(a) Draw neat illustrative sketches to bring about the difference between a helical coil tension spring and helical coil compression spring. (b) A helical coil spring is made of round steel wire 6-35 mm in diameter. The mean radius of helix is 31-75 mm, number of complete turns, 12; the spring is close-coiled. If C = 84-36 GN/m², find: (i) The pull required to extend the spring by 25.4 mm, and %3D (ii) The stress in the wire.

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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.