Questions and discussion for this lecture live here. Fire away by hitting Reply below 
Surely Ux,2,l = Uy,2 = 0 m yet for the axial force in member A you let Ux,2,l = 1.25x10^-5m.
I do not understand this … ?
Hi @alexboye,
Apologies - the confusion is entirely my fault! When the slide says U_y,2 = 0, this is careless rounding on my part when writing the slides - I’ve rounded it to zero when typing, it should of course be 0.0000125, as per the axial force calculation.
Your understanding is correct, U_x,2,l = U_y,2 in this case.
Seán