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A 1000 ft. long bridge with a steel superstructure (steel alloy A36) is subjected to seasonal temperature extremes of -40 F to 100 F. (A) How much total expansion joint space must be allowed for to keep the superstructure free from thermal stresses? (B) If the superstructure were welded and stress free at 70F, what thermal stress is developed at -40F?
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A uniform circular disk of mass m = 1 kg and radius R = 0:4m rolls down an incline. Suppose the disk starts rolling from rest. Find the speed of the center-of-mass when the disk is 2m down the inclined plane.
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