Happy Holidays!

I would like to extend to all my students this sem a warm greeting of "Happy Holidays!"

:- ) I hope you enjoy your vacations. See you next year, guys!

Islamic new year will be on nov 25

Islamic new year (based on Hijra calendar) will fall on November 25, 2011 (this friday).
But unlike the new year observed in Gregorian calendar, Islamic new year is not observed by muslims with grand celebration (with special foods and everything). There are some reasons behind it.
Check this out.

To my new students

The new semester has just started. And I bet everyone had a very joyful moment during enrollment, (~swimming with the rest of the crowds especially in the payment part at the cashier). . . With the 50th anniversary already celebrated, MSU is still MSU. Usual adventure during enrollment period is still on going. haha... Everyone would have to grit their teeth during that period.
And yes, that's just the beginning. . . You should expect more of those kinds. . .
Just this afternoon, I met my afternoon class for the first time. It was cloudy outside and getting darker. And it was great. . . because the electricity went out! So, I just encouraged them to bring candles the next time we meet... so that the afternoon would be romantic. What do ya think, guys?
Well, in behalf of these joys offered by MSU, I'd like to greet all of my new students the best greeting that I can offer:
S A L A M! (or peace in English)

And may you have the patience to bear with me. :-)

Happy Eidl adha to our muslim brothers and sisters!

Construction of bipolar tesla coil

The following is our paper published this October 2011.

Abstract

This paper reports on construction of a bipolar tesla coil and an investigation of the series inductor-capacitor (LC) driver circuit configuration by varying some parameters. Its primary circuit consists mainly of a tank circuit powered by a neon sign transformer (NST). The static spark gap serves as a switch and protector of NST and the high voltage (HV) capacitors. The capacitors are made up of car battery casings, the dielectrics are glasses to avoid breaching, and the electrodes are brass and copper plates. The primary coil is a copper tubing and wound into a helical form. The secondary coil is made of a long magnetic wire wound on an insulated pipe. The bipolar tesla coil was operated with varying values of the HV capacitance and number of turns of the primary coil so as to find the maximum voltage that it can produce.

1. Introduction

Tesla coil is a special type of transformer. It is an air-cored transformer working on its own resonant frequency used to generate very high voltage. Primary coil consists of few turns of thick wire (usually copper tubing wire), secondary coil is wounded by hundreds or thousands of thin wire on cylindrical skeleton.

There are many kinds of configuration for Tesla coils but here in this study, bipolar type of tesla coil is used. The secondary coil is mounted horizontally and the primary is centered at the secondary.

2. Methodology

In building the bipolar tesla coil, Series LC driver configuration was used.

2.1 Spark gap

The spark gap serves as a high power switch that is responsible for the discharge of the HV capacitor into the primary coil of the Tesla Coil. It turns on when sufficient voltage exists in it. The spark gap turns-off when the current flowing through it drops to a low level and the air regains its insulating properties.

2.2 High voltage capacitor

The high voltage (HV) capacitor stores charge and is mostly charged in a few milliseconds, and then fully discharged into a few feet of primary coil in a few microseconds. This gives rise to incredibly high peak currents, rapid voltage reversals and high dielectric stress but usually have very small capacitance for it to the discharge quickly. The HV capacitor uses glasses as dielectrics and Brass and Copper sheets as its parallel plates.

2.3 Primary coil

The primary coil is designed for very high currents. Therefore, the wire must be very thick. As the currents are of high frequency it is not needed to have massive wire because of the skin effect. Therefore, the copper tubing was a good choice.

2.4 secondary coil

The secondary coil is simply a long winding wire 1107 turns. When stimulated by the primary coil, it produces such oscillations. In doing this, the secondary coil will produce amazingly powerful oscillation and voltages anywhere from hundreds of thousands to the millions.

3. Result and Conclusion

The maximum experimental value of the capacitance was 13.89 nanofarad when the two HV capacitors were in parallel connection. The maximum output voltage produced is 203.2 kV.

Although the design of the primary coil is to produce high spark gap lengths on the ends of the secondary coil, most likely it is also directly proportional to the number of turns of primary coil. This is because the oscillating magnetic field of larger number of turns produced high voltage nodes than those produced by oscillating magnetic field of fewer numbers of turns.

The following video clips show the sparks of our bipolar tesla coil. I constructed it five years ago with Mr. Arlie Apduhan . . . The result of our tiresome efforts. :-)

Bibliography

1. Alcantara, P, and Hamoy, E., (2006) Design and Implementation of a High Voltage High Frequency Tesla Coil, undergraduate thesis.

2. Corum, J. F., et al., (2006) Six International Symposium Nikola

Tesla: Multiple Resonance in RF Coils and the FailureTesla Coils a

nd the Failure of Lumped-element Circuit Theory.

3. Corum, J and Corum K. (1994) Nikola Tesla, lightning observations,

and stationary waves, New York.

Acknowledgment

The authors would like to thank Mr. Alcantara, and Mr. Hamoy for the assistance and fruitful advices in making this project. And the Physics Department of MSU-Main for the support and encouragement to publish this work.

Happy Sembreak to all my students

The first semester is finally over. And everyone's packing their bags for an enjoyable vacation. . .(or are they in boracay already? hehe)
Happy sembreak to everyone.

