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Unformatted text preview: Name EOLUTIOMÂ» ME 270  Fall 2007
Examination No. 1 INSTRUCTIONS .
Begin each problem in the space provided on the examination sheets. If additional space is required, use the yellow paper provided to you. \ Work on one side of each sheet only, with onlyâ€˜ one problem on a sheet. Each problem is worth 20 points. Please remember that for you to obtain maximum credit for a problem, it must be
clearly presented, i.e. . the coordinate system must be clearly identified. . where appropriate, free body diagrams must be drawn. These should be drawn
separately from the given figures. . units must be clearly stated as part of the answer. . you must carefully delineate vector and scalar quantities. If the solution does not follow a logical thought process, it will be assumed in error. When handing in the test, please make sure that all sheets are in the correct
sequential order and make sure that your name is at the top of every page that you wish to have graded. Please circle your instructorâ€™s name and section: Jones Nauman Murphy Nauman 9:3010:20 11:3012:20 9:00â€”10:15 , 2:303:20
Problem 1
Problem 2
Problem 3 Total Name SOLUT/DM ME 270  Fall 2007
Examination No. 1 1a. Given: The tensile forces in wires AB, AC, and AD are 20, 25, and 30 kN,
respectively. Find: Write the force in wire AB pulling on point A as a vector. (5 points) Name Ã©oLuTzoM 1b. Given: Let FA = (i + 5j â€” 3k) N and rAB = (4i â€”j +7k) m. Find: Determine the scalar component Of FA in the direction of rAB. (5 points) B Z Projection:  Z . r7/ N Name 50L 0T! o I\/ 1c. Given: A socket wrench is used to loosen a screw. A 120 N horizontal force is
applied to the handle as shown below. Find: Determine the moment this force creates about point A. Write your
answer in vector form. (5 points) Name Soufï¬‚e/4 1d. Given: Two forcemoment systems. Find: Determine whether or not the two systems are e uivalent. 5 ' W Please circle the correct answer: @ Name 5oLuT/ 0M ME 270  Fall 2007
Examination No. 1 2. Given: A 200 lbs. crate rests on the 50 lbs. pickup tailgate. The center of gravity of
the tailgate is G1 and the center of gravity of the crate is G2. Find: Calculate the tension T in each of the two restraining cables, one of which is
shown. In addition, calculate the reactions at point 0. (20 points) Mo: 0 = \Nz(14Â§+w,(a.53
' Zx+eT â€œâ€œ9 â€œ225) Name SOLUTION ME 270  Fall 2007
Examination No. 1 3. Given: The roof truss show below has a pin support at A and a roller support
at G. Find: Calculate the reactions at A and G. (6 points)
Locate any zero force members. (2 points)
Determine the load carried by member D]. (11 points)
State whether it is in tension or in compression. (1 point) Note: A free body diagram must accompany each equilibrium equation used in your
analysis. In addition, please note that it may require multiple free body diagrams to
solve this problem. ' 6 kip lb) Name Â§OLUTIOM ZQâ€˜VO ENâ€˜CE, AAeJ/â€˜Ate/VS : $814 ) EL. {â€˜4
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 Summer '08
 MURPHY

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