and notes 3- Filter paper folding Machine in the picture has an extension spring attached to a damper with d= 2 mm and D = 20 mm. The load fluctuates initial tension up to 55N. a. If a second spring is made of the same material and the same number of coils with D2 = 60 mm, find the wire diameter d2 that would be required to give the same spring rate as the first spring. (10) b. Spring is made of music wire A228 with (rm)A = 6.25 mm, (rm)B = 3.75 mm, P = 30N with 150 active coils. Find material properties and initial torsional stress in the wire. (10) c. Find the maximum load when yielding in tension impends at section A. (10) Duration: 120 minutes Ym A B d