Please Help Physics Exercises

[conopiax]

Hello =)

I have a problem with this 2 Physics exercises :confused:

I DID exercise 3 but i dont know if its Good =) if not please do it =D


There is picture with exercises (copy it and paste in IE or Firefox) :

PICTURE: http://img182.imageshack.us/img182/9331/exerciseed2.jpg



Ex3: As weight is carried by a boom-and-cable arrangement, as shown in the diagram. Determine the forces in the cable and the reactions at point A.

Ex 4: In the given structure find the reactions at pionts A, B and C.

pictures from exercises are above in the link i add =)


please help =)


THANKS A LOT =**