Practice Exam 1

# Practice Exam 1 - EM 319 Mechanics of Solids Spring 2011 Exam#1 February 15th 2011 7:00-9:30 pm Closed books notes and homeworks Name EID TA

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EM 319 Mechanics of Solids Spring 2011 Exam #1 February 15 th 2011, 7:00-9:30 pm Closed books, notes and homeworks Name: EID: TA Session: Vishal Nayyar W 4-6 pm 13900 Wei Gao TH 4-6 pm 13905 Adam Sierakowski W 6-8 pm 13910 Andrew Barnes TH 6-8 pm 13915 Formulas: A P , L , E , , T T TL EA PL , dx x T dx x EA x N ) ( ) ( ) (   bx a b dx bx a 1 1 2

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(20 points) A steel bar AD (see Fig. 1) has a cross-sectional area of 0.40 in. 2 and is loaded by forces P 1 = 2700 lb, P 2 = 1800 lb, and P 3 = 1300 lb. The lengths of the segments of the bar are: a = 60 in., b = 24 in., and c = 36 in. a. Assuming that the modulus of elasticity E = 30 x 10 6 psi, calculate the change in length of the bar. Does the bar elongate or shorten? b. By what amount P should the load P 3 be increased so that the bar does not change in length when the three loads are applied? Fig. 1
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## This note was uploaded on 12/14/2011 for the course EM 319 taught by Professor Kennethm.liechti during the Fall '08 term at University of Texas at Austin.

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Practice Exam 1 - EM 319 Mechanics of Solids Spring 2011 Exam#1 February 15th 2011 7:00-9:30 pm Closed books notes and homeworks Name EID TA

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