Phys 21.1 - FG Final Exam Result

Congratulations to the following students from Phys 21.1 - GH who got the top 5 scores.
(Class Schedule: Every Mon 2:30pm-5:30am. Rm 233)
TOP 5 Scores
Score - Name
60 - CLIMACO, Neil Cabantac
56 - CANDIDATO, Abdullah Guro
50 - BANIAGA, Mohammad Akeem Aminodin
46 - ALICASIM, Farhanah Taher
42 - PACON, Icee Bagcatin


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Codename - Score

dodong Joy - 37

jam - 39

kerzhekiah - 30

Lavania - 39

MCKOY - 39

mrbon - 37

nervon929 - 41

pooh - 15

Raighne - 26

RAT - 19

rjen - 34

Highest Possible Score: 61
No. of Items: 55
Passing Score: 28

Note: The only scores posted here are:
(1) top 5 scores (with the original name of the student for they are worthy to be recognized)
(2) the scores of students with codenames.

Phys 11.1 - CD Final Exam Result

Congratulations to the following students from Phys 11.1 - CD who got the top 5 scores.
(Class Schedule: Every Mon 8:30am-11:30am. Rm 233)
TOP 5 Scores
Score - Name
48 - DIMA, Norhata Magomnang
46 - ABDULCADER, Mohammad Bakry Mohammad
46 - CORTES, Angelbert Damian
46 - HADJI ISMAEL, Nor-ain Umpa
46 - INAO, Sheriel Riah Dumaog
44 - LUMBATAN, Jasper Quimbo
43 - MAMACOL, Hamima Dimapinggun
41 - H. ALI, Namerah Marabur

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Codename - Score

Anwimi - 22

Asie - 14

CD14 - 33

Hyungnim - 35

J,A,S - 22

JC7 - 28

P.N. MAQU - 23

Highest Possible Score: 56
No. of Items: 52
Passing Score: 26

Note: The only scores posted here are:
(1) top 5 scores (with the original name of the student for they are worthy to be recognized)
(2) the scores of students with codenames.

Phys 11.1 - EF Final Exam Result

Congratulations to the following students from Phys 11.1 - EF who got the top 5 scores.
(Class Schedule: Every Mon 11:30am-2:30pm. Rm 231)
TOP 5 Scores
Score - Name
52 - MANLANGIT, Emelyn Marapao
47 - BATOY, Karen Jean Masas
47 - DESACA, Grace Ann Raney
43 - COSAIN, Johairea Ladao
40 - DADULO, Charissa Agan
40 - DUHAYLUNGSOD , Adonis Navarro
40 - FLORES, Nelson Tolentino
38 - ARAÑAS, Marvie Angelo Magsanay
38 - GUBAT, Dayyana Fairoz Macarambon

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Codename - Score

Becheb_24 - 29

Delilah - 20

Dux - 21

Faith - 25

Genji - 28

jas389 - 22

littleprincess - 27

mezume - 27

Highest Possible Score: 56
No. of Items: 52
Passing Score: 26

Note: The only scores posted here are:
(1) top 5 scores (with the original name of the student for they are worthy to be recognized)
(2) the scores of students with codenames.

Phys 11.1 - qr Final Exam Result

Congratulations to the following students from Phys 11.1 - qr who got the top 5 scores.
(Class Schedule: Every Sat 2:30pm-5:30pm. Rm 230)

TOP 5 Scores
Score - Name
54 - BONOSTRO, Marvin Allona
52 - MAUTE, Hafida Romato
46 - GUILLERMO, Rosen Mae Carbonilla
44 - OUANO, Johann Hosea Calo
43 - OMAR, Hanifah Alawi
43 - SUMNDAD, Zakirah Mangotara

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Codename - Score

hehe - 41

*Tira mii xoo - 28

Anime_crazy01 - 35

cat - 18

Hayate =) - 29

LadyheartlesZ - 19

Ladypink - 30

Ms Eight - 21

Nonpolar - 35

Highest Possible Score: 56
No. of Items: 52
Passing Score: 26

Note: The only scores posted here are:
(1) top 5 scores (with the original name of the student for they are worthy to be recognized)
(2) the scores of students with codenames.

No INC

To all of my students this semester,

I just want to remind you that I don't give INC. You can possibly receive any grade from me, except INC. So, please be sure to complete any deficiency in our subject before Oct 8, 2011 (Sat).

:-)

Phys 11.1 - op Final Exam Result

Congratulations to the following students from Phys 11.1 - op who got the top 5 scores.
(Class Schedule: Every Sat 11:30am-2:30pm. Rm 233)

TOP 5 Scores
Score - Name
46 - LIBANDO, Karren Grace Betser
46 - MAUTE, Asnimah Palawan
44 - CABANATAN, Irizclyne Orias
44 - GUERRA, Regin Rex Abunda
43 - BAYABAO, Fathma-Amera Arimao
41 - COSAIN, Mojaheden S
41 - KHALID, Safrollah Abdulhamid
39 - BEDOYA, Joel Jabez Virtudez
39 - GALGO, Sussie C

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Codename - Score

Bishop - 38

Dew - 17

JAYPEE - 29

JECOY - 21

just - 32

Meckiey_29 - 27

Quiney - 19

Striker_jun - 30

Highest Possible Score: 56
No. of Items: 52
Passing Score: 26

Note: The only scores posted here are:
(1) top 5 scores (with the original name of the student for they are worthy to be recognized)
(2) the scores of students with codenames.

