Well today we viewed a couple more presentations!
We had a dose of the Mars Mission from Oliver...
and a presentation on telescopes from Sergio.
After we moved on to a couple of the sheets that Kizoriz handed out.
Well that pretty much sums it up.
Have a good weekend.
The next scribe will be...
Mr SiwWy
PS. Afternoon class worked on the Charges, Voltage, Energy lab from the green book.
Make sure you read the notes on potential, potential energy, potential difference.
Note the difference among them (pardon the pun :))
Showing posts with label space exploration. Show all posts
Showing posts with label space exploration. Show all posts
Sunday, December 9, 2007
Thursday, December 6, 2007
More Presentations...
The title pretty much says it all... Today we had a couple more groups/individuals present their projects. We seem to be learning quite a bit about the Mars Exploration, but we also got to see a bit of Metaphysics from Grey-M and Aichelle.
Remember, all groups should hand in a self evaluation which includes a mark out of 10 for Presentation, a mark out of 40 for the total Project, and explanations as to why they deserve such a mark.
That's all for today... I have to work now, so I'll see you all tomorrow where we will finish the remaining presentations and GREY-M will be scribing about them =D
Remember, all groups should hand in a self evaluation which includes a mark out of 10 for Presentation, a mark out of 40 for the total Project, and explanations as to why they deserve such a mark.
That's all for today... I have to work now, so I'll see you all tomorrow where we will finish the remaining presentations and GREY-M will be scribing about them =D
Wednesday, December 5, 2007
Scribing time!
Ok, so today was pretty straight forward....it was presentation day! Craig and I started off the class with our presentation of Cosmology using iMovie which was pretty awesome if I do say so myself ;). Next to go was our vice President Vincent! He did his presentation using power point. His was very in depth and he used amazing video's and pictures to get his points across. Last but not least (in any way) was Chris Cadonic's presentation using power point as well. His was on Special and General Relativity and had the basic details of a very well planned lecture. He was able to take a very complicated subject and actually explain it in terms our class understood, even using classmates as examples. His project actually ended up taking the rest of the class but I don't think that anyone really mind, especially Sergio. XD! So I guess that covers what happened in physics today, all the others who still need to present good luck! and the next scribe is.......CRAIG!
Monday, December 3, 2007
Tuesday, November 27, 2007
Monday, November 26, 2007
Thursday's Scribe
Sorry guys for the late scribe! Well, friday's class was pretty straight forward. For those of you who were not in class on friday, we went over several sheets and corrected them. Artificial Satellites, Chapter 14: satellite motion, Chapter 10 Gravitation and the duck book questions. Ms. K also mentioned how happy she was to not see Sergio for 3 days! ..
The correction for questions 28 to 33 on page 227 are on the slides.
The next scribe iss.. hall of fame?
The correction for questions 28 to 33 on page 227 are on the slides.
The next scribe iss.. hall of fame?
Thursday, November 22, 2007
Wednesday nov. 21 scribe post
Sorry for being a day late. Heres the day's scribe.
During that class we were introduced to new equations:
During that class we were introduced to new equations:
We also watched the "same-same-guy" video about satellite motions.
Many of the things that we being discussed in the video were review and only a few new topics.
Also Ms K. gave us worksheets.
For thursday's scribe, i picked sandy... i think i told her she was the scribe already but just a reminder.
Tuesday, November 20, 2007
Gravitational Potential Energy
Okay, in class today, Mrs. K handed back our Transparency Worksheet. After that, we looked over the notes she handed out yesterday.
Gravitational Potential Enegy
From the past unit, we learned two formulas for Potential Energy:
Ep=mgh and Es=1/2kx2
Here's another one that we learned from class today.
PEg= -(Gm1m2)/R
From the Newton's Law of Universal Gravitation Fg= Gm1m2/R, we increases the separation distance from R1 to R2. It requires work and when it is done, the gravitational PE increases.
Derivation of PEg formula:
PEg = ((-Gm1m2)/R2) - ((-Gm1m2)/R1)
Gravitational Potential Well
- two objects that has force of attraction between them having negative potential energy.
- it should rise out of the Earth's potential well to be free of the gravitational force.
For example: If one of the masses is the Earth then the other mass is on Earth's ground level, the total energy is just the PEg since KE = 0 J.
