The structural design method that DOES NOT take into account the safety factors on the design loads is

The plane truss shown in the figure is subjected to an external force P. It is given that P = 70 kN, a = 2 m, and b = 3 m.

The magnitude (absolute value) of force (in kN) in member EF is ________. (round off to the nearest integer)

Which one of the following sets gives the correct values of $${V_B},\,\,{H_B}$$ and $${V_C}$$?

The pin-jointed $$2$$-$$D$$ truss is loaded with a horizontal force of $$15$$ ݇ܰ at joint S and another $$15$$ ݇ܰ vertical force at joint $$U,$$ as shown.Find the force in member $$RS$$ (in $$kN$$ ݇ܰ) and report your answer taking tension as positive and compression as negative. _____________