Phys 11.1 - mn Final Exam Result

Congratulations to the following students from Phys 11.1 - mn who got the top 5 scores.
(Class Schedule: Sat 8:30am-11:30am. Rm 233)

TOP 5 Scores
Score - Name
50 - PAGUYOD, Mayrose Tabilla
49 - HAICTIN, Ma. Vanessa Icao
48 - YEMA, Mikee Marie Elumba
45 - MACKNO, Ammarah Sarip
44 - ANTONIO, Jairah Rossan C asio
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Codename - Score

201025474 - 39

Am'z -17

Eerep - 42

kairomone - 27

m7 - 35

Mr. J - 19

Naruto - 28

Snoopy - 43

TRUELOVEWAITS - 43

tsubaki - 38

Vashstampped - 13

wonderland - 41

Esther - 35

Highest Possible Score: 56
No. of Items: 52
Passing Score: 26

Note: The only scores posted here are:
(1) top 5 scores (with the original name of the student for they are worthy to be recognized)
(2) the scores of students with codenames.

To these phys 11.1-qr students

Good morning!
To the following students of Phys 11.1 - qr (Sat 2:30-5:30)
Aleta, Moryelle
Guillermo, Rosen Mae
Joromat, Jefferson

There are some things that we need to talk about asap.
If you have free time on sat, please see me on sat. I'll b n the office from 9:30am to 12noon.
Or you can contact me through this email add: yusof_denj@yahoo.com
or post a comment on this post.
otherwise, you may not be given grades!

End of First Sem is fast approaching!

Hi, guys!!!
As I count it, the number of days before the end of this first semester is less than 30 days...
To all my students this sem, Please take note of the following important dates:
Last Day of Classes - Sept 28, 2011
Start of Final Exams - Sept 29, 2011

And that leaves us with two meetings.
We'll use one meeting to perform lab activit(y/ies) and the other one for our final exam to avoid some conflict on schedules with other final exam schedules.

If you have some questions, you can
make a comment on this post (below you can see Posted by YD at 12:55:00 PM 0 comments, just click "0 comment" to post a comment), or send me an e-mail at yusof_denj@yahoo.com

Good luck to all of us!
Advance happy sembreak!
:-)

Assignment of Phys 11.1 - FG

Good Day! Phys 11.1 - FG students!
I would like to tell you that we'll not meet on Aug 1, 2011 (Monday). I gave you an assignment yesterday (July 25,2011), but some of you went home already when I gave it. So, I posted it here also. Please write your solutions on short bond papers. Due date is on Aug 8, 2011. We'll resume our Lab activities on that day also.

Assignment
Individually, solve the following problems. Refer to the given values of forces below. Each group is given set of values for Forces F1, F2, and F3.
In graphical method, you can make your own scale.
1. Find: (a) R = F1 + F2 using graphical method.
(b) R = F1 + F2 using Cosine and Sine Laws
(c) G such that F1 + F2 + G = 0
2. Find: (a) R = F1 + F2 + F3 using graphical method.
(b) R = F1 + F2 + F3 using Component Method
(c) H such that F1 + F2 + F3 + H = 0
=====================================================
Given for Group 1:
F1 = 19,600 dyn, 30 deg N of E
F2 = 9,800 dyn, 50 deg W of N
F3 = 147,000 dyn, 15 deg E of S

Given for Group 2:
F1 = 9,800 dyn, 60 deg N of E
F2 = 147,000 dyn, 30 deg N of W
F3 = 49,000 dyn, 15 deg S of E

Given for Group 3:
F1 = 4900 dyn, 15 deg S of E
F2 = 9,800 dyn, 45 deg S of W
F3 = 11,760 dyn, 15 deg W of N

Given for Group 4:
F1 = 4,900 dyn, 15 deg W of N
F2 = 9,800 dyn, 70 deg S of W
F3 = 147,000 dyn, 30 deg N of E


Given for Group 5:
F1 = 147,000 dyn, 15 deg S of W
F2 = 98,000 dyn, 10 deg S of E
F3 = 49,000 dyn, 45 deg N of W
 
=========================================
Note: Blogger.com does not provide an option to write subscript or superscript.
That's why, Force F with subscript 1 is just written as "F1". And the unit of angle degree is simply written as "deg".

July 4, 2011 is a non working holiday

We would like to inform everyone that tomorrow, Monday, July 4, 2011, is the 52nd Founding Anniversary of Lanao Del Sur and is therefore declared a non-working holiday.
=)

Grades Grades Grades

The Following is the list of grades of all my students in summer 2011. There are three subjects/sections included here. Phys 2 DE, Phys 2 FG and Phys 11 WX. It is in random order.

