1. 5-1 FBD
Det Reaction in 5-11
∑Fx=0
RBcos 30-RAsin30=0
RA= 3 RB 1
∑Fy=RBSin30+RACos30-9.8*50=0 2
From1in2
RB=245N
RA=424.35N
5-2

2. ∑Fx=
RACos60-150+Bx=0
∑Fy=
By+360+RASin60=0
∑MB =800+150*3-RA*12*Sin60-RACos60 *3=0
RA=105.12Ib
Bx=22.44Ib
By=-451.027Ib
5-3

3. ∑Fx
Ax=0.6T
∑Fy
Ay-80*9.8+T+0.8T=0
∑MA=2T+2.4T=4312
T=980N
Ay=-980N
Ax=588N
5-5

4. Cx-TCos30=0
Cy-7000+TSin30=0
6000+4000*4-2TCos30-4TSin30=0
T=5894.88N
Cx=5105.18N
Cy=4052.56N
5-6

5. Ax-12/13T=0
Ay-650-1250-5/13T=0
15*15 3T/3+650*7.5 3 +15 3T-5/3-60T=0
T=197.84N
Ax=182.622N
Ay=1976.09N
5-7
Fx=
RB+Ax=0
Fy=
Ay=20Ib
MA
RB-140=0
RB=140Ib

6. Ax=-140Ib
5-8
Fx
RACos45-T-1250=0
Fy=0
RB+1250+T-1250 3=0
MA=
2500sin60*4+4000-3T-10RB=0
T=269.97N
RB=-1185.03N
RA=2149.56N
5-9

7. FX
Rcsin30+RB-RA-10cos30=0
Fy=
RcCos30-10sin30=0
Mc
10sin30*3-10cos30*13-5RA-3tan30*RB=0
RA=-12.91N
RB=-74.53N
RC=5.773N
5-10

8. Fx
Cx+3RA/ 13=0
Fy=
Cy-2RA/ 13=500
Mc=
-500*4+18RA/ 13=0
RA=400.66Ib
RB=400.66Ib
Cx=-333.33Ib
Cy=722.246Ib
5-19

9. 5-20
5-21