mecanique Flashcards

1
Q

Unite systeme universel

A

m, kg, s, K, mol, A

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2
Q

1 bar en mmHg

A

=760mmHG

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3
Q

°C à Kelvin

A

°C + 273,15

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4
Q

constante de Coulmb

A

K= 9*10^9

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5
Q

constante des gaz parfait

A

R=8,314JK^-1mol^-1

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6
Q

masse d’un proton
neutron
éléctron

A

10^-27kg
10^-27kg
10^-31kg

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7
Q

constante d’avocadro

A

Na=6,022*10^23 mol^-1

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8
Q

vitesse de la lumière dans le vide

A

3,00 * 10^8 m/s

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9
Q

rotation = pulsation

A

w= sigma/ temps =rad/s (tour/ min)

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10
Q

ln(10)

ln(2)

A

=2,3

=0,3

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11
Q

log(10)

log(2)

A

1

0,7

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12
Q
derivé
x^n
u^n
cos(u)
sin(u)
ln(u)
e^u
A
x^n=nx^n-1
u^n=nu'u^n-1
cos(u)=-u'sin(u)
sin(u)= u'cos(u)
ln(u)= u'/u
e^u= u'e^u
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13
Q

force de frottement

A

f=- lambda*v

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14
Q

force de rappel élastique (ressort)

et le travail

A
F = -k ( l-lo) vex
W= -1/2 kx2
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15
Q

la cinématique

A

≠ dynamique (s’interresse au cause du mouvement= les forces)

décrit la manière dont un corps se déplace dans l’espace en fonction du temps

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16
Q

une force conservatrice

A

ne dépend pas du chemin suivi
elle derive alors d’une énergie potentiel

F=-vgrad*EP
F= -dEp/dx * vex

17
Q

théorme energie potencielle

A

deltaEp= Ep1 -Ep2 = -W(f)

18
Q

position d’equilibre

A
le min d'energie potentiel 
dEp(req)/dr =0
si dEP(req)/dr > 0 : stable
si dEP(req)/dr < 0 : instable
19
Q

la puissance

A
P= E/ to
P= W/ t = (vF. vAB) /t = vF .vv
20
Q
vitesse final (sans frottement ni vitesse initiale)
vf
A

Vf= racine 2gH