Exam_1_S051

Exam_1_S051 - ME 270 Examination #1 Name February 16, 2005...

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Unformatted text preview: ME 270 Examination #1 Name February 16, 2005 (Print) (Last) (First) PROBLEM #1 120 nointsz Each of the following five sub-problems labeled (a) to (e) is worth either 4 points for the correct answer or zero points for the wrong answer {no partial credit, no matter how trivial the mistake). 1(a) (4 points, no partial credit) For the system shown, write a vector expression for the tension TCD . Assume the tension in the cable is TCD = 1.2 kN. 1(b) [4 noints, no partial credit! For the system shown, determine the moment about pom 0 due to tension T. Assume the tension in the cable is 24 kN, giving a tension vector of TAB = 4.655 e 3.87} w 23.2E kN. Mo: ME 270 Examination #1 Name February 16, 2005 (Print) (Last) (First) 1 (c) :4 HointsI no gartial credit] Two systems of forces and moments act on the beam. Are they equivalent? YES NO System 1 ( circle one] Jr‘ 20 lb! 50 ft-lb —+——2 r1 System 2 L 2n +— 2n 1 l (d) 14 Quinta:= no partial credit! A 400—N force is applied to the welded slendar bar DAB. “What is the maximum moment that the 400-N load could exert at point 0‘? What angle does the force make with the vertical to create this maximum moment? 600 mm ME 270 Examination #1 Name February16.2005 (Print) (Last) (First) 1 (e) 14 pointsI no gartial credit! A snow load transfers the forces shown to the upper joints of a Pratt rooftruss as shown. Use the method ofjainls to determine the load in member DF. lkN ME 270 Examination #1 Name February 16. 2005 (Print) (Last) (First) 100 N ., He“ C/ {30° PROBLEM #2 [20 points! Given: Bar ABC is supported by a fixed support at the wall at A and is in static equilibrium. The bar is loaded with two forces and one couple all of which act in the plane ofthe bar. Find: (3 pts) (:1) Draw a complete Free body diagram of bar ABC. (11 pls) (b) Determine all reactions at fixed support A. (3 pts) (c) Ifthe 300 N-m couple were shifted toward support A, please denote for every reaction at A whether the reaction would (increase, decrease. or remain unchanged)? (No work needs to be shown). (3 pts) (d) Ifthe 200 N force were shifted towards point 8, please denote for eVEry reaction at A whether the reaction would (increase, decrease, or remain unchanged)? (No work needs to be shown). ME 270 Examination #1 Name February 16, 2005 (Print) (Last) (First) PROBLEM #3 [20 points! Given: Truss A-l is loaded with a 1500 lb force as shown and is in static equilibrium. The truss is supported by a pin reaction at jortt E and a rocker support atjoint F. Find: (5 pts) (a) Determine the support reactions at E and F. (12 pts) (b) Using the method ofsecrions, determine the loads carried in members, CD, DH. and GH, and indicate whether each is in compression or tension. (3 pts) (c) Identify by inspection all zero-force members in the truss. (No work needs to be shown). ...
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Exam_1_S051 - ME 270 Examination #1 Name February 16, 2005...

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