Codename ~~~~~~ Final Grade
3681 ~~~~~~~~~~~~~~ 2.75
JCF7 ~~~~~~~~~~~~~~ 3
200956455~~~~~~~~~~~~~~ 5

200637612 ~~~~~~~~~~~~~~ 5
RN ~~~~~~~~~~~~~~ 3
Night Phantom ~~~~~~~~~~~~~~ 2.75

Santie ~~~~~~~~~~~~~~ 2.5
Sam ~~~~~~~~~~~~~~ 3
Jeck_BI ~~~~~~~~~~~~~~ 3

ALPHA~~~~~~~~~~~~~~ 2.75
W1Z ~~~~~~~~~~~~~~ 1.75
200952766 ~~~~~~~~~~~~~~ 2.75

MOCS ~~~~~~~~~~~~~~ 3
Nicolas Patatas ~~~~~~~~~~~~~~ 1.75
Prince of Vampire ~~~~~~~~~~~~~~ 2.5

UNO~~~~~~~~~~~~~~ 3
M-4 ~~~~~~~~~~~~~~ 5
~~~~~~~~~~~~~~ 5

Sciann X~~~~~~~~~~~~~~ 2.75
Xane ~~~~~~~~~~~~~~ 2.75
Fay23 ~~~~~~~~~~~~~~ 2.5

Niño~~~~~~~~~~~~~~ 3
16 ~~~~~~~~~~~~~~ 5
TLS ~~~~~~~~~~~~~~ 2.5

Schizolobium ~~~~~~~~~~~~~~ 2.5
Elaia_14 ~~~~~~~~~~~~~~ 1.5
Kirens21 ~~~~~~~~~~~~~~ 3

Jjampong~~~~~~~~~~~~~~ 2
Mighty ~~~~~~~~~~~~~~ 2.75
HM ~~~~~~~~~~~~~~ 2.5

CHS2 ~~~~~~~~~~~~~~ 1.75
Praise ~~~~~~~~~~~~~~ 1.75
MGBA~~~~~~~~~~~~~~ 2

Schultz_101~~~~~~~~~~~~~~ 1.75
Lupin III ~~~~~~~~~~~~~~ 2
Shionette193 ~~~~~~~~~~~~~~ 1.75

"we" ~~~~~~~~~~~~~~ 2
Nuwra ~~~~~~~~~~~~~~ 2
KMJ ~~~~~~~~~~~~~~ 2.5

Tweety_07 ~~~~~~~~~~~~~~ 1.5
Annyka14 ~~~~~~~~~~~~~~ 2.75
Batrick ~~~~~~~~~~~~~~ 1.75

KINEMATICS ~~~~~~~~~~~~~~ 1.5
CHS ~~~~~~~~~~~~~~ 2.5
Delia ~~~~~~~~~~~~~~ 2.5

HAYLEY:) ~~~~~~~~~~~~~~ 1.75
~~~~~~~~~~~~~~ 5
Lucky ~~~~~~~~~~~~~~ 2.25

GRAY ~~~~~~~~~~~~~~ 1.75
"T" ~~~~~~~~~~~~~~ 2.25
NONE_14 ~~~~~~~~~~~~~~ 2.5

ROCKBARBIE=)~~~~~~~~~~~~~~ 2.25
S.A.M. ~~~~~~~~~~~~~~ 1.75
Aplah ~~~~~~~~~~~~~~ 2.25

SAM ~~~~~~~~~~~~~~ 2.75
UUKEEKA ~~~~~~~~~~~~~~ 2.25
HIME21 ~~~~~~~~~~~~~~ 1.25

BISMILLAH ~~~~~~~~~~~~~~ 2.25
ZELLE ~~~~~~~~~~~~~~ 2
Johnny Depp ~~~~~~~~~~~~~~ 2.5

:) ~~~~~~~~~~~~~~ 2
MRS. CHO~~~~~~~~~~~~~~ 1.75
200953082~~~~~~~~~~~~~~ 1.75

Umps ~~~~~~~~~~~~~~ 1.75
DATA ~~~~~~~~~~~~~~ 2.25


The grades that I've given are, of course, based on your performance. I'd like to remind you that you're the one who's making your grade. My work was simply to transmit the knowledge and give a fair judgement. And every decent student should understand that.

Grades

As requested by some, grades will be posted here soon...

Lost and Found Calculators

Lost and Found Calculators. They're scientific calculators. Owners were probably students in Phys 2 DE or FG (summer 2011).
To claim, visit our office rm 228, Physics Dept.

Phys 11 - WX Over All Top 5 Students

Congratulations to the following Phys 11 top 5 Students! :_)
Job well. Keep it up, guys!



JAAFAR, Norhaida Amil
Top 1


LUMBATAN, Jasper Quimbo
Top 2


GUERRA, Regin Rex Abunda
Top 3


POTAO, Fayza Ebra
Top 4


VILLANUEVA, Anthony, III Gestopa
Top 5

Top 5 students will be posted

Overall top 5 students in phys 2 - FG and phys 11 - WX will be posted soon.

Phys 2 - DE Overall top 5 students

Based on the performance from first day of summer class up to the final examination, the following excelled among the rest. :)



Top 1: MIRANDA, Vicky Irish Joy Ravelo



Top 2: SAMSODIN, Zawahirah Kusain



Top 3: ABDUL, Sitty Arifah Cota



Top 4: DIGAN, Kimberly Otero



Top 5:DIBAGULUN, Jhanisa Macote

Congratulations! (--,)

Phys 2 - DE FInal Exam

Top 5 scores
Score ~~~~ Name
85.5 ~~~~~~ DIGAN, Kimberly Otero
75 ~~~~~~ DIBAGULUN, Jhanisa Macote
74 ~~~~~~ ABDUL, Sitty Arifah Cota
73 ~~~~~~ GRADO, Jezamen Grace Casano
71 ~~~~~~ SAMSODIN, Zawahirah Kusain

