 #1
 3
 0
Hello,
I've been studying for the FE, and this question in the Statics section of the review I am going through has really tripped me up for some reason. I understand Statics, and how to determine forces in X and Y directions, determining X and Y components using trig, etc, etc..
Maybe I am overthinking this whole thing, but for some reason this problem has me awfully confused. it's in two parts; first part (not shown) just asks what rxns at A and B are (Ra=Rb=5 kN)
second part (in attached image) asks for the horizontal force in the bottom component. I have the solution there, as well  I just have no idea how the solution was reached. what confuses me, is why do you divide cos(60)/cos(30)? I understand where the 60 and 30 degree angles are from  just not sure why you're dividing the two to get the answer.
any help would be greatly appreciated!
I've been studying for the FE, and this question in the Statics section of the review I am going through has really tripped me up for some reason. I understand Statics, and how to determine forces in X and Y directions, determining X and Y components using trig, etc, etc..
Maybe I am overthinking this whole thing, but for some reason this problem has me awfully confused. it's in two parts; first part (not shown) just asks what rxns at A and B are (Ra=Rb=5 kN)
second part (in attached image) asks for the horizontal force in the bottom component. I have the solution there, as well  I just have no idea how the solution was reached. what confuses me, is why do you divide cos(60)/cos(30)? I understand where the 60 and 30 degree angles are from  just not sure why you're dividing the two to get the answer.
any help would be greatly appreciated!
Attachments

151.4 KB Views: 451