1)

F =0Fy=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) = 0N=10 + 149,99 * SEN30 = 0N = 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)

5) Fr=Uk*N ; Fr=0,12*240 ; Fr= 28,8(N)

N T36) 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

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