EML3011C, Quiz #10 7/18/06
Name 1 2 Total
20 10 30 1. A beam has the cross section shown below. On a section where the shear force is 75 kN, determine (a) The maximum transverse shear stress. (b) The transverse shear stress at a point that is 20 mm down f
Internal Forces
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world with reaction forc
Procedure for finding Moments of Inertia for composite shapes
1. Break composite shape up into simple shapes.
2. Calculate the area of each simple shape.
3. Calculate I x ' and I y' for each simple shape.
4. Determine what will be the x-axis and y-axis ab
Determining Reaction Forces
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world with r
Trusses MOJ (Method of Joints)
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world wit
Trusses MOS (Method of Sections)
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world w
Appendix 1
Examination centre codes
South Africa Gauteng
Code
Centre
Code
Centre
Code
Centre
3407X
Alberton
33065
Johannesburg (Ormonde)
33316
Randburg
35130
Benoni
31011
Krugersdorp (Greek Church)
33405
Roodepoort (only students
residing in Roodepoort)
3
Chapter Tw o
P sychrom etrics of A ir C ondition Processes
Chapter Two
Psychrometrics of Air Condition Processes
2.1- Psychrometric Chart
Fig.(2.1) Psychrometric chart
It is a graphical representation of various thermodynamic properties of moist air. The
Procedure for finding centroids for composite shapes (made up of several simple shapes)
1.
2.
3.
4.
5.
Identify axes x-, and y- axes)
Break object up into simple shapes.
Calculate the area of each simple shape.
Determine whether each shape has a positive
Procedure for finding centroids for Integrated areas.
1. Select a horizontal or vertical strip for integration. (unless you want to use double integrals
then you are on your own.)
2. Define dA for the selected strip.
3. Find ~ for the selected strip.
x
y