Wednesday, May 28, 2008
Tuesday, May 27, 2008
Tuesday, May 27
Today we corrected the Moving Charges Worksheet. I'm feeling so generous so here's the answers:
4) a) Fe and Fg
b) Positive charge
c) Fe = Fg
mg = Eq
q = mg/E = (3.2 x 10-15)(9.8) / (19600)
= 1.6 x 10-18 C
5) B = F/IL
= (0.40) / (20.0)(0.15)
= 0.13 T
6) B = F/IL
= (6.0 x 10-5) / (1.5)(0.50)
= 8.0 x 10-5 T
7) F = BIL
= (5.5 x 10-5)(20.0)(10.0)
= 1.1 x 10-2 N
8) B = F/qv
= (5.6 x 10-13) / (1.6 x 10-19)(2.1 x 105)
= 16.7 T [left]
9) F = Bqv
= (1.2)(1.6 x 10-19)(8.6 x 104)
= 1.65 x 10-14 N [right]
10) B = F/qv
= (4.0 x 10-6) / (1.6 x 10-19)(5.0 x 105)
= 5.0 x 107 T [into the page]
11) q = F/Bv
= (4.8 x 10-14) / (5.0 x 10-2)(2.0 x 106)
= 4.8 x 10-19 C
12)
a) F = Bqv
= (0.080)(1.6 x 10-19)(4.0 x 106)
= 5.12 x 10-14 N
b) R = mv2/F
= (9.11 x 10-31)(4.0 x 106)2 / (5.12 x 10-14)
= 2.84 x 10-4 m
13) v = BqR/m
= (5.0 x 10-4)(1.6 x 10-19)(0.50) / (9.11 x 10-31)
= 4.4 x 107 m/s
We also picked up a Review sheet and a worksheet named "The Path of a Charged Particle in a Magnetic Field." Test on Thursday !
4) a) Fe and Fg
b) Positive charge
c) Fe = Fg
mg = Eq
q = mg/E = (3.2 x 10-15)(9.8) / (19600)
= 1.6 x 10-18 C
5) B = F/IL
= (0.40) / (20.0)(0.15)
= 0.13 T
6) B = F/IL
= (6.0 x 10-5) / (1.5)(0.50)
= 8.0 x 10-5 T
7) F = BIL
= (5.5 x 10-5)(20.0)(10.0)
= 1.1 x 10-2 N
8) B = F/qv
= (5.6 x 10-13) / (1.6 x 10-19)(2.1 x 105)
= 16.7 T [left]
9) F = Bqv
= (1.2)(1.6 x 10-19)(8.6 x 104)
= 1.65 x 10-14 N [right]
10) B = F/qv
= (4.0 x 10-6) / (1.6 x 10-19)(5.0 x 105)
= 5.0 x 107 T [into the page]
11) q = F/Bv
= (4.8 x 10-14) / (5.0 x 10-2)(2.0 x 106)
= 4.8 x 10-19 C
12)
a) F = Bqv
= (0.080)(1.6 x 10-19)(4.0 x 106)
= 5.12 x 10-14 N
b) R = mv2/F
= (9.11 x 10-31)(4.0 x 106)2 / (5.12 x 10-14)
= 2.84 x 10-4 m
13) v = BqR/m
= (5.0 x 10-4)(1.6 x 10-19)(0.50) / (9.11 x 10-31)
= 4.4 x 107 m/s
We also picked up a Review sheet and a worksheet named "The Path of a Charged Particle in a Magnetic Field." Test on Thursday !
Wednesday, May 21, 2008
Today we learned that in order for an object to move from one distance to another distance above the earth's surface, it needs a certain amount of force which increases its gravitational potential energy (work) to raise a mass from d1 to d2.
Electric potential energy is the same thing as when you place a positive charge between parallel plates. The charge is attracted to the negative plate but in order for the plate to move further away a force must be applied upward. Making a second height other than the first. The area of the shaded region between the two heights reps the increase in electric potential energy.
Calculating Electric potential energy.
PE(1)/(force*height1)=(Force)(distance of charge from negative plate)
=?J (amount of electric potential energy the charge has from the -ve plate)
Now you calculate the PE of charge at a second height
PE(2)=(Force)(second distance of charge from negative plate)
=?J(amount of electric potential energy the charge has from the -ve plate at a second distance)
Now to find the total PE b/w the two positions YOU SUBTRACT PE(1) from PE(2). Now the answer doesnt always have to be positive. Only if point B is further away from the negative plate. If point B is closer than it has a loss of PE.
This can be found from the shaded region of the two distances by multiplying the force of both(only if the same force is applied) by the two distances.
