Compound axial member ABC shown in Figure Q-9 has a uniform diameter d = 37.5 mm. Q-9 Segment (1) is an aluminum [E1 = 68.9 GPa] alloy rod with length L1 = 2250 mm. Segment (2) is a copper [E2 = 117.13 GPa] alloy rod with length L2 = 3250 mm. When axial force P is applied, a strain gage attached to copper segment (2) measures a normal strain of ɛ2 = 2,100 µ m/m. in the longitudinal direction. Determine the total elongation of member ABC.

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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.