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Question: please show full working for how to get the answers...

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Please show full working for how to get the answers.
A helical compression spring has the following parameters Material: Chrome-vanadium A232 A mean diameter of 75 mm 5 active coils A wire diameter of 8 mm Squared and ground ends (i) What is the inside diameter of the spring? (ii) Estimate the shear strength at yield? (iii)What is the compressive load (accounting for spring curvature) that will permanently deform (yield) the spring?

Answers are:
(I) 67mm
(Ii) 636 MPa
(Iii) 1483 N

I just need to see the working on how to get these answers. Thanks!
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