Total Energy = KE + PEg
If the object rises from the Earth's ground level, it would have both PEg and KE, so then, the total energy = KE + PEg.
Escape Velocity
- the minimum velocity of an object to escape from Eath's potential well.
To calculate escape velocity, KE = - PEg but we take the absolute value of the PEg to have a positive velocity so then it will be KE = |-PEg|.
let's say m1=mass of the object, v1=velocity of the object, m2=Earth's mass, R=Earth's radius, G=gravitational constant.
KE= 1/2 m1v12
PEg= - Gm1m2/R
1/2 m1v12 = Gm1m2/R
v1 = √(2Gm2)/R (m1 will reduce)
Total Energy and Binding Energy
Binding Energy - amount of additional kinetic energy an object needs to escape.
- it is equal to the negative of gravitational potential energy
on Earth's ground level Et = - Gm1m2/R
so, Eb = Gm1m2/R
if an object is in orbit at any radius R1, Fc keeps the object in circular orbit and Fg provided the force attraction between the object and Earth.
Fc=Fg
m1v12/R1 = Gm1m2/R12 (R12 will reduce to R1)
m1v12 = Gm1m2/R1
the Et of the orbiting object is
Et = KE + PEg
Et = 1/2 m1v12 + (-Gm1m2/R)
since m1v12 = Gm1m2/R1
Et = 1/2 Gm1m2/R1 + (-Gm1m2/R)
Et = -1/2 Gm1m2/R1 or Et = 1/2 PEg
so then the binding energy is Eb = 1/2 Gm1m2/R1
After the discussions, she handed out a worksheet called 'Gravitational Potential Energy Questions'.
Here are the solutions.
1.) PEg = - Gm1m2/R
= (- (6.67 * 10-11)(500)(5.98 * 1024))/ (6.37 * 106)
= -3.13 * 106 J
2.) Et = Ek + Ep
= 1/2 m1v12 + ( - Gm1m2/R1)
= - 1/2 (Gm1m2/R1)
= - 1/2 ((6.67 * 10-11)(5.98 * 1024)(500))/ (4.22 * 107)
= - 2.36 * 109 J
3.) Etave. = Et(in orbit) - Et (on Earth)
= -2.36 * 109 - (-3.13 * 1010)
= 2.89 * 1010 J
4.) Eb = 2.36 * 109 J is needed to remove satellite from Earth's orbit.
5.) Ep = - Gm1m2/R
= (- (6.67 * 10-11)(5.98 * 1024)(2000))/ (6.38 * 106 + 400 * 103)
= -1.18 * 1011 J
Before the end of class, she handed out notes about Escape Speed and asked us to do Questions 28,29,30,31,32,33 in the duck book. I guess this is the end of my post, I hope i covered everything.
Next scribe is Russel L.
Gravitational Potential Enegy
From the past unit, we learned two formulas for Potential Energy:
Ep=mgh and Es=1/2kx2
Here's another one that we learned from class today.
PEg= -(Gm1m2)/R
From the Newton's Law of Universal Gravitation Fg= Gm1m2/R, we increases the separation distance from R1 to R2. It requires work and when it is done, the gravitational PE increases.
Derivation of PEg formula:
PEg = ((-Gm1m2)/R2) - ((-Gm1m2)/R1)
Gravitational Potential Well
- two objects that has force of attraction between them having negative potential energy.
- it should rise out of the Earth's potential well to be free of the gravitational force.
For example: If one of the masses is the Earth then the other mass is on Earth's ground level, the total energy is just the PEg since KE = 0 J.
Total Energy = KE + PEg
If the object rises from the Earth's ground level, it would have both PEg and KE, so then, the total energy = KE + PEg.
Escape Velocity
- the minimum velocity of an object to escape from Eath's potential well.
To calculate escape velocity, KE = - PEg but we take the absolute value of the PEg to have a positive velocity so then it will be KE = |-PEg|.
let's say m1=mass of the object, v1=velocity of the object, m2=Earth's mass, R=Earth's radius, G=gravitational constant.
KE= 1/2 m1v12
PEg= - Gm1m2/R
1/2 m1v12 = Gm1m2/R
v1 = √(2Gm2)/R (m1 will reduce)
Total Energy and Binding Energy
Binding Energy - amount of additional kinetic energy an object needs to escape.
