seccion 432 Elias avila Manuel Bravo

1. 1)
F =0
Fy=0 N-p*cos(35)=0 N= 70*cos(35) N= 57,3406 (N)
FX=0 Fr-p*sen (35)=0 Fr= 40,1503 (N) Fr=Ue*N Ue= 40,1503/57,3406 Ue= 0,702
2)
F=0
Fy=0 N-p+F*sen(20)=0 N=m*g-F*sen(20) N= 282,329(N)
Fx=0 -Fr+F*cos(20)=0 Fr= 32,883 (N) Ue=Fr/N Ue=0,116
3) Fy = 0
N – P – F * SEN(30) = 0
N=10 + 149,99 * SEN30 = 0
N = 84,955(N)
4) F=0 Fy=0 0=T1-P*sen(60) ; 0= T1*sen(60) – m*g ; T1= 283,1903 (N)
Fx=0 ; T1-T2*cos(60) ; T2=T1*cos(60) T2= 141,6 (N)

2. 5) Fr=Uk*N ; Fr=0,12*240 ; Fr= 28,8(N)
N T3
6) Fr=N*Ue T
P=200(n) T1
TRABAJAR EN 1
*ΣFY=0
N-P=0 N-P=200(N)
* ΣFX=0
T –Fr=N*Ue=200(N)*0.3
T=60(N)
TRABAJAR EN 2
ΣFY=0
-T1+T3*COS(70)=0
T1-T3*COS(70) A
ΣFX=0
T3*SEN(70)-T=0
T3=
𝑇
𝑆𝐸𝑁(70)
=
60(𝑁)
𝑆𝐸𝑁(70)
= 63,8507(𝑁)
*REEMPLAZAR B EN A
T1=T3*COS(70)
T1=63,8507(N) *COS(70) N
T1= 21,838 (N)
TRABAJAR EN 3

3. ΣF =0
T1 – P =0
T1= P P=T1 = 21,838 (N)
7) Us=0.2 A
55Kg.
55Kg ΣFy 0 = N – M * g T= 539,55(N)
ΣFX = 0
Fr = T
0,2 * N =539,55 N= 2,697,75
Elias Avila Pizarro
Manuel Bravo