Thanks rock.freak667.
i have since found this formula and came out with an answer of 1.25 x 10^6 N/m for the moment required.
this is using a value of 4.637 x 10^-5 for the second moment of area and a young's modulus of 200GPa for the steel.
As the arms at the end of the beam are 1.25m...
Homework Statement
Calculate the force F1 to bend the beam AB to a radius of 7.5m. Assume the beam is a steel tube 200mm OD with wall thickness 20mm. The arm's AC and BD can be assumed rigid.
The force F1 acts on pivots at C and D and is always in the x direction.
Homework Equations...