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ENGN 1217 Introduction to Mechanics
Study Period: 15 minutes
Time allowed: 3 hours
Permitted Materials: Normal writing materials, calculators, Text book, one A4 page written
on both sides
Answer All Questions
Answer all questions in script books.
This examination is marked out of 40
1. Determine the force in members CD, CJ, GJ and CG. State if these members are in tension
or compression. (7 marks)
2. Draw the shear and moment diagrams for the beam. (7 marks)
3. The 45-kg disk rests on the surface for which the coefficient of static friction is 0.2A .
Determine the largest couple moment M that can be applied to the bar without causing
motion. (6 marks)
4. Block A has a mass of 50 kg and rests on surface B for which 0.25S . If the coefficient
of static friction between the cord and the fixed peg at C is ' 0.3S , determine the
greatest mass of the suspended cylinder D without causing motion. (6 marks)
5. The concrete “gravity” dam is held in place by its own weight. If the density of concrete is
3 2.5 Mg/mc , and water has a density of
3 1.0 Mg/mw , determine the smallest
dimension d that will prevent the dam from overturning about its end A. (7 marks)
6. Determine the location y of the centroid of the channel’s cross-sectional area and then
calculate the moment of inertia of the area about this axis. (7 marks)