So PE is the work that is done in order to move a charge from one place to another.
ELECTRIC POTENTIAL
Electric potential and PE are very different. Electric potential is the potential energy that a charge has at a given point. Which can be found by this equation ( energy,J)/(charge,C)
The quantity is called a volt.
Potential Difference
To calculate the potential difference of a charge once it has moved to another point you must calculate the Electric potential of the first point V(1)=( energy,J)/(charge,C) and the same for the second point V(2)=( energy,J)/(charge,C). Doing the same thing as in Electric potential energy the Voltage of the first point from the voltage of the second point.
DeltaV=V(2)-V(1)
Now the amount of voltage that has changed in the positions of the charge is EQUAL to the amount of work needed to move the charge from one position to the next.
Now we were given a fun worksheet in which we went over in class and a second problem solving sheet which to be finished by tomorrow.
Electric potential energy is the same thing as when you place a positive charge between parallel plates. The charge is attracted to the negative plate but in order for the plate to move further away a force must be applied upward. Making a second height other than the first. The area of the shaded region between the two heights reps the increase in electric potential energy.
Calculating Electric potential energy.
PE(1)/(force*height1)=(Force)(distance of charge from negative plate)
=?J (amount of electric potential energy the charge has from the -ve plate)
Now you calculate the PE of charge at a second height
PE(2)=(Force)(second distance of charge from negative plate)
=?J(amount of electric potential energy the charge has from the -ve plate at a second distance)
Now to find the total PE b/w the two positions YOU SUBTRACT PE(1) from PE(2). Now the answer doesnt always have to be positive. Only if point B is further away from the negative plate. If point B is closer than it has a loss of PE.
This can be found from the shaded region of the two distances by multiplying the force of both(only if the same force is applied) by the two distances.
So PE is the work that is done in order to move a charge from one place to another.
ELECTRIC POTENTIAL
Electric potential and PE are very different. Electric potential is the potential energy that a charge has at a given point. Which can be found by this equation ( energy,J)/(charge,C)
The quantity is called a volt.
Potential Difference
To calculate the potential difference of a charge once it has moved to another point you must calculate the Electric potential of the first point V(1)=( energy,J)/(charge,C) and the same for the second point V(2)=( energy,J)/(charge,C). Doing the same thing as in Electric potential energy the Voltage of the first point from the voltage of the second point.
DeltaV=V(2)-V(1)
Now the amount of voltage that has changed in the positions of the charge is EQUAL to the amount of work needed to move the charge from one position to the next.
Now we were given a fun worksheet in which we went over in class and a second problem solving sheet which to be finished by tomorrow.
Friday, May 16, 2008
Thursday, May 15, 2008
Thursday, May 15, 2008
Today we read about Coulomb's Law in the green textbook and worked on a few practice questions. We also handed in several textbook questions for marks, using Coulomb's Law to calculate the force between two charges. This took up the majority of the period and the class packed up waaay too early today!
May 15, 2008
It seems to me that my fellow physics friends forgot to scribe again so I'll do a good deed and grab myself some BONUS marks. First, we started our new unit about electric and magnetic fields. We described the similarities and difference about Newtons gravitational law and coulombs law. Second, we had to read pages 415-418 on the green book. Also we were assigned to hand in some questions which is due for tomorrow.
Monday - May 12, 2008
So I'll also be doing the scribe for May 12.
On Monday, we went over the questions in the green textbook; 17, 20, 21, 22, and 23 on the board. It took a while and so afterwards, near the end of class, we watched a short video about space.
On Monday, we went over the questions in the green textbook; 17, 20, 21, 22, and 23 on the board. It took a while and so afterwards, near the end of class, we watched a short video about space.
Friday - May 9, 2008
So on this day we also went over some worksheets and were assigned the questions 17, 20, 21, 22, and 23 in the green textbook on page 172. We also got to see one presentation today from Ethan which was about Mars Exploration. Good job by the way Ethan.
Thursday - May 8, 2008
So I know this was a week ago but no one has scribed for this date so I thought I would do it. Since it was almost a week ago I don't remember much so this scribe will be pretty short.
All right, so on May 8 we watched a film and had to make 5 points about it which we handed in afterwards. We also corrected some sheets and that was it.
All right, so on May 8 we watched a film and had to make 5 points about it which we handed in afterwards. We also corrected some sheets and that was it.
Wednesday - May 14, 2008
I don't know if someone else was supposed to do this so I will. So today we had a test on Space Exploration. It took the entire period and that was basically it !
