/sci/ - Science & Math

OK this time I did it online using this calculator

Entered the units (48mm OD, 3.2mm thickness, L=0.6m), gave me a section modulus 5cm^3.

S = 5 x 10^-6

SigmaY of steel is a little harder to calculate .. I got this http://www.o2scaffold.com/quality.html which gives scaffold steel a min. yield strength of 345MPA
or 345000000N/m^2

So FD/4 now = S x sigma Y
= 1725
FD = 6900
D = 0.6m so F = 11500
F = mg so m = 1173KG

that seems more likely, did I do well bros?

\Delta l = \mid sqrt{5² + y²} - sqrt{9² + y²} \mid

How do I solve this to y =