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STATICS: ENGR 2050 — SPRING 2008 EXAM 4 APRIL 18, 2008 ____________________________.——————————————— Instructions: 1. Write your name at the top of every page. 2. Pay attention to what the question is asking. 3. Show all your calculations; draw BRIEF pictures if you need to; state any assumptions. 1. (30 pts) Determine the forces in
members BC, BI, and FG of the
truss with the loading shown. USE
THE METHOD OF SECTIONS to A
do this. Indicate whether the >‘
forces are tensile or compressive A“)
forces. (The support at A is a pin
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EXAM 4 APRIL 18, 2008 2. (35 pts) For the crosssectional area shown bel w (area inside the bold lines):
a. Determine a? for the shape (the Ve/éturca 'stance to the centroid).
b. Determine ffor the shape (the ho}’:%ft‘a distance to the centroid).
c. Locate the centroid on the ﬁgure. Draw a horizontal line through the centroid and label that
thex'axis. Determine the moment of inertia of the area about thex'axis.
cl. Draw a vertical line though the centroid and label that the y ' axis. Determine the moment of inertia of the area about the y'axis. x 1, 1 N u
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EXAM 4 APRIL 18, 2008
3. (35 pts) The compound beam is ﬁxed
supported at C and is supported by rockers
at A and B. If there are hinges (pins) at D
and E, determine the components of reaction at the supports A, B, and C.
Neglect the thickness of the beam. 49'”
For: or E0, i.“ a, EX‘ 9001b ' 5
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A) G 4 334’ 900i» 7 ’ C3 Wig/0'. 400'b(121’€)A:1(10¢€lr%00)5(4fi)~ooo'b(4 $020 if 353:0 ', v 400/1; +3001b'300v’b + 3 “(’001b20: Q40‘bﬂ Bonus: (+3 p13) Answer one of the following: 9 _‘ ””””””” " 1. How many feet are in a mile? 2. What is the relationship between the stiffness of a spring, k, the force in the spring, F5, and the change in length
of a spring if it's subjected to the force F5? Page 3 of 3 ...
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 Spring '08
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 Statics, Force, lowtc‘éwlr Pap U~, WS ft MW

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