5. When unloaded, bars AB and AC are each 36 - in long and have a cross-sectional area of 2 in. Their modulus of elasticity is E = 1.6 x 10° psi. If the weight W = 12,000 lb.(a) what are the changes in length of bars AB and AC, and (b) what is the vertical displacement of A.

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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.