Question

11. Three extension coil springs are hooked in series and support a load of 80 kg. One spring has a spring rate of 0.30 kg/mm. Find the deflection. 512.8 mm 12. A square and ground spring end has a free length of 300 mm. There are 12 active coils with a wire diameter of 13 mm. If the spring rate is 130 kN/m and the mean diameter is 120 mm, determine the solid stress. 2470 MPa 13. What is the length needed to make a helical spring having a mean coil diameter of 1.2 in if there are 10 active coils? 37.7 in 14. A concentric helical spring is used to support a load of 100 kN. The inner spring has a spring rate of 490 kN/m. If initially the inner spring is 20 mm shorter than the other spring, find the percent load carried by the inner spring. 77.7% 15. A spring has a diameter of 30 mm and 15 active coils. If a load of 2 kN is applied and it deflects 80 mm, find the wire diameter of the spring. G=85 GN/m^2 156.4 mm

          11. Three extension coil springs are hooked in series and support a load of 80 kg. One spring has a spring rate of 0.30 kg/mm. Find the deflection. 512.8 mm 
12. A square and ground spring end has a free length of 300 mm. There are 12 active coils with a wire diameter of 13 mm. If the spring rate is 130 kN/m and the mean diameter is 120 mm, determine the solid stress. 2470 MPa 
13. What is the length needed to make a helical spring having a mean coil diameter of 1.2 in if there are 10 active coils? 37.7 in 
14. A concentric helical spring is used to support a load of 100 kN. The inner spring has a spring rate of 490 kN/m. If initially the inner spring is 20 mm shorter than the other spring, find the percent load carried by the inner spring. 77.7% 
15. A spring has a diameter of 30 mm and 15 active coils. If a load of 2 kN is applied and it deflects 80 mm, find the wire diameter of the spring. G=85 GN/m^2 156.4 mm

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