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

Codename ~~~ Score
CHS ~~~~~~~ 57
Batrick ~~~~~~~ 58
Annyka14 ~~~~~~~ 30

Tweety_07 ~~~~~~~ 66
200847422 ~~~~~~~ 41
Nuwra ~~~~~~~ 62.5

"we" ~~~~~~~ 51.5
Shionette193 ~~~~~~~ 52
Schultz_101 ~~~~~~~ 67

MGBA ~~~~~~~ 58
HM ~~~~~~~ 50.5
Mighty ~~~~~~~ 40.5

Jjampong ~~~~~~~ 59

Items: 78
Passing Score: 39

Phy 11 - WX Fourth Major Exam (Comprehensive)

TOP 5 Scores
Score ~~~~~ Name

134 ~~~~~~~~~ JAAFAR, Norhaida Amil
126 ~~~~~~~~~ GUERRA, Regin Rex Abunda
126 ~~~~~~~~~ LUMBATAN, Jasper Quimbo
124 ~~~~~~~~~ JAWADIL, Christalyn Altamero
120 ~~~~~~~~~ TAHA, Samsodin Barauntong
118 ~~~~~~~~~ VILLANUEVA, Anthony, III Gestopa

==============================================
Codename ~~~ Score
16 ~~~~~~~~~ 74
Niño ~~~~~~~~~ 84
Fay23 ~~~~~~~~~ 92

Xane ~~~~~~~~~ 82
Sciann X ~~~~~~~~~ 100
~~~~~~~~~ 94

M-4 ~~~~~~~~~ 70
UNO ~~~~~~~~~ 80
Prince of Vampire ~~~~~~~~~ 86

MOCS ~~~~~~~~~ 104
Jeck_BI ~~~~~~~~~ 98
ALPHA ~~~~~~~~~ 98

Sam ~~~~~~~~~ 102
Night Phantom ~~~~~~~~~ 98
RN ~~~~~~~~~ 94

200637612 ~~~~~~~~~ 84
200956455 ~~~~~~~~~ 92
JCF7 ~~~~~~~~~ 98

3681 ~~~~~~~~~ 106

Highest Possible Score: 160
Items: 160
Passing Score: 80

Phys 11 - WX Third Major Exam (Final)

Top 5 Scores
Score ~~~~~ Name
72 ~~~~~~~~~ LUMBATAN, Jasper Quimbo
54 ~~~~~~~~~ JAAFAR, Norhaida Amil
53.5 ~~~~~~~~~ POTAO, Fayza Ebra
53 ~~~~~~~~~ MACKNO, Ammarah Sarip
52.5 ~~~~~~~~~ TAHA, Samsodin Barauntong

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

Codename ~~~~ Score
Schizolobium ~~~ 43
16 ~~~ 45
Niño ~~~ 35

Xane ~~~ 44
Sciann X ~~~ 39
~~~ 42.5

M-4 ~~~ 39.5
UNO ~~~ 41
MOCS ~~~ 45

200952766 ~~~ 46
Jeck_BI ~~~ 30.5
ALPHA ~~~ 39

Sam ~~~ 39.5
Santie ~~~ 47
Night Phantom ~~~ 39.5

RN ~~~ 47.5
200637612 ~~~ 28
200956455 ~~~ 43.5

JCF7 ~~~ 49
3681 47


Higest Possible Score: 90
Items: 80
Passing Score: 40

Phys 2 - FG Final Exam Scores

TOP 5 Scores
Score ~~~ Name
74 ``````` RASUMAN, Nahida Agor
71.5 ````` MICKDAL, Shirib Aidalus
69 ``````` UNGAD, Shejam Ubpon
65 ``````` SUMANDAR, Abubacar-Sidique Lawi
64 ``````` TANGKUSAN, Farr Krizha Inaril

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

Codename ~~~~~~ Score
Umps ~~~~~~ 49
200953082 ~~~~~~ 60
Johnny Depp ~~~~~~ 47

ZELLE ~~~~~~ 58
BISMILLAH ~~~~~~ 44
UUKEEKA ~~~~~~ 45

SAM ~~~~~~ 45.5
Aplah ~~~~~~ 51
NONE_14 ~~~~~~ 60

ROCKBARBIE=) ~~~~~~ 52
"T" ~~~~~~ 43
GRAY ~~~~~~ 51

Lucky ~~~~~~ 41.5
HAYLEY:) ~~~~~~ 55
Delia ~~~~~~ 32


Items: 78
Passing Score: 39

Answer Key to Phys 11 Self test (prelim cov)

Answer Key
I. Multiple choices (2 pts each)
1. A
2. D
3. B
4. B
5. B

6. A
7. A
8. D
9. E
10. B

11. C
12. C
13. B
14. B
15. D

16. D
17. E
18. C
19. A
20. A

21. C
22. D
23. C
24. B
25. B


II. PROBLEMS’ FINAL ANSWERS (10 pts each)
1. (b) Rx = -1618.05 km
Ry = 801.72 km
R=1805.78 km
Direction: 26.36 degrees North of West
2. (a) 21.28 m
(b) 20.64 m/s

3. (c) 0.49 m/s^2
4. vx = -19.67 km/h
vy = 6.89 km/h
v = 20.84 km/h
direction: 19.30 degress North of West

