Nat Sci 1 Prelim Exam Coverage

What will be included in Prelim Exam are the following

• Brief History of Physics

[The arrangement of the following is based on Conceptual physical science by Paul G. Hewitt, John Suchocki, Leslie A. Hewitt. -- 5th ed. Chapters 1, 2, 3 and 4.

For other earlier edition (like the one I'm using in class), the same topics runs from Chapters 1, 2, 3, 4, and 5]

•  Aristotle on Motion 
•  Galileo’s Concept of Inertia 
•  Mass—A Measure of Inertia 
•  Net Force 
•  The Equilibrium Rule 
•  Support Force 
•  Dynamic Equilibrium 
•  The Force of Friction 
•  Speed and Velocity 
•  Acceleration 

•  Newton’s First Law of Motion 
•  Newton’s Second Law of Motion 
• When Acceleration Is g—Free Fall 
•  Forces and Interactions 
•  Newton’s Third Law of Motion 

• Momentum and Impulse 
• Impulse Changes Momentum 
• Conservation of Momentum 
• Collisions 
• Energy and Work 
• Potential Energy 
• Kinetic Energy 
• Work–Energy Theorem 
• Conservation of Energy 
• Power 

• The Universal Law of Gravity 
• The Universal Gravitational Constant, G
• The Inverse-Square Law 
• Wei ght a nd Wei ght lessness 
• Universal Gravitation 
• Projectile Motion 
• Fast-Moving Projectiles—Satellites 
• Circular Satellite Orbits 
•  Elliptical Orbits 
•  Escape Speed 

It is my regret to inform you that the report of Group 1 (Sources of Energy) will not be included in Prelim Exam. If you have already studied it, please do not be disheartened for it will be incorporated in the Midterm Exam. My apology for this abrupt change.

Type of Exam: Multiple Choices
Although it is Multiple choices, conceptual and problem-solving questions are merged in it as well.
34 % of all the questions are objective
Ex: This quantity refers to the product of mass of an object and its velocity.
A. force
B. acceleration
C. impulse
D. momentum
33 % will be composed of conceptual questions.
Ex: Can an object possess work?
A. Yes
B. No

And the remaining 33 % will be problem solving questions
Ex: A 0.1-kg stone is dropped from the roof of a building. It strikes the ground after 6 s. How high is the building? Air friction can be neglected. (Note: For simple calculations, use g≅10 m/s2) 
A. 20 m
B. 400 m
C. 2 m
D. 10 m
E. none of the above.

Please study well and...
Good luck, guys!

Announcement for Nat Sci 1 Bb3

Those who were absent last meeting (Thur, Dec 12,'13), please submit a copy of your vacant times every Wednesday so that I can determine what time you should take the Prelim exam next Wednesday (Dec 18,'13).

Tentative date for Nat Sci Prelim Exam

Tentative date for Nat Sci Prelim Exam is December 18, 2013 (Wednesday). I hope everyone will prepare for that.

No class on saturday

Please be informed that we won't meet this coming sat. nov 30 because that's a holiday (Bonifacio Day).

Camptured moment with Nat Sci 1 - Hh1

Here's our photo, guys. :-)

If you want to download higher definition version of this photo, just click here.

Nat Sci 1 Top 3 Videos

Congratulations!!!

 to the students whose videos are among the top 3 from each class.

Top Videos from Nat  Sci 1 - Rr
Top 3 - Mangorac, Johara
Top 2 - Balindong, Amerah Jehan
Top 1 - Brown, Camille

Top Videos from Nat  Sci 1 - Hh1

Top 3 - Toldo, Mark Alvin
Top 2 - Gurrea, Maylen

Top 1 - Clar, Shiela

Phys 11 - Qq Comprehensive Exam Result

Top 6 scores

	Name	Score
1	LLANO, Glee	129
2	KHABAB, Hanifa Taher	115
3	SARANGANI, Hedaya Ammeroddin	108
4	TAMPOGAO, NORJANAH MANALOCON	105
5	BORIONGAN, Rufaidah-pharmanisa C.	102
5	LAMPON, Gwean Zennica Lanurias	102
6	HUSSAIN, Jehan Salman	98
6	MAMINTAL, Malica Casan	98

============= Other scores ============= 

Codename	Score
star	96
ATE	76
Conjg	68
December	92
Friction	80
Honey08	62
Jee	81
khj18	74
Lee	66
R0917	66
Shido	80
SJK	86
Sunam Kapoor	82
Tasnima	76
zakiyyoh21	94

Highest possible score: 146
Items: 130
Passing Score: 65

PS
answer to one of the bonus question can be found here.

