Question 1. 33 min F3 F4 The figure shows a one-dimensional assembly of springs subjected to forces F at node 3 and F at node 4. Nodes 1, 2, 5 and 6 are fixed. Given the forces F 4 kN and P -5 kN, the stiffness constants k = 320, k = 250, k = 400, k = 320, and k = 400 (all in kN/m), calculate the displacements at nodes 3 and 4 and 4 in mm, and the reaction forces R, R and Rs in N, Enter your answers in the boxes below. The answers are acceptable within a tolerance of 10 N for the forces and 0.1 mm for the displacements. d: mm (3 marks) d4: mm (3 marks) R: N (1 marks) R: N (1 marks) R: N (1 marks) Re: N (1 marks)