lucasnumero2.py

Created on December 11, 2021
961 Bytes
psolide=pliquide
Psol=psol*g*Vsol
Fa=pliq*g*Vi

3F=Ps+Fa+R=0

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Exo4:
  P=mtotal*g
   =(mrondin *nb rondin   + mplaque)
  P/pliq*g  =Vi

[mc*g+mp*g+mr*g]=pliq*g*Vi

Exo5:*
decomposez le montage 
Fa1-P1-T=0 ; Fa2+T2-P2=0 ; Fa1+Fa2-P1-P2=0
1)Vsphere(1)=4/3 pi*r1**3
P2sphere=ps*g*Vs
2)Fa2<P2
Fa2=pl*g*Vi
3)PFS(2):Fa2+T2-P2=0
T2=P2-Fa2
4)Vsphere(2)=Vmax-Vmin
P1=ps*g*Vs
5)Fa1-P1-T=0                 T1=T2
Fa1=P1+T
6)Vi=ps*Vs/pl
F=Vi/Vs

Exo6:
1)-Pb+Fa=0
Fa=Pb

pl*g*Vi=ps*g*Vs
pl*  pi*D**2/4  *h   = mpb 
on a aussi po*  pi*D**2/4 *h0 = mpb
po*  pi*D**2/4 *h0 = p*  pi*D**2/4 *h

Po*ho=p*h
p=po* ho/h

2)Vi= Pi/4*D**2*L
3)c=Fa ; G=gravite   (c au dessus de G, sinon retourne)
h=2a    a=10    h<20mm
h/2<a 

Pmax=po * ho/h
    =1000* 200/20 < 10000kg/m**3
    p<10000
4)Phg=13600(mercure)>10000
si notre liquide est du mercure on aura un probleme...

Exo7: 
1)T+Fa-P=0
3)T=P-Fa
  
  Vs=Vi
P=ps*g*Vs
Fa=pliq*g*Vi



Vi=V (sous l'eau)