Best Nat Sci 1 Video will be posted here!

Good Morning, everyone! and especially to my Nat Sci 1 students!
I have invited some high school teachers watch your videos. I asked them to choose the top 3 videos for them.
Soon, I will announce the top 3 from each class. And upload the top 1 videos here. :-)

I can't give INC

The Office of the Vice Chancellor for Academic Affairs (OVCAA) cast a prohibition on me. They do not allow me to give INC grade to any of my student. This prohibition has been active after I was involved in a forgery case caused by one of my students, she's an Agricultural Engineering student.

In truth, I was giving her a chance to pass Phys 21 subject. But she did not comply. Instead, she forged my signature and gave her own self a passing grade -- May The Almighty enlighten her. Eventually, this was discovered. She was given a disciplinary sanction and I was then forbidden to give INC grade.

Phys 31 - Bb Comprehensive Exam Result

Top 6 Scores
 Name ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
1    LEDESMA, Arnel Aranas    120      
2    LAGBUNAN, Rufe May Fuentes    108      
3    MALONG, Brenda Glez Naragas    104      
3    SALUPADO, Trexie Mellizze Bael    104      
3    VIOLANGO, LHEMAR JON MAGCANTA    104      
4    HENDI, Khayfa Usman    98      
5    LABANG, Cellmar Jun Barimbao    94      
5    MANALUNDONG, NESHREEN CALANDADA    94      
6    DELFINADO, Jeremy Caesar Tabungar    90   


~ ~ ~ ~ ~ ~ ~ ~Other scores with codenames ~ ~ ~ ~ ~ ~ ~ ~

Alexus    80      
Alucard    70      
CHARM    70      
Didz    60      
Eela    84      
Gin    74      
JAP    74      
Raxinly    58      
Sasuke    66      
Shehiro    78      
Switch    76      
tcgirl    82     

Item: 170
Passing score: 85

Note: Scores of Students without codenames are not posted here.

Nat Sci 1 - Hh1 Final Exam Result

top 5 Scores
 Name ~ ~ ~ ~ ~ ~ ~ ~ Score
1    SALAUM, Roselyn Macarayan    102      
2    ESPINOSA, JESSAN BUCHAN    94      
2    LEYSON, Aljen Lazarito    94      
3    MANUCANG, Sittie Aisha Teutoda    90      
4    DIANSAY, Dioneta Rose    86      
5    GURREA, Maylen Aurit    84   

  ~ ~ ~ ~ ~ ~ ~ ~ Other Scores ~ ~ ~ ~~ ~ ~ ~

Codename    score      
MDA27    82      
Zeroseven    48      
World Peace    60      
Shing    80      
saskie    50      
RGL    74      
RBIAR    72      
Nozomi    46      
NASH05    58      
Mar'z    72      
Kuya*    52      
jasay    42      
Dan    62      
Blueneish    76      
BARNIH    62      
Ashraf    52      
AN-08    76      
1221:)    60      
"september23"    58      
"B"    54      
"0811211"    68      
Sweet Potato    62     

Highest Possible Score: 120
Items: 100
Passing Score: 50

Nat Sci 1 - Rr Final Exam Result

Final Exam top 5

     name   ~ ~ ~ ~ ~ ~ ~ score      
1    GUMA-OS, Abdulmalik Mama Jr.    88      
2    DIBAGULUN, Johanisa Macote    84      
3    ONSIL, Hakim Marohom    82      
4    PANDAN, Reynadith Callao    80      
5    MATUAN, Naimah H.Nor    78      
5    PAGCALIWAGAN, Jean Postrero    78   

~ ~  ~ ~ ~ Other Scores ~ ~ ~ ~ ~ ~

codename    score      
AJMB    68      
Amatullah    70      
Athenah    58      
awesomevivi    76      
Chazzychacha    66      
dennyboy21    67      
E=mc2    76      
Flong    74      
Gen_Redz    68      
ice princess    70      
Jhal    72      
meowmeme1234    70      
princes Nichael    50      
princess    70      
qiszhmiln    54      
RM    62      
smile    76      
TOYI    72     

Highest Possible Score: 120

Items: 100

 

Phys 11 - Qq Final Exam Top 6

Congratulations to the following students!

