Yay...I beat everyone to it. Today in class we started off with a video on Electromagnetic Induction and Alternating Current. The video was approximately half an hour. As we watched the video we filled out a sheet that was filled with questions about the video and we then went over the answers.
After the video we went over study guide number 25 and 26.
We then went over a worksheet titled Grade 12 Physics Worksheet: Electromagnetic Induction
Here are the questions and answers below
1. An airplane travels 1000 km/h in a region where the earth's field is 5.0 x 10-5 T and is nearly vertical. What is the potential difference between the wing tips that are 70 m apart?
EMF= Blv
EMF= (5.0 x 10-5 T )(70 m)(277.78 m/s)
EMF= 0.9722 V
2. A straight conductor 10.0 cm long is moved through a magnetic field perpendicular to the flux at a velocity of 75 cm/s. If the flux density is 0.025 weber/m2, what EMF is induced in the conductor?
EMF= 1.8x10-4 V
3. A rod 15 cm long is perpendicular to a magnetic field of 0.45N/(A)(m), and is moved at right angles to the flux at the rate of 30 cm/s. Find the EMF induced in the rod.
EMF= Blv
EMF= (0.45)(0.015 m)(0.3 m/s)
EMF= o.o2025 V
4. What EMF is induced in a 5.0 cm long wire moving with a speed of 10 cm/s across a field of 0.020 N/(A)(m)?
EMF= Blv
EMF= (0.020)(0.005 m)(0.10 m/s)
EMF= 1x10-4 V
5. A coil of 325 turns moving perpendicular to the flux in a uniform magnetic field experiences a change in flux linkage of 1.15 x 10-5 weber in 0.00100 s. What is the induced EMF?
EMF = 3.74 V
6. How many turns are required to produce an induced EMF of 0.25 V for a coil that experiences a change in flux linkage at the rate of 5.0 x 10-5 weber per second?
50 turns
7. A coil of 75 turns and an area of 4.0 cm2 is removed from the gap between the poles of a magnet having a uniform flux density of 1.5 wb/m2 in 0.025 s. What voltage is induced across the coil?
1.87 V
Class was almost over so we picked up 3 sheets, 21.2 Lenz's Law, Review chapter 26, and Transformers Chapter 37: Electromagnetic Induction. These sheets are to be done for Monday.
* Make sure you have a Physics Exam Review and the answer key.
I think that's it...so have a good weekend :)
Showing posts with label anh. Show all posts
Showing posts with label anh. Show all posts
Friday, June 8, 2007
Monday, April 23, 2007
Scribe
Hey it's Anh for the physics scribe today...so what did we do today?
Well we started off the class with a 20 minute video, which was of course being disruptive by Jennie..haha just kidding. The video was about Johannes Kepler's life and his discoveries. It was sort of like an autobiography.
During the movie we were required to fill out a sheet with 21 questions which are listed below with the answers:
KEPLER'S THREE LAWS VIDEOTAPE
1. What planetary model did Johannes Kepler believe in?
The Copernican model
2. Which planet's orbit did Kepler analyze?
Mars
3. How far off from a circle was the orbit of Mars?
8 minutes of arc or 1/4 of apparent width of the moon.
4. What type of curve can explain the orbit of Mars?
An ellipse
5. In an ellipse, is the total distance from 1 pin to the string and then to the other pin, a constant?
Yes
6. The name given to a single point in an ellipse is the ______.
Focus
7. Focus is the Latin word for ______.
Fireplace
8. How would you describe Kepler's childhood?
Poverty and illness
9. What journey did Kepler undertake in 1600 and for what purpose?
Tycho Brahe
10. What was the main interest of Tycho Brahe?
Astronomy
11. How did Kepler obtain the careful observations that Brahe made during his lifetime?
He stole them
12. Was the Copernican model of the universe easy to justify scientifically?
No
13. What were some of the problems that faced Kepler in discovering the secrets of the sky?
Movement, earth spins on an axis while revolving around the sun.
14. How many pages of calculations did Kepler have?
Over 900 pages
15. What does "in opposition" mean according to the positions of Mars, Earth, and sun?
Mars is seen at the same position, if seen from earth or sun.
16. Can any circle viewed obliquely be termed an ellipse?
Yes
17. In ancient history, which group of people studied conic sections?
The Greek
18. Is a parabola a popular shape in our world today?
Yes
19. In your own words, describe the term eccentricity?
How flat an ellipse is
20. State Kepler's 3 laws.
I Each planet moves as an ellipse with the sun at one focus.
II A line from the sun to each planet sweeps out equal area in equal time.
III T2 is proportional to R3
21. How did Kepler earn money in later life?
Made astronomical charts
So after we went over the video sheet answers we did a lab applying Kepler's ideas which is in the textbook, page 158.
Well we started off the class with a 20 minute video, which was of course being disruptive by Jennie..haha just kidding. The video was about Johannes Kepler's life and his discoveries. It was sort of like an autobiography.
During the movie we were required to fill out a sheet with 21 questions which are listed below with the answers:
KEPLER'S THREE LAWS VIDEOTAPE
1. What planetary model did Johannes Kepler believe in?
The Copernican model
2. Which planet's orbit did Kepler analyze?
Mars
3. How far off from a circle was the orbit of Mars?
8 minutes of arc or 1/4 of apparent width of the moon.
4. What type of curve can explain the orbit of Mars?
An ellipse
5. In an ellipse, is the total distance from 1 pin to the string and then to the other pin, a constant?
Yes
6. The name given to a single point in an ellipse is the ______.
Focus
7. Focus is the Latin word for ______.
Fireplace
8. How would you describe Kepler's childhood?
Poverty and illness
9. What journey did Kepler undertake in 1600 and for what purpose?
Tycho Brahe
10. What was the main interest of Tycho Brahe?
Astronomy
11. How did Kepler obtain the careful observations that Brahe made during his lifetime?
He stole them
12. Was the Copernican model of the universe easy to justify scientifically?
No
13. What were some of the problems that faced Kepler in discovering the secrets of the sky?
Movement, earth spins on an axis while revolving around the sun.
14. How many pages of calculations did Kepler have?
Over 900 pages
15. What does "in opposition" mean according to the positions of Mars, Earth, and sun?
Mars is seen at the same position, if seen from earth or sun.
16. Can any circle viewed obliquely be termed an ellipse?
Yes
17. In ancient history, which group of people studied conic sections?
The Greek
18. Is a parabola a popular shape in our world today?
Yes
19. In your own words, describe the term eccentricity?
How flat an ellipse is
20. