Economics - Lessons 1 to 3

UPDATE:
Lesson 3
HW on Supply

 Lesson 3 is now available. Plus, there's a HW about Supply. So download it now.

Course Syllabus

Lesson 1

Lesson 2

 The quiz on lesson 1 was already over but I still decided to upload the file as a reviewer for the  Preliminary Examination. The second quiz is scheduled this coming Thursday and the scope are lessons 2 & 3. Unfortunately, lesson 3 is not yet available so let's wait for a day or two.

I've also attached the course syllabus. Check it out also to see specific topics included on each quizzes.

Study well and you'll do good.

Neurotic Anxiousness

 After the last year tragic storm, Ondoy, that hit the Philippines on 26SEP09 I always had the feeling that this year a storm will make the same tragedy to us. Specially these days, that a heavy rain suddenly pours. Maybe because of my own experience that I haven't been able to go home and been stranded somewhere in Manila but fortunate enough to stay at a friend's house.

These photos were taken while we are walking over the Marikina Bridge the morning after the extreme flood made by Ondoy. All places were full of mud and people were cleaning their houses and removing the brownish thing on their properties. I've walked about 5km just to reach our house because there were no jeeps around by that time.

We also passed by a Jollibee outlet that has been devastated by the flood. The mirrors of the store was shattered into pieces and all of their equipments were full of mud. There are a lot of people wandering around, checking their surrounding and looking on what the storm had done on their environment.

Here are views of the river before and after the storm. And it is clearly seen the difference made after the tragedy. Photo of Marikina River on a normal day (Top), and a photo of Marikina River after the storm Ondoy (Bottom).

I wish it won't happen again.

Management- Chapters 1 to 3

Chapter 1
Chapter 2
Chapter 3


 For those who does not have a copy of the presentations of our Management course, kindly click the links above. The three chapters would be the scope of our first quiz that is scheduled on 15JUL10 TH.


Good luck on the quiz.
Study hard!

Kinematics- Velocity Analysis

Topics included in the hand-out:
1. Velocities and Acceleration of Mechanisms
    a. Resolution and Composition
    b. Instantaneous Axis of  Velocity
    c. Centro
    d. Velocity Polygon or Relative Velocity

2. Short review of Vectors

3. Scales
    a. Space Scale, Ks
    b. Velocity Scale, Kv
    c. Acceleration Scale, Ka


Click here to access the file:
Velocity Analysis


 Our professor also gave the presentation for the course, Kinematics. Download it now.
Kinematics Presentation

How to Draw an Ellipse by Four-Center Method

 There are various methods in drawing an ellipse. We have the simple Pins & Strings method, the Concentric-circle method, and the Four-center method. I will share to you the Four-center method by giving the steps and a diagram so it will be easier to understand.

Steps:

1. Draw the major axis, AB, and the minor axis, CD, which are mutually perpendicular at the midpoint, O, as shown in the diagram.

2. Draw AD, that connects the end points of the two axes.

3. Using a compass, point the tips of it to DO then plot it along AO and reset the compass on the remaining distance to O.

4. With the difference of semiaxes thus set on the dividers, mark off DE equal to AO minus DO.

5. Draw perpendicular bisector AE, and extend it to intersect the major axis at K and the minor axis at H.

6. With the compass, mark off OM equal to OK, and OL equal to OH. 

7. With H as a center and radius R1 equal to HD, draw the bottom arc.

8. With L as a center and the same radius as R1, draw the top arc.

9. With M as a center and the radius R2 equal to MB draw the end arc.

10. With K as a center and the same radius as R2, draw the other end arc.

The four circular arcs thus drawn meet, in common points of tangency, P, at the ends of their radii in their lines of centers.

If you have questions or request, feel free to leave a comment.

Lateral Development

 The development of lateral surfaces is simply the flat surface or 2D that you need to cut when you are about to make a 3D thing. If you want to make a cylinder, pyramid, or a cube for an instance a lateral development layout may firstly be required. 
                    (Click to enlarge)
Here is an example of a lateral development drawing of a rectangular right pyramid. The true lengths of the edges and base are measured in order to have an accurate piece. A top view and front view of the pyramid was drawn first to help in drafting the lateral development of it.


Actually lateral developments are very useful in my machine shop course. In my class, we are about to make a tool box as our first project for the semester and a layout of it should be draft first.

(Click to enlarge)

This is the draft of our group. The tool box layout is divided into five parts. The holder and the lowest piece under the lock will be attached to the cover and the upper pieces of the lock will be on the body. The connector will be used to attach the two main parts of the tool box, the cover and the body.

Hailstorm in Philippines

Hailstorm in Saudi Arabia

 Yes, a hailstorm in Marikina, Philippines. This is the first time I've seen small ice particles fall from the sky here. I happened to see such hailstorms, well I know it's quite peculiar, in Saudi Arabia, a country that mostly comprises deserts. That was twice on a consecutive year in the month of May.

It was 11:30am when it started raining hard. I actually even looked outside because the rainfall is much heavier than the usual. And I saw mothball like particles on the street. Sadly, I didn't have the chance to take some photos. I was stunned from what I see that instance.

A shelf cloud forms following a torrential rain and hail storm west of Budapest, Hungary, yesterday (European PA).

I couldn't believe that hailstorm will also happen here in the Philippines. Well I hope the next thing that will fall from the sky are snows. I really wanted to experience snowing.