Acomparison of two things or ideas using the words "like" or "as," such as turning the course of this economic downturn has been like stopping an avalanche; it's possible, but very, very difficult, is a(n) .

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.