Name ~~~~~~~~~~Score
LLANO, Glee  ~~~~ 115
SARANGANI, Hedaya ~~~~ A. 92
BORIONGAN, Rufaidah-pharmanisa ~~~~ C. 91
DAGOHOY, Girdin Grace D. ~~~~ 82
TAMPOGAO, Norjanah M. ~~~~ 73.5
HUSSAIN, Jehan S. ~~~~ 69.5

Passing rate of class: 37.5 % 
Highest possible score: 122

Items: 110
Passing Score: 55

Phys 11-Qq examples on Gas and Fluid Statics

I have uploaded some examples on Gas and Fluid Statics intended for Phys 11-Qq. To download, please click here.

Nat Sci 1 Topics Inculded in Final Exam

The following are the topics included in the Final Exam:
Electricity
Magnetism
Plasma
Brief History of Science
Fate of the Universe

80 % of the questions in the final exam will be about electricity and magnetism.
I have uploaded fact sheets on these except plasma. You can download it from the tab named “downloadables”.

Please study.
And Good luck. :-)

Phys 11 - Qq Assignment on Gases

Download your assignment from the following link:
https://docs.google.com/file/d/0B3byG7-_8w5YdVV5S1g4Y1otYjg/edit?usp=sharing

please also prepare for a short quiz next meeting.

Phys 11 - Qq Midterm Exam Top 6 Scores

Congratulations to the following students!

Name	Score
SARANGANI, Hedaya Ammeroddin (BS Biology)	107
BORIONGAN, Rufaidah-pharmanisa C. (BS Biology)	102
TAMPOGAO, Norjanah Manalocon (BS Biology)	99
LLANO, Glee (BS Mechanical Engineering)	95
LINOG, Rohaila Disimban (BSEd Mathematics)	91
KHABAB, Hanifa Taher (BSEd Mathematics)	90

  

Highest possible score: 125                    

Items: 110

Passing Score: 55

 Passing rate of class: 50 %

Some of my Lectures can now be Downloaded

As you can see I made another tab and named it downloadables. Some of my lectures can now be downloaded from there. :-)

I canceled some of my saturday classes

I decided not to meet Phy 11 - Qq and Nat Sci 1 - Rr yesterday, Sep 14, 2013.
There were two major reasons behind it. First, I was really not feeling well. I felt I could pass out if I didn't get some rest. Two, I was informed that electricity wouldn't come back until 5pm. And in those two subjects we needed electricity for powerpoint presentations.

To Phys 11-Qq, please study the topics about thermodynamics. Even though I haven't discussed it in class, it will be included in the exam this coming wednesday.

To Nat Sci 1 - Rr, I have left a handout on our first topic in Final coverage @ ALO branch 2 (the one near 5th crossing). Please photocopy it so that you can study. We'll have a quiz about it next meeting. :-)

Important Dates at the Edge of this Semester

Sept 25, 2013 (Wed) - Last Day of Classes
Sept 26, 2013 (Thu) - English and Philo Dept'l Exams
Sept 27, 2013 (Fri) - Math Dept'l Exam

Phys 31 First Chapter Exam Answer Key is Missing

Some of my students requested the answers to Phys 31 - Bb First Chapter Exam to be posted. So, two days ago, I put it on the bulletin board in front of Rm 233. But when I passed by this morning, it's not there anymore! . . Could it be possibly because someone was intensely attracted to my handwriting? (Hehe!)

Well I guess it'd be better if I hand over personally the answer key to my students next time.

Phys 31-Bb First Chapter Exam Top 6 scores

Congratulations to the following students who got the top 6 scores in Phys 31 First Chapter Exam
Score Name
95 VIOLANGO, Lhemar Jon M.
93 MALONG, Brenda Glez N.
82 LEDESMA, Arnel A.
79.5 LAGBUNAN, Rufe May F.
77.5 MANALUNDONG, Neshreen C.
76 RECOLETO, Loren Grace A.

Items: 135

Passing Score: 67.5

"To do" list on Sept 2, 2013

On September 2, 2013, which is supposedly the "rest day," I am going to meet my three classes.

