
 
 
AIRE/SURFACE
 
 
carre: A= c*c= c^2 
rectangle: A= L*l 
triangle rectangle: A= L*l/2
triangle:  A= b*h/2
disque(cercle): S=PI*D^2/4= PI*R^2
parallelogramme: A= c*h
losange: A= d*D/2
trapeze: (b+B)*h/2
 
 
VOLUME
 
 
pave droit: V= l*L*h
cube: V= c^3
prisme droit: V= aire base*h
cylindre revolution: V= PI*r^2*h
pyramide: V= aire base*h/3
cone revolution: V= PI*r^2*h/2
boule: V= 4/3*PI*r^3
 
 
ENERGETIQUE
 
 
E. electrique
 
force: U en volt
debit: i en A
Puissance en W : P=U*i
 
 
E. mecanique en rotation
 
force: Couple C en N.m
debit: taux rotation w en rad/s
Puissance en W : P=C*w
 
 
E. mecanique en translation
 
force: Force F en N
debit:  vitesse V en m/s
Puissance en W : P=F*V
 
 
E. hydraulique
 
force: pression p en N/m^2 (pascals)
debit: Q en m^3/s
Puissance en W : P=p*Q
 
 
E. potentielle
 
Ep= m*g*z de pesanteur
Ep= k*f^2/2 d un ressort
 
 
E. cinétique
 
Ek= 1/2*m*V^2 pr solide en translation
Ek= 1/2*J*w^2 pr solide en rotation
 
 
RELATION PUISSANCE - TRAVAIL
 
W= P*t  (t le temps si P constant)
 
 
 
MECANIQUE DES FLUIDES
 
 
THEOREME DE PASCAL:
 
C est la pression du point B a la 
profondeur h dans un fluide de
masse volumique p
 
PB= P0+p*g*h
 
 
THEOREME D ARCHIMEDE:
 
Soit un volume V d un solide
immergé dans un fluide de masse
volumique p
 
Fb= -pgV
 
Fb= poussée d archimede
p= densite du fluide
g= acceleration due a la gravite
V= volume de fluide

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