Les exercices de MEDE et DENT

~
A~ B~ C
~
A= (−2,−3); ~ B= (3,3); ~ C= (−2,4)
~
D=~ B+~ C~ D= (3 −2,3 + 4) = (1,7)
~
E=~ A−~ C~ E= (−2+2,−3−4) = (0,−7)
~
F=~ A+ 2 ~ C~ F= (−2+2.(−2),−3+2.4) = (−6,5)
~
A~ B~ C
X
A=√4 + 9 = √13, θa= arctan(−3
−2) + 180◦= 236.31◦
B=√9 + 9 = √18, θb= arctan(3
3) = 45◦
C=√4 + 16 = √20, θc= arctan( 4
−2) + 180◦= 116.57◦

F2= 196 N F1= 392 N
50 m/s2
4s
400 m
2400 m
46 s
VX(t)t
X(0) = 5 m
X(8) t= 8 sX(8 s)=0m
X(5) t= 5 sX(5 s)=5m
tt= 2 s
0s < t < 2sa=−5m/s2
6s < t < 8sa= 5 m/s2
!

2,40 m
90 cm
12 m
30 m/s h= 1,6m > 0,9m
20 cm vmin =
23,5m/s
20 cm
d= 16,28 m
12 m
v0θ
v0= 46,49 m/s
θ= 32,84◦
!
◦
T= 40 N
v= 4,16 m/s
1m
5rad/s2
≈0,07 tour 0,220 m

4,4kg
2,2kg
6,6kg
a= 2,33 m/s2, T =
16,87 N, ∆x= 0,655 m
60 kg
◦
◦
T= 232,8N
10 m
◦
5m
x= 5,26 m