5. (a) v = 2.99 x 10^4 m/s
(b) Equate the centripetal force to the gravitational force exerted by the Sun on the Earth. Your equation should look like this
mv^2/R=GmM/R^2
Where M is the Sun’s mass, m is the mass of the earth, and R is the radius of Earth’s orbit.
M = 2.01 x 10^30 kg

Phys 11 Self Test (Prelim Coverage)

SaLam and Good Evening!
The following is a self test to help you test your understanding of our topics. Please take note that blogger.com does not provide any option to write subscript or exponent. So writing subscripts and exponents here, I made the following notations:
^ means raised to the power of (exponent)
* means subscript.
Example:
v^2 means variable v is squared
vx or v*x means the variable v has subscript x

Test yourselves to know how much you do really know. You should be able to finish this test within 2 hours. I suggest you to follow this time limit. I have also uploaded the answer key to this self test on another post. If you find some errors, please let me know asap. Good luck.


I. MULTIPLE CHOICES. Direction: Choose the best choice. Just write the letter corresponding to your choice. In some questions there can be more than one answer. But choose only the best one.

1. Which of the following quantities is NOT a vector?
A. Mass
B. Displacement
C. Weight
D. Acceleration
E. Force
2. A newton is the force:
A. of gravity on a 1 kg body
B. of gravity on a 1 g body
C. that gives a 1 g body an acceleration of 1 cm/s^2
D. that gives a 1 kg body an acceleration of 1m/s^2
E. that gives a 1 kg body an acceleration of 9.8m/s^2
3. The term “mass” refers to the same physical concept as:
A. weight
B. inertia
C. force
D. acceleration
E. volume
4. Mass differs from weight in that:
A. all objects have weight but some lack mass
B. weight is a force and mass is not
C. the mass of an object is always more than its weight
D. mass can be expressed only in the metric system
E. there is no difference
5. A block moves with constant velocity on a horizontal surface. A horizontal force of magnitude 5 N to the right is exerted on the block. Another horizontal force of magnitude 3 N to the left is exerted on the same block. The frictional force is:
A. 0
B. 2N, leftward
C. 2N, rightward
D. slightly more than 2N, leftward
E. slightly less than 2N, leftward
6. A 6-kg object is moving south. A net force of 12N north on it results in the object having an
acceleration of:
A. 2m/s^2, north
B. 2m/s^2, south
C. 6m/s^2, north
D. 18m/s^2, north
E. 18m/s^2, south
7. A 400-N steel ball is suspended by a light rope from the ceiling. The tension in the rope is:
A. 400N
B. 800N
C. zero
D. 200N
E. 560N
8. In the formula F = *Gm*1m*2)/r^2, the quantity G:
A. depends on the local value of g
B. is used only when Earth is one of the two masses
C. is greatest at the surface of Earth
D. is a universal constant of nature
E. is related to the Sun in the same way that g is related to Earth
9.The magnitude of the acceleration of a planet in orbit around the Sun is proportional to:
A. the mass of the planet
B. the mass of the Sun
C. the distance between the planet and the Sun
D. the reciprocal of the distance between the planet and the Sun
E. the product of the mass of the planet and the mass of the Sun
10. A horse exerts a force F on a cart, causing the cart to move with increasing speed. What force does the cart exert on the horse?
a) zero
b) equal to the magnitude of F
c) greater than F
d) less than F
e) cannot be determined unless the acceleration is given
11. When an object is in uniform circular motion,
A. the velocity of the object is constant
B. the acceleration of the object is constant
C. the rate of revolution is constant
D. the force acting on the object is constant
For items 12 – 13, consider the following situation: “A car of mass 1200 kg, moving with a speed of 60 km/hr round a highway curve of radius 200-m. The road bed is level and flat.”
12. The central force needed for the car to successfully round the curve is roughly
A. 11,760 N B. 9,667 N C. 1,667 N D. 969.7 N
13. The coefficient of static friction between the road and tires of the car is roughly
A. 0.082 B. 0.142 C. 0.822 D. 0.100

14. Cart A has a mass of 2 kg and a speed of 3 m/s. Cart B has a mass of 3 kg and a speed of 2 m/s. Compared to the magnitude of momentum of cart A, cart B has __.
A. smaller magnitude of momentum
B. the same magnitude of momentum
C. greater magnitude of momentum
D. not enough information to tell

15. A 0.2-kg ball slides across a frictionless floor with a speed of 10 m/s. If the ball strikes a wall and bounces off with a speed of 10 m/s into opposite direction. The magnitude of the impulse on the puck is ___.
A. 0 kg m/s
B. 1 kg m/s
C. 2 kg m/s
D. 4 kg m/s
E. none of the above
16. A small compact PD cab is traveling north on Peace Boulevard with momentum p*A. At the intersection of Peace Boulevard and 4th street it collides with an Armak Jeepney, traveling with momentum p*B. Treating each vehicle as a particle, the magnitude of total momentum before collision ___.
A. p*A+p*B
B. p*A-p*B
C. p*A^2+p*B^2
D. Square root of (p*A^2+p*B^2)
17. You throw your cellphone vertically upward with a velocity of 4 m/s. What is its speed at the highest point it can reach?
A. 4 m/s
B. 2 m/s
C. 1 m/s
D. 9.8 m/s
E. 0

