Choose a discipline of engineering (other than chemical, civil, electrical and mechanical) that is of interest to you. Describe this engineering field and explain how it is an extension of, specialization within, or combination of one or more of the four major engineering disciplines.

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.