In the morning starting 9AM, in my Nat Sci 1 - Rr (Regular Sched: WS 4-5:30pm) there will be reporting. Topics in those reports will be Sources of Energy and Global Warming.

By 1pm will give the second chapter exam to Phys 31 - Bb (Regular Sched: MH 7-8:30am). Ends @ 4pm Good luck guys!

And lastly @ 4pm, I am going to meet Nat Sci 1 - Hh1.

Sorry guys if this day won't be a "rest day" for us. But just look at the positive side of this. We can have our final exams ahead of the schedule alloted by the university and have our sem break earlier. hehe
See ya!

Phys 31 Students Did Not Show Up

I came to the college early this morning only to find out that about only 4 students appeared! I did not announce for any suspension of my class, but maybe most of them are just too excited to watch today's shows in the campus. (haha!) Well, I guess they enjoy this day as it's also part of their college life.

To Phys 31, please be reminded that our second chapter exam will be on September 2, '13 @ 1:00-4:00.

Classes on Sept 2, '13

Good Day!
The chairman of Physics Dept advised me not to give examinations during the University Intramural Games for the Office of the Vice Chancellor Academic Affairs forbids that. So, I have decided to move the Phys 31's second chapter exam to Sept. 2, 2013 (1pm-4pm).

And on that same day, I will also meet my Nat Sci 1-Hh class. Second group will report on Global Warming. Class will start @ 4pm.

Phys 11 Prelim

Phys 11-Qq's Prelim Exam will be on August 14, 2013. 2:30-4:00pm, Rm 234.

August 9 decleared a holiday

(UPDATE) The whole nation joins Muslims from all over the world in celebrating the end of the holy month of Ramadhan as Malacanang declared August 9, 2013 a regular holiday.

Proclamation No. 629 series of 2013, signed by President Benigno Aquino III Thursday, named Eid’l Fitr (Feast of Ramadhan) “a regular holiday throughout the country.”

“Eid’l Fitr is celebrated by the Muslim World for three days after the end of the month of fasting,” the document, posted on the Official Gazette, said.

August 9 has been declared a holiday in the predominantly Catholic Philippines to “promote cultural understanding and integration,” the Palace said.

Aside from Eid’l Fitr, there are two other holidays in August this year under Proclamation No. 459 released Sept. 1, 2012.

Ninoy Aquino Day, August 21 (Wednesday), is a special (non-working) holiday. August 26, the last Monday of August, is meanwhile National Heroes Day, a regular holiday.


Advance Happy Eidl Fitr, guys!

Source: yahoonews

MSU-Main's University Orientation Is On July 11, 2013

To all concerned, this is to inform you that the MSU-Main's University Orientation will be held on July 11, 2013 (Thursday Morning). I have just confirmed this information directly from our university secretary Dr. Mary Joyce Guinto-Sali. 

Now, it's already a custom of the CNSM that after the university orientation in the morning, the college orientation would follow immediately afternoon. 

So, my classes on Wednesday (July 3, '13) will not be postponed due to the said event.

:-)

June 24, '13 is Declared a Muslim Holiday

To all concerned, please be informed that the Office of the President, MSU has issued a memo declaring Monday, June 24, 2013 as a Special Non-Working Holiday in the Observance of Nisfu Sha'ban, based on the memorandum issued by the Office of the Mayor, Islamic City of Marawi.

Classes Are Not Postponed

Even with another blow of horror incident that had occurred yesterday (June 16, 2013) in our campus, the system did not release any memorandum of postponing classes. There will be classes.

We will meet tomorrow.

Answer to the Question About Payment to Phys 11.1 (lab) during summer

Anonymous posted as a comment:
Salam. Sir, bakit ganun? Nung nagbayad na ako, sabi nila may pending payment pa ako yung sa summer tuition na dinagdag sa lab (P155) and then nung pinuntahan ko sa edp and dinala ko yung receipt and sabi nila bayaran ko nalang daw kasi hindi pa raw nakakaremit yung physics dept dun sa binayad namin so ang nangyari, nakabayad ako ulit ng 155 sa UBO for that. I bet lahat kami ganun sir. 

Answer:
Yes, even some of your classmates have experienced the same thing.Please see ma'am Heidi and present your receipt (the one she gave you) so that you can refund the amount.

