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Universtié d’Ottawa
Faculté de génie
Departement de
génie civil
L’Université canadienne
Canada’s university
GNG 1105
ENGINEERING MECHANICS
University of Ottawa
Faculty of Engineering
Civil engineering
Department
Final Examination
17 December 2018
Profs. A. Skaff, A. Nastic, D. A. Macdonald, M. Noel and
P. Richer
Time: 3 hrs
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Closed Book Examination. Programmable calculators are not allowed.
Free-body diagrams must be drawn where appropriate.
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Problem 1 (16/60)
Mast ABC is being supported by a ball-and-socket
joint at base A and by three cables BE, BG and CD
as shown.
a) Draw the free-body diagram for mast ABC
b) Write the tensions in cables BE, BG and CD in
vector form.
c) If the tension in cable CD is 500 N, determine
the tensions in cables BE and BG.
Problem 2 (11/60)
For the truss shown and assuming that all joints
are pinned,
a) Calculate the reactions at supports A & E.
b) Determine the forces in members CD, GD
and GF using the method of sections. State
whether each member is in tension or
compression.
