Tuesday, May 18, 2010

so today in class we went over the rest of the questions on the moving charges worksheet. the answers for 12-16 are the following:

12 a) 5.12 x 10^-14 N
b) 2.85 x 10^-4 m
13) 4.39 x 10^7 m/s
14) 5.3 x 10^5 m/s
15) 1.3 x 10^8 m/s
16) 360 Volts

then we had a fire drill and then we went over chapter 27 study guide. the answers are posted below.

1) 1.42 x10^4 m
5) 2.6 x 10^6 m/s
6 a) 4.3 x 10^4 m/s
b) 1290 N/c
7) 1.92 x10^-16 kg
8) 15 m

good luck on the test tommorrow.
and the next scribe is SAYANA


hahaha hao gao :D

Electric and Magnetic Fields

Hey everyone sorry for missing fridays post but i dont even remember what happened on friday so i will do todays instead!

So today in class we corrected a few sheets we were handed on friday i think.

The path of a charged particle in a magnetic field
Physics of a cathode ray tube
moving charges worksheet

I only have the answers for the moving charges so yeah

The next scribe is kasey

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Magnetic Fields & Electric Potential

Hi guys.. I didn't know I was the next scribe. :) Anyway, here's what we did in today's class:

• Ms. K handed back the homework from p. 423 (#17) on the green booklet about Electric Fields that was worth 5 marks.

• We corrected the Concept-Development Practice Page 33-2 - Chapter 33: Electric Fields and Potential. It's the double sided sheet with drawings on it.

Electric Potential:

1. KE=decrease in PE
2. force, distance, W=Fd, increases, equal
3. Potential, Voltage
4. 1 V
5. 12 J
6. 5000 V
7. 5000 V
8. 5000 V
9. 0.005 J
10. charge
    

Oh yeah, please highlight this part on the front page of the sheet right after question #2: At any point, a greater quantity of test charge means a greater amount of PE, but not a greater amount of PE per quantity of charge. The quantities PE (measured in joules) and PE/charge (measured in volts) are different concepts. I believe this is an important information about this unit that most students get confused of. :)

• After this, we also did the Electric Potential work sheet from yesterday's class and put the answers on the white board after we were given some time to do it. So here you go:

1. 31 J/C
2. a) 3.6x10^-14 J b) 180 V
3. 12 741 119.27 m/s
4. 3.24x10^-9 J
5. a) 12eV or 1.92x10^-18 J b) 12eV or 1.92x10^-18 J c) 2.05x10^6 m/s

• Then lastly, we got a booklet that has Potential Energy and Kinetic Energy Between Two Charged Plates: Review written at the front and has 4 pages. And another sheet called Physics 40S Electric and Magnetic Fields Assignment - The Physics of a Cathode Ray Tube that may be for hand in tomorrow in class.

** Make sure you've handed in your lab that we did the other day and questions 4&5 on Electric Fields Strength. **

Reminder: Our unit test is on May 19, Wednesday.

Next scribe is Roger

Hello hello!!

1) Today, we corrected Electric Field Strength, questions 1 to 3, the rest of the questions, 4 and 5, are due tomorrow.
2) We watched a short video, here's the link, http://glencoe.com/sec/science/physics/ppp_09/animation/Chapter%2021/Electric%20Potential%20Difference.swf
3) There were four sheets handed out: ELECTRIC POTENTIAL(WORKSHEET), CHAPTER 33:ELECTRIC FIELDS AND POTENTIAL, GRAVITAIONAL POTENTIAL ENERGY(BOOKLET) and a lab worksheet (Chapter 21:Charges, Energy, Voltage), which, I believe, is due tomorrow.

*Two things are to be handed in , Electric Field Strength questions 4 and 5, and Chapter 21, Charges, Energy, Voltage.

Next scribe is Jeamille :D

Tuesday, May 11

Hello everybody! Today we corrected the questions 10, 11, 15 and 16 on page 423. I can't find the sheet that contained all the answers so please find a buddy or a classmate that has them. Mrs. Kozoriz is also an option. Also, Mrs. K made question 17 on page 423 a hand in question. Don't forget to do it !

next scribe is praisia

Elementary Charge

Today in class, we reviewed what we learned last friday.

We discussed Electric and Magnetic Fields, and Coulomb's Law.

Where k equals the constant 9.0 x 10^9, q's are the charges, and R is the distance.

ELEMENTARY CHARGE

electron = 1.6 x 10^-19

proton = 1.6 x 10^-19

The charge of an electron was measured by Robert Millikan. The charge of the electron is the same as a proton, and you have to have a multiple of this charge, because you cannot have half an electron.

1 Coulomb has 6.24x10^18 elementary charge.

In other words, "1 coulomb is a very big number"

ELECTRIC FIELDS

- Like charges repel each other, while opposite charges flow from the negative charge to the positive charge.

We did some examples on the smart board (i'm not sure if ms. K uploaded it)

And after we did the examples, Ms K gave us a handout, that pretty much explained everything we need to know about coulomb's law.

It covered Coulomb's Law in One Dimension, Coulomb's Law in Two Dimension:Equilateral Triangle, Coulomb's Law in Two Dimensions: The Square : The individual Forces & Adding the Forces. So make sure to get the handout from Ms. K if you weren't in class!

After, Ms K instructed us to answer the Practice questions on page 420, #1-5, and Questions # 10, 11, 15, 16, and 17 on Page 423. The questions on Page 423 may be for hand-in, so make sure you finish your homework!

Next scribe is domana

Coulomb's Law

Coulomb's law

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