# Quiz 2 - Hint use the appropriate “magic” formula For...

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QUIZ # 2 Class 4, September 6, 2007 Name _______________________________________ Team__________ PAT (Post Assessment Test) Based on lecture from Class 03 (Week 02 on Enotes) 1. (2 pts) Truss B is more stable than truss A. TRUE FALSE 2. (4 pts) By inspection (do not make any calculations), identify which truss is more stable and explain your answer. 3. (2 pts) A truss is unstable when links are missing. TRUE FALSE 4. (2 pts) A truss is over-constrained when it contains too many links. TRUE FALSE 5. (5 pts) For the trusses below, find out if they are stable, unstable, or over-constrained.

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Unformatted text preview: Hint: use the appropriate “magic” formula: For the 2-D case: 2* J – L – 3 = ? For the 3-D case: 3* J – L – 6 = ? (A) Short brace (B) Long brace (A) (B) 6. (2 pts). In the figure below, a and b are the base and height. Find cosθ. 7. (3 pts) For the two vectors shown, the angle made by the sum of the two vectors with the horizontal is _________? (show your work) a b θ 1 m θ 1 m (A) (B)...
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## This note was uploaded on 04/27/2009 for the course ENGR 111 taught by Professor Walker during the Spring '07 term at Texas A&M.

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Quiz 2 - Hint use the appropriate “magic” formula For...

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