18. Which of the following is a scalar quantity?
A. momentum
B. velocity
C. distance
D. acceleration
19. Consider a rock is thrown upward at an angle. It continues to move under the influence of gravity alone. What happens to the vertical component of its velocity as it rises along its curved path?
A. decreases
B. increases
C. stays the same
D. can not be determined
20. The sluggishness or apparent resistance an object offers to changes in its state of motion.
A. Inertia B. acceleration C. mass D. speed
21. Which of the following is true?
A. If the object is moving with constant velocity, the acceleration is increasing.
B. If the object is moving with constant acceleration, the velocity is constant.
C. If the object is moving with constant acceleration, the velocity is changing.
D. none of the above

22. Which of the following statement(s) is/are true about horizontal component of the velocity of the body in a projectile motion?
A. the horizontal component of the velocity is constant.
B. the horizontal component of its motion is independent of the vertical component.
C. the horizontal component of the velocity is constantly decreasing.
D. A & B.
E. none of the above

For 23-24. You were driving a truck in your very vast hacienda. And then suddenly, you discovered the brake is not working. So in order for you to stop you need to hit something: a haystack or a concrete wall.
23. In which situation would the change in your (you and the truck considered as one body) momentum greater?
A. hitting the haystack B. hitting the concrete wall
C. the same amount of change in momentum in either way
D. can not be determined

24. In which situation would you feel greater force?
A. hitting the haystack
B. hitting the concrete wall
C. the same amount of force in either way
D. can not be determined


25. An object moving in a circular path with constant speed has:
A. zero acceleration because the speed is constant
B. a nonzero acceleration because its direction continuously changes
C. not enough information to tell.

PROBLEM SOLVING
1. An airplane flies 1 000 km in a direction 25 degrees west of north from Miami to Atlanta and then 1 200 km in a direction 5 degrees south of wet to Dallas-Fort Worth. Find the net displacement from Miami to Dallas-Fort Worth: (a) using graphical method (scale 1 cm = 200 km)
(b) using component method

2. A rock is thrown down and falls freely into a well with an initial speed of 3.0 m/s. The rock hits the bottom 1.8 s later. (a) How deep is the well (b) What is the rock’s speed as it hits the bottom?
3. A 20-kg block moves along a horizontal surface with 0.61 coefficient of kinetic friction. The block is pulled by a rope that exerts a 162-N tension force at a 37 degrees angle above the horizontal (a) Draw a free body diagram for the block. (b) Write the Second Law of Motion in component form for each axis (c) Solve the equation to find the crate’s acceleration.

4. A 2100-kg sports car traveling North at 20 mi/h has a head-on collision with a 4000-kg station wagon traveling west at 30 mi/h. If the vehicles remain locked together, what is their final velocity (solve the magnitude and describe its direction) ?

5. The average radius of the earth’s orbit around the sun is 1.5 x 10^8 km. The mass of the earth is 5.98 x 10 ^24 kg, and it makes one revolution in 365 days. (a) Calculate the speed of the earth. (b) Calculate the sun’s mass using the Universal law of gravitation.

Phys 11 Assignment #3

Solve the following problems in an orderly manner. Follow the Problem-Solving strategy included in the first Fact Sheet. (Should have diagram with coordinate system shown)
1. An airport runway is 1,000 m long. An airplane must attain a speed of 66 m/s to take off. (a) If the average speed of the airplane down the runway is 33 m/s, for what length of time is the plane on the runway? (b) What is the acceleration of the plane?
2. A stone that is initially at rest is dropped from the top of a building. It falls for 5.0 s before hitting the ground. How tall is the building?
3. The unofficial record for a single jump by a frog was set by a South African sharp-nosed frog that leaped 5 m when being retrieved for placement in its container. If this frog left the ground at an angle of 40 degrees above the ground, what was its initial speed?

Phys 2 DE

Good morning Phys 2 Group I!

Members of group I:
Hafidah Badio
Sitty Arifah Abdul
Rovan Keatzburg Absalon
Riezynn Harvey Isiderio

Your report is about Momentum and Energy. Assign two (2) members as reporters on Monday and two (2) other members on Tuesday.
Be sure to define the following terms:
Momentum
Impulse
Impulse-Momentum Theorem
Work
Energy
Mechanical Energy
Gravitational Potential Energy
Kinetic Energy

Also include some numerical examples.
:)

Lost and Found Calculator

Lost and Found Calculator.
It was found on March 12, 2011.
The owner might have been enrolled in Phys 21.1 section mn or op

To claim, feel free to visit our office, Room 228, Physics Department.

Nat Sci 1 - Rr TOP 5 students!

Nat Sci 1 - Tt2 TOP 5 students!

Phys 11.1 - GH Final Exam Result

TOP 5 SCORES
Name ~~~~~~~~~~~~~~~~~Score
JIMENEZ, Jessie Ocay ~~~~ 86
AMARAN , Ritchel Acoyno ~~~~ 84
LOQUERE, Rose Antoneth Frutas ~~~~ 80
BUBONG, Sittie Monisa Musa ~~~~ 76
GOMEZ, Rosalie Napila ~~~~ 74

=========================================================
codename ~~~~~~~~~~~~ Score
arbaineken@yahoo.com ~~~~~ 48
baby girl ~~~~~ 55
DOORKNOB ~~~~~ 54

fafart ~~~~~ 57
JAZEN ~~~~~ 64
kindly_26 ~~~~~ 67

Leph ~~~~~ 48
Mohayza23~~~~~ 43
mr. iqc ~~~~~ 60

P6 11 ~~~~~ 56
pyar ~~~~~ 33
redgurl ~~~~~ 71

sarah_anne ~~~~~ 73
sunako ~~~~~ 25
ZERO_10 ~~~~~ 41


Highest Possible Score: 105
Items: 98
Passing Score: 49

Japan Earthquke Shifted Balance Of The Planet: Japan Now Closer To U.S.

