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226_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 226_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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220 CHAPTER 2 Axially Loaded Members Solution 2.8-11 Bumper for a mine car k 1120 lb/in. W 3450 lb 7 mph 123.2 in./sec g 32.2 ft/sec 2 386.4 in./sec 2 Find the shortening max of the spring. K INETIC ENERGY JUST BEFORE IMPACT S TRAIN ENERGY WHEN SPRING IS FULLY COMPRESSED U k d max 2 2 KE Mv 2 2 Wv 2 2 g Conservation of energy Solve for max : S UBSTITUTE NUMERICAL VALUES : ; 11.0 in. d max A (3450 lb) (123.2 in./sec) 2 (386.4 in./sec 2 ) (1120 lb/in.) ; d max A Wv 2 gk KE U Wv 2 2 g k d max 2 2 Problem 2.8-12

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226_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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