- it is equal to the negative of gravitational potential energy
on Earth's ground level Et = - Gm1m2/R
so, Eb = Gm1m2/R
if an object is in orbit at any radius R1, Fc keeps the object in circular orbit and Fg provided the force attraction between the object and Earth.
Fc=Fg
m1v12/R1 = Gm1m2/R12 (R12 will reduce to R1)
m1v12 = Gm1m2/R1
the Et of the orbiting object is
Et = KE + PEg
Et = 1/2 m1v12 + (-Gm1m2/R)
since m1v12 = Gm1m2/R1
Et = 1/2 Gm1m2/R1 + (-Gm1m2/R)
Et = -1/2 Gm1m2/R1 or Et = 1/2 PEg
so then the binding energy is Eb = 1/2 Gm1m2/R1
After the discussions, she handed out a worksheet called 'Gravitational Potential Energy Questions'.
Here are the solutions.
1.) PEg = - Gm1m2/R
= (- (6.67 * 10-11)(500)(5.98 * 1024))/ (6.37 * 106)
= -3.13 * 106 J
2.) Et = Ek + Ep
= 1/2 m1v12 + ( - Gm1m2/R1)
= - 1/2 (Gm1m2/R1)
= - 1/2 ((6.67 * 10-11)(5.98 * 1024)(500))/ (4.22 * 107)
= - 2.36 * 109 J
3.) Etave. = Et(in orbit) - Et (on Earth)
= -2.36 * 109 - (-3.13 * 1010)
= 2.89 * 1010 J
4.) Eb = 2.36 * 109 J is needed to remove satellite from Earth's orbit.
5.) Ep = - Gm1m2/R
= (- (6.67 * 10-11)(5.98 * 1024)(2000))/ (6.38 * 106 + 400 * 103)
= -1.18 * 1011 J
Before the end of class, she handed out notes about Escape Speed and asked us to do Questions 28,29,30,31,32,33 in the duck book. I guess this is the end of my post, I hope i covered everything.
Next scribe is Russel L.
Monday, November 19, 2007
Sunday, November 18, 2007
orbits
Hey its Ant. Sorry for late post. Been busy with work and family matters. But any who recap of Friday's class.
Mrs. K gave us a wonderful new song to learn with lyrics. Inverse square law by Michael Offut. I will be getting Chris his CD for Christmas. Next we finished off the class with a video on Kepler's three laws. I learned a few things from this video such as Mar's orbit is actually an ellipse and not a circle, Kepler's three laws of, course. They are as followed :
1. r = ED/ 1 + cos θ
2. DA/DT = constant
3. T^2 = (4π^2/GM ) a^3
By the end of class she gave us 3 homework sheets. They are:
1. chapter 11 gravitational interactions
2. concept - development practice page 12-1
3. Universal law of Gravitation
don't forget your projects are due on Wednesday, Dec. 5...i think.
next scribe is JEV
Mrs. K gave us a wonderful new song to learn with lyrics. Inverse square law by Michael Offut. I will be getting Chris his CD for Christmas. Next we finished off the class with a video on Kepler's three laws. I learned a few things from this video such as Mar's orbit is actually an ellipse and not a circle, Kepler's three laws of, course. They are as followed :
1. r = ED/ 1 + cos θ
2. DA/DT = constant
3. T^2 = (4π^2/GM ) a^3
By the end of class she gave us 3 homework sheets. They are:
1. chapter 11 gravitational interactions
2. concept - development practice page 12-1
3. Universal law of Gravitation
don't forget your projects are due on Wednesday, Dec. 5...i think.
next scribe is JEV
Wednesday, November 14, 2007
Scribe - Wednesday, October 14, 2007
Today we did numerous things. First of all we went over the test. The answers are posted on the blog. Next we got a chapter review worksheet to work on followed by a lab called, "The orbit".
A pink sheet was handed out called the Grade 12 physics project: exploration of space.
It is due wednesday dec 5 2007!
worth 50 marks
MUST BE SUMMARY, NOT READING YOUR PROJECT!
Also needs references.
Next scribe is....
111111111!
A pink sheet was handed out called the Grade 12 physics project: exploration of space.
It is due wednesday dec 5 2007!
worth 50 marks
MUST BE SUMMARY, NOT READING YOUR PROJECT!
Also needs references.
Next scribe is....
111111111!
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