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7. Figure 6 shows a spring which is formed from 20 mm x 2 mm cold drawn steel plate and then hardened. What is

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7. Figure 6 shows a spring which is formed from 20 mm x 2 mm cold drawn steel plate and then hardened. What is the maximum allowable value of the force F, if the hardened steel yields at a shear stress of Ty 290 MPa and we require a safety factor of 3 against yield? F *10 2 20 -30- all dimensions in mm

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