Is the transfer from 2D mechanics to 3D mechanics intimidating?

[Femme_physics]

What? No! There were always only two cords! Can't believe you're suspecting me, is this what our marriage based on?!?

But, seriously, two cords. When did you go on inventing a cord?

 

[I like Serena]

Playing tricks on each other that work out funny? Definitely!

The very first time I looked at the picture I immediately saw a cord between A and D, and I thought: Hey, that's a funny problem!

And when you had the question: "In the solution manual they appeared to have ignored it [Ed. CD]! i.e. not even include it as a vector! This is false, right?"
I drew the wrong conclusion they had removed CD to make the problem solvable.

Looking more carefully at the picture, I guess AD was not intended as a cord.

 

[Femme_physics]

And when you had the question: "In the solution manual they appeared to have ignored it [Ed. CD]! i.e. not even include it as a vector! This is false, right?"
I drew the wrong conclusion they had removed CD to make the problem solvable.

I was referring to Tcdx when I said that! That's what they completely seemed to ignore!

Looking more carefully at the picture, I guess AD was not intended as a cord.

Yea, it's not mentioned in the question, it's just a line to define the shape I guess, but I can see why you got confused!