6_Dynamics 11ed Manual - Engineering Mechanics Dynamics...

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Engineering Mechanics - Dynamics Chapter 12 v max max 3 at 0 2 2 bt 0 + c + 3 f 2 2 f + c + , 3 cr 2 2 cr + c + , () = v max 135 ft s = * Problem 12-8 From approximately what floor of a building must a car be dropped from an at-rest position so that it reaches a speed v f when it hits the ground? Each floor is a distance h higher than the one below it. (Note: You may want to remember this when traveling at speed v f ) Given: v f 55 mph = h 12 ft = g 32.2 ft s 2 = Solution: a c g = v f 2 02 a c s + = H v f 2 2 a c = H 101.124 ft = Number of floors N Height of one floor h 12ft = N H h = N 8.427 = N ceil N = The car must be dropped from floor number
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This note was uploaded on 08/16/2011 for the course EGN 3321 taught by Professor Christianfeldt during the Spring '08 term at University of Central Florida.

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