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GNG 1105 Final exam solutions fall 2013, Exams of Mechanical Engineering

2013 final exam for GNG 1105

Typology: Exams

2015/2016

Uploaded on 02/17/2016

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GNG 1105 - ENGINEERING MECHANICS
Final Exam Duration: 3 Hour
December 11, 2013 Page 1 of 3
Profs. A. Skaff, Y. Haddad, Ph. Girault, and A. Ahmed
Closed book Examination. Only non- programmable calculators are allowed.
All other electronic devices are not allowed.
Solve ONLY four out of the five problems indicated below.
3m
3m
2m
2m
1m
y
zx
B
C
D
E
A
1.2 KN
Problem1. (25/100)
A 1𝑚 × 2𝑚 sign of uniform density weighs
1.2 KN is held in place by a ball-and-socket
support at point A and by two cables EB and
DC.
a) Write the tensions in cables EB and DC in
vector form.
b) Determine the tensions
in cables EB and DC.
pf3
pf4
pf5
pf8
pf9

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GNG 1105 - ENGINEERING MECHANICS

Final Exam Duration: 3 Hour December 11, 2013 Page 1 of 3 Profs. A. Skaff, Y. Haddad, Ph. Girault, and A. Ahmed Closed book Examination. Only non- programmable calculators are allowed. All other electronic devices are not allowed. Solve ONLY four out of the five problems indicated below. 3m 3m 2m 2m 1m y z x B C D E A 1.2 KN Problem1. (25/100) A 1 𝑚 × 2 𝑚 sign of uniform density weighs 1.2 KN is held in place by a ball-and-socket support at point A and by two cables EB and DC. a) Write the tensions in cables EB and DC in vector form. b) Determine the tensions in cables EB and DC.

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Problem2. (25/100) The truss shown to the right is supported by a pin joint at A and a cable at point B. a) Determine the reaction at A and the tension in BH. b) Find the tension or compression in members FD, GD, and GE by the method of sections. Problem 3. (25/100) Lever ABC is attached to a pin joint at C and to a link BD as shown. A force of 500 N is being applied at point A as shown. a) Draw the free-body diagrams of lever ABC and link BD, as being disassembled from each other. b) Find all the forces acting on lever ABC. Problem4. (25/100) Block A is of mass 20 kg and block B is of mass 5 kg. The coefficient of static friction between block B and the vertical wall and block A and the floor is μs1=0. 30 , and the coefficient of static friction between the two blocks A&B is μs2=0.20. Determine the force P necessary for impending motion of block A. Page 2 of 3

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