Tuesday, May 13, 2008
May 13, 2008 AKA Judgement Day
Since i think Lauressa forgot to scribe for today`s class, I`m going to pick up the slack and do it. First, we watched a video about weightlessness. It talks about a group of students that conducted an experiment in zero gravity. We then had to write 4 points regarding this video. Second, Ms. K did a mini review on our space exploration unit. The slides are posted on the blog. Lastly, study hard and good luck on the test. Now, Im gonna play games on my computer. Its been a long time since i played due to the fact that i had to study for that evil Ap exam.
Thursday, May 8, 2008
Wednesday May 7, 2008
No class on Tuesday
On Wednesday, Lauressa did a presentation on Jupiter. It took a while before they got it to open but it was worth the wait. Good job Lauressa an a special thanks to Ms. K, Mark, and Sam. After, we corrected the gravitational fields worksheet on the board. The last thing we did was go over the answers for the chapter 8 review.
That's all!
On Wednesday, Lauressa did a presentation on Jupiter. It took a while before they got it to open but it was worth the wait. Good job Lauressa an a special thanks to Ms. K, Mark, and Sam. After, we corrected the gravitational fields worksheet on the board. The last thing we did was go over the answers for the chapter 8 review.
That's all!
Friday MAY 2, 2008
hmmmmm... no one seems to be scribing these days
it looks like someone forgot to scribe for friday so i think i'll do it
Friday was presentation day!
First up was Rizzle and Jenny and they researched Pluto. It seems Pluto is no longer a planet. It's more like a satellite for Neptune and Pluto's name is now a number. Some sad stuff.
Sam and Van's project was space disasters. Their project was very interesting and was really funny. Too bad their video didn't work. Something wrong with the internet (or maybe Mark's computer j/k)
Mark did a presentation on the development of telescopes. He had a lot of great information to share with the class.
Lastly, Lina did a presentation on cosmology. It was great and very informative. Don't worry Lina, you did fine.
That's all the presentations we had time for.
it looks like someone forgot to scribe for friday so i think i'll do it
Friday was presentation day!
First up was Rizzle and Jenny and they researched Pluto. It seems Pluto is no longer a planet. It's more like a satellite for Neptune and Pluto's name is now a number. Some sad stuff.
Sam and Van's project was space disasters. Their project was very interesting and was really funny. Too bad their video didn't work. Something wrong with the internet (or maybe Mark's computer j/k)
Mark did a presentation on the development of telescopes. He had a lot of great information to share with the class.
Lastly, Lina did a presentation on cosmology. It was great and very informative. Don't worry Lina, you did fine.
That's all the presentations we had time for.
Monday, May 5, 2008
Today we...
Had another substitute teacher!!!
The first thing that occurred was that he gave us the answers to the Universal Law of Gravitation worksheet.
Afterwards he gave us a few handouts and assignments.
We got an information sheet called, "Mass of a Central Object and Radius of Motion of a Satellite". According to the sheet itself, we can determine the mass of our sun by knowing the mean radius of orbit and period of motion of our own earth.
From the Green Textbook, we are to do problems number 6, 7, 11, 13, and 18 on page 172.
We also got a review sheet where we have to do questions 1, 2, 3, 5, and 6 only.
That is it, that is all. Remember, no classes tomorrow afternoon. Have fun on your day off and don't forget to do your homework!
The first thing that occurred was that he gave us the answers to the Universal Law of Gravitation worksheet.
Afterwards he gave us a few handouts and assignments.
We got an information sheet called, "Mass of a Central Object and Radius of Motion of a Satellite". According to the sheet itself, we can determine the mass of our sun by knowing the mean radius of orbit and period of motion of our own earth.
From the Green Textbook, we are to do problems number 6, 7, 11, 13, and 18 on page 172.
We also got a review sheet where we have to do questions 1, 2, 3, 5, and 6 only.
That is it, that is all. Remember, no classes tomorrow afternoon. Have fun on your day off and don't forget to do your homework!
Thursday, May 1, 2008
May 01, 2008
Hi fellow physics people. Happy first day of May! I will scribe for today I suppose.
Well that's it! I look forward to seeing the presentations tomorrow.
So the first thing that happpened was to see who finished their presentations. From all the sideway glances and blank stares, you could tell who didn't. However Rosel was the only one who presented today and her project on the development of the telescope was brilliant. Good Job!
Afterwards, we worked on the worksheets that we recieved from the substitute teacher yesterday. Then we went over the four questions on the worksheet, Universal Law of Gravitation. It was pretty straight forward. One thing that I found particularly interesting was the formula derivation to make answering the last question easier. I have illustrated it for people here.
Well that's it! I look forward to seeing the presentations tomorrow.
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