Answer To A Question On Phys 11 Grade

Anonymous posted as comment:
sir? anu pala yung comprehensive exam? walang paki don sa grade ko? pumasa man ako sir don sa comprehensive.. na bakit ganito lang yung grade ko? i need an explanation for this. sir, pinuntahan kita sa office mo na wala ka, panu kita makausap ng personal. sir, i have to fix this.. please..huhuhu

Ans:

First of all, I am so sorry for what had befallen you... as I do really feel sorry to all my students who flanked. But given this responsibility of teaching young students and the responsibility of being a judge over an academic subject, it is really necessary for me to be fair in giving grades. If you only knew how hard it feels, to give a high grade to the students you dislike, and give low grade to the student you like. . . It's really hard. Nevertheless, what you deserve should be given to you. 

As I had informed all of you in class that the grade would be based on the following Grading system:
60 % - Major Exams
25 % - Quizzes
10 % - Assignments
5 % - Attendance

The first thing to take note here is that the grade is not only based on Major exams. Although its gravity is big, other domains should not be neglected. Major exams do not guarantee that you would have high or passing grade. Let me give you an example.

_____________________________________________________

For example, you got passing scores in the four major exams. Let's say you got 50 % in each, that is, say you have a score of 60 out of 120 items. In the grading system, that 50 % passing score in  each major exam is worth 7.5 %. ($latex 15 \times 60 \div 120 = 7.5 $)
You didn't have quizzes and assignments. And you had lots of absences (so let's say you gained 3 % in attendance).

So the computation would look like this:
7.5 % - Prelim
7.5 % - Midterm
7.5 % -  Final
7.5 % -  Comprehensive
0 % - Assignment
0 % - Quizzes
3 % - Attendance
Add all this up. The result is 33 %, which is far below 50 %. And that's failed.

This is a simple example showing that even though the major exams were all passed, the grade may still be low (or a failure in this example) due to low scores in quizzes, assignments and attendance. 

Try to check again your scores. And follow simple computation I have just described.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PS
If you went to my office to see me, you couldn't see me really because I am not around the campus most of the time these days due to busy schedule that had befallen me. I may even be out of the country next week. So if you want to look at your scores in my record and see the actual computation of your grade, please do not hesitate to visit me any office days after June 9, 2013.

Thank you for posting your question.

Phys 11 - section A (summer 2013) Grade

Greetings of peace, Phys 11!
The following is the list of your grades*.

Codename/id no	Grade
1621	5
3395	1.75
200428315	5
201122057	5
(p6 11)	5
$latex 9.8 \textup{m/s}^{2} $	DRP
ALIB	2.75
Atom =)	2.5
Ayasumi Nasai	2.25
Badak	2.75
Caramia	3
CHACHA DABARKADS	2.75
Cherry blossoms	3
D' LOST	2.5
fire	5
Flame 02	2.5
Hayana	2
HAYATEE23	2.25
horsepower	2.75
jm"	1.25
Kagume	2.75
Kirarin	2.75
Quantum Physics	2.75
Shicamaro	3
SOMEONE <3 td="">	2.75
Sparkle	2.25
tetsuya	1.5
UltraePop	2.75
Zhorns	2

The computations was based on this Grading system:
60 % - Major Exams
25 % - Quizzes
10 % - Assignments
5 % - Attendance

*Note: The grades written here may not be the same with what will appear in grade card since some students submitted their assignments late. Those late assignments were not included in the computation here, but will be included soon. Thus the final grade in grade card may appear higher than what's written here.

Phys 11 (summer 2013) grade

Phys 11 - A students' grades will be posted within this week  next week.

And my physics summer classes are over

Before even the enrollment for summer classes, I wished and requested them to give me schedules not earlier than 11 AM. Early morning was supposed to be spent at the oval - pumping oxygen to the muscles and burning the unwanted fats. But what could we do when the demands of others seemed like they couldn't live if their wishes were not granted? At that, we have to give way, of course.

The days were numbered. On one hand, there is the upcoming May election. On the other, there is the deadliest-deadline stuck in my head to accomplish the papers required in leaving the country.  The allotted time was too short, and so the travel demands tremendous speed. Were the comfort to be the only one considered, I should have lessened the pace in class. So, the only remedy I could find was  present my lectures through the power points. The pace was good, I was able to accommodate each scheduled topic at each allotted day. But were the passengers able to grab onto their seats when they boarded a train at such a surprising speed? - sweat of worry spurt from my flesh at that thought for when I looked at the first few activities, it seemed absurd. . . Hence, I was forced to examine each passenger almost everyday. . . Somehow, I was glad the class was gradually gaining momentum later on. The later performances were impressive.

