A helical extension spring is made of 1/8-in music wire A228 (E 28.5 Mps G = 11.75 Mpsi, Sut = 271 kpsi). The mean diameter of the spring body is 1.0 in (spring index 8). The initial tension is 10 Ibf. The maximum external load that the spring can sustain to avoid the yielding of the body is:

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.