A nylon [E = 2.48 GPa; v = 0.4] rod (1) having a diameter di = 50 mm. is placed inside a Q-5 steel [E = 200 GPa; v = 0.29] tube (2) as shown in Figure Q-5. The inside diameter of the tube is d = 55 mm. An external load P is applied to the rod, compressing it. Determine the value of P that will cause the space between the rod and the tube be closed.

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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.