Here's some of the latest informations brought to us by Science.

The planet’s axis changed with the Japanese earthquake.

The quake caused a rift 15 miles below the sea floor that stretched 186 miles long and 93 miles wide, according to the AP. The areas closest to the epicenter of the quake jumped a full 13 feet closer to the United States, geophysicist Ross Stein at the United States Geological Survey told The New York Times.

The 9.0 magnitude quake (the fourth-largest recorded since 1900) was caused when the Pacific tectonic plate dove under the North American plate, which shifted Eastern Japan towards North America by about 13 feet The quake also shifted the earth’s axis by 6.5 inches, shortened the day by 1.6 microseconds, and sank Japan downward by about two feet. As Japan’s eastern coastline sunk, the tsunami’s waves rolled in

References:
Japan’s earthquake shifted balance of the planet by Liz Goodwin
Liberaland

Phys 11.1 - CD Final Exam Result

Phys 11.1 - CD
Every Monday 8:30-11:30am
Room 233

Congratulations to the top 3 students in final exam! :)

Top 3 Scores
Scores ~~~ NAME
75 ~~~~~~ DELOSTRICO, Aihrolyn Claire Agawin
72 ~~~~~~ ODTOJAN, katrina Marie Geotina
63 ~~~~~~ MACARIMBANG , Sherryhan Baraontong

------------------------------------
Codename ~~~~ score
Athena ~~~~ 57
bb_zhen"17 ~~~~ 55
Bubbles ~~~~ 49

conbo 888 ~~~~ 55
eMz ~~~~ 51
Melabs ~~~~ 52

Mr. Frustrated ~~~~ 29
Private Secretary ~~~~ 51
quing'sim ~~~~ 35

Sad_movies_24 ~~~~ 39
Sharplight ~~~~ 49
200759369 ~~~~ 44

199804446 ~~~~ 39

Highest Possible Score: 105
Items: 98
Passing Score: 49

Nat Sci 1 - Tt2 Final Exam Result

This is the list of scores
Nat Sci 1 - Tt2 (Class sched: Tue and Fri 7am-8:30am)
Room 235

Congratulations to the students who got the top 5 scores! :)

TOP 5 SCORES
rank ~~~ Name~~~~~~~~~~~~~~~~~~~~~~~~~Score
Top 1 JUAYANG, Chaim Azriel Lecera 112
Top 2 BAGUIO, Judale Gozon 95
Top 3 PLAZA, Richie Anne Bontor 94
Top 4 IPA, Moamar Macaindig 90
Top 4 MACAPODI, Sittie Nurbaeyani Pama 90
Top 5 ELLEN, Cindy Berongoy 88
Top 5 ORFANO, Chelian Atienza 88

ID no. ~~~ Score

200535624 ~~~ 72
200850011 ~~~ 74
201023375 ~~~ 76

200956056 ~~~ 48
200952419 ~~~ 76
201031889 ~~~ 73

201027538 ~~~ 82
200928242 ~~~ 69
201024234 ~~~ 76

200956171 ~~~ 52
200848450 ~~~ 65
201024796 ~~~ 84

200846843 ~~~ 57
200839718 ~~~ 48
200954208 ~~~ 60

200953370 ~~~ 74
200953527 ~~~ 64
200954284 ~~~ 80

200952924 ~~~ 78
201026269 ~~~ 66
200848206 ~~~ 54

201027159 ~~~ 72
201023035 ~~~ 82
200955989 ~~~ 69

201031936 ~~~ 56
201026697 ~~~ 56
200850701 ~~~ 44

200956353 ~~~ 76
200850107 ~~~ 50
201009150 ~~~ 84

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

Nat Sci 1 - Rr FINAL Exam Result

Nat Sci 1 - Rr (class Sched: Wed and Sat 4:00-5:30pm)
Room 235 (or 234 sometimes)

Congratulations to the students who got the top 5 scores!

scores ~~~TOP 5 SCORES
100 ~~~ 100HADJI TAIB, Aquisa Bangon
88 ~~~ ABUBACAR, Norhanah Mama
88 ~~~ CATACUTAN , Glyceryl Canda
86 ~~~ ESCATRON, Nikki Acuña
84 ~~~ ABDUL, Janisah Macapodi
82 ~~~ ALCALDE, Geophychem Lanzado

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
codename/ID no. ~~~ Score
200847095 ~~~ 69
200847363 ~~~ 72
200952974 ~~~ 74

200954039 ~~~ 62
200954305 ~~~ 42
201016689 ~~~ 79

201024511 ~~~ 63
ASHLEH ~~~ 64
BOK ~~~ 50

cho25 ~~~ 65
Hannae ~~~ 74
JK ~~~ 69

md ~~~ 80
PaLoZ ~~~ 80
PEEJAY_GALO ~~~ 76

unemode 88 ~~~ 70
Winx ~~~ 65
xhicks ~~~ 67

Yoona ~~~ 71

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