Anyway, I am glad that it's already over now. And so, I and you can finally relax again. I can go out early in the morning again, without my 2.0 kg backpack on my back. . . and burn my fats on racetrack, and savor the taste of my hot morning beverage. :-)

To all my students this summer, it was nice meeting you. It felt good upon observing that you  were paying attention to the lectures, especially when you laughed at my crazy ideas (ex. submerging your father into swimming pool, drinking the water from lake through hose, etc.) of applying the physics into real life. You should understand that those (naughty ideas) are not really meant to be done in real, but were only mentioned to break the ice and to avoid the blood flowing from your nose. (...for then we'll need a lot of tissue)

Good luck to all of you.

PS
To be successful in real life, always remember:
"Plan, Execute and Conquer."

Phys 11 Comprehensive Exam Result

TOP 5 Scores

	Name of Student	Score
1	RATABAN, Rohainah M.	106
2	CAPISTRANO, Jollymar M	104
3	MALATUS, Sohaya B.	100
4	DERICO, Hidaya U.	97
5	BALANGUE, Johaira B.	88
	COBRADOR, Julie Gonzales	88
	SUCOR, Sittie Saliha M.	88

=======================================================

Other Scores

Codename	Score
1621	64
3395	87
200428315	58
201122057	81
(p6 11)	86
Atom =)	82
Badak	85
Caramia	81
CHACHA DABARKADS	78
Cherry blossoms	84
D' LOST	83
fire	62
Flame 02	85
HAYATEE23	82
horsepower	86
Kagume	86
Kirarin	72
Quantum Physics	60
Shicamaro	73
SOMEONE <3 td="">	82
UltraePop	78

Highest Possible Score: 140
Items: 120
Passing Score: 60

Last Captured Moments Together

Hi, Nat Sci - Ll2 people!
Here's the slideshow of our pictures taken on the last day of our class. Sorry if there were things that I did which cause you headaches. You should understand that all of them had sincere ambition. And that is to help you shape yourselves into becoming a diamond, glittering, vulnerable and attractive.
Thank you for bearing with me throughout this semester.
Happy holidays!
And good luck as you enter new chapter in your journey in the academe.
:-)

captured last moments together - slideshows

Nat Sci 1 - Ll2 Final Exam Top 5

Congratulations!

... to the top 5 scorers of Nat Sci 1 Final Exam!

        Name                                            Score

CABARLES, Mary Joy Abogada	92
BALINDONG, Elham Sidic	75
BERAME, Sherilyn Yongco	74
MOSEP, Rushelle Vergara	73
TORRENUEVA, Ma. Glaide Pepito	70

See Me on Monday (Mar 11)

To all my students this semester who have unfinished business with me,
(these people are:
1. Phys 21.1 students who have not yet passed their previous activities
2. Phys 11.1 students who have missed two or three activities
3. Nat Sci 1 - Ll2 who have not passed their last assignment, and those who did not claim their balance during Final Exam)

please see me on Monday (March 11, '13). I will be in the office from 8:00 AM til noon.

*Note: Nat Sci 1 Final Exam topnochers shall be posted here next week. ^_^

Nat Sci 1 Last Assignment Samples

Good Morning, everyone!

Here's an example of the video you're going to make. To make it really authentic you should be seen in the video. ^_^

To make things easier for you, I have listed below some of the simplest demonstrations. You may choose one among these. Or if you know something else, better than any of these, perform that. It's really up to you.One group should perform only one .

Hope you'll have fun doing this!

A. Dancing Wire
1. Take two identical water glasses and use a measuring cup to fill each with the exact same amount of water.
2. Cut a piece of thin wire that's inch longer than the diameter of one of the glasses.
3. Place the wire across the top center of one glass.
4. Bend the wire so 1/4 inch hangs over each side to keep the wire in place.
5. Rub your finger along the outer rim of the second glass to make sound and watch the wire move. Since both glasses have equal amounts of water, they both have the same natural frequency. Sound is transferred from one glass to the next and thus the vibrations cause the wire to move

B. Seeing Sound
This is a simple experiment that requires very little setup and only three materials.
1. Tie a piece of thread to some tissue paper and hold the tissue paper by the thread in front of a speaker.
2. Turn on the music and observe what happens to the tissue paper.
3. Try different types of music at different volumes and see if there's any change to the paper.
4. The tissue should move when the music is played.

