Unit 2.1 Review Part C

Figure 11 shows the cross sections of three shapes.  What do points A, B and C represent in each?

• centroids
• medians
• mid-points
• yield points

Based on the truss shown in Figure 10, what is the value of the reaction force that occurs in the vertical direction at pin connection A in lbs?

• 10
• 15
• 5
• 40

Using the figure above what is the length of BC?

• 13.05
• 10.36
• -38.11
• 15.56

Moment of inertia is a cross-sectional property that gives the engineer an indication of the stiffness of a particular shape. Its value can be used to:

• calculate the amount of deflection that occurs in structural beams.
• calculate the weight of a structural beam.
  
• locate the centroidal axis of a structural shape.
• describe the linear relationship between stress and strain.

Given an acute angle of a right triangle and the adjacent side which of the following functions would you use to find the opposite side?

• Sin
• Cos
• Tan
• Tan^-1