The coiled spring has n coils and is made from a  material having a sheat modulus G. Deter...

The coiled spring has n coils and is made from a  material having a sheat modulus G. Determine the stretch of the spring when it is subjected to the load P. Assume that the coils are close to each other so that θ ≈ 0° and the deflection is caused entirely by the torsional stress in the coil.