C. Model Eardrum
1. Stretch plastic wrap tightly over a wide mouthed container like a bowl or pot.
2. Place 20 to 30 grains of rice on top of the plastic.
3. Bang a metal cookie sheet or something equally as loud to make noise close to the plastic wrap.
4. Watch as the grains of rice move. The plastic wrap reacts to sound waves in a way similar to the human eardrum.
5. Have your friend make noises to see if they can make the rice move.

D. Sound Waves Blowing Out a Candle

Materials To make a candle snuffer, you need a 2-liter plastic soft drink bottle, plastic wrap, a rubber band that will fit tightly around the largest part of the bottle, scissors, a small candle in a holder and matches or a lighter.
1. Cut off the base of the bottle.
2. Poke the sharp end of a pair of scissors through the plastic to make an opening for your scissors. The edge of the plastic can be sharp, so use caution as you cut.
3. Stretch a piece of plastic wrap tightly over the cut end of the bottle, leaving a small overhang. Secure the plastic wrap around the bottle's circumference with a rubber band.
4. Stand the candle on a table or stable flat surface, and then light the candle.
5. Point the neck end of the bottle at the flame, about two-inches away from the flame.
6. Sharply tap the plastic wrap with your finger as if it is a drum. Listen for the sound you create and observe the candle's flame.

Reference:
www.ehow.com

Nat Sci 1 - Ll2 Last Group Assignment

The Last Group Assignment shall be posted tomorrow. ^_^

Nat Sci 1 - Ll2 Powerpoint file on sound wave

To download the powerpoint file that I was using on our last topic, please click either of these:
1. For 2010 format, click  here.
2. For 2003 format, click here
Note:
*If you are using Microsoft Office 2010, choose 2010 format, otherwise choose 2003.
*These are all compressed  (so that I could upload it easily). To view it, you should extract it first e. g. using WinRAR.
*The video clips may not work because they were hyperlinked to the original file in my computer. Nevertheless, the video clips I've shown you in the last 4 slides are extracted from a youtube video uploaded by Pauli1982, shown below.

Nat Sci - Ll2 Last Assignment

Answer the following.
I. Show your solutions.
1. What is the frequency, in hertz, that corresponds to each of the following periods? (a) 0.10 s (b) 5 s.
2. What is the period, in seconds, that corresponds to each of the following frequencies? (a) 10Hz, (b) 0.2 Hz.
3. (a) What is the wavelength of a 340-Hz tone in air? (b) What is the wavelength of a 34,000-Hz ultrasonic wave in air?
4. While playing a game in a golf course, a friend of yours is 408 m away from you. You shout at her saying her name “Jayne!” How long will it take before she hears her name?
II. In your own words, concisely discuss the following.
1. If the Moon blew up, why would we not hear it? (Hint: Sound wave needs medium so that it can travel.)
2. What happens to the wavelength of sound as the frequency increases?

My first try in writing mathematical formula in this blog

Fascinated by a way to write formula in blogspot.com, here's my very first.
The codes used are based on the LATEX and simulated via java extension file installed in this blog. ^_^
 $latex \displaystyle S(n)=\sum_{k=1}^{n}{\frac{1}{T_{k}}=\sum_{k=1}^{n}{\frac{6}{k(k+1)(k+2)}$

Nat Sci 1 - Ll2 Assignment on waves

Hi!

When I printed out the Assignment on Light waves this morning, I didn't examine if it were clear enough. And I have already distributed all the copies to all of you before I could realize that it was NOT really good (blurred, in other words). Sorry for that, guys.

Hence, I am uploading the screen shot of the original copy.

Note:
*Hint for question 3: consider the speed of laser light to be a constant (300,000,000 m/s) and that the distance between the moon and the Earth is 384,403,000 m.

*In question no. 4, c stands for the speed of light, f for frequency, and the symbol next to letter "f" in the equation is the greek letter lambda, notation for wavelength.

*In question no. 5, nm is a shorthand notation for nanometer.