Solution
Free body diagram
B
Ay
Y=6.93m
A 30 D C
0
Ax
12m X=4m
3000N Cy
6.93
Y tan 60 =
tan 30 = X
12 6.93
Y = tan 30 x 12 X =
= 6.93m tan 60
= 4 m
MA = mA
12 =
16
3000 ( ) C y ( )
36000
C =
y
16
= 2250
F = F
A + C = 3000
y
y
A y = 3000 - C y
= 3000 - 2250
= 750N
→
F = F x
x
A x = 0
45