Q-10 An aluminum alloy [E = 70 GPa; v=0.33; a = 23.0 x 10-6 /°C] plate is subjected to a tensile load P as shown in Figure Q-10. The plate has a depth d= 260 mm, a cross-sectional area A = 6,500 mm2, and a length L = 4.5 m. The initial longitudinal normal strain in the plate is zero. After load P is applied and the temperature of the plate has been increased by _T = 56°C, the longitudinal normal strain in the plate is found to be 2,950 µm/m (µ).. Determine (a) the magnitude of load P. (b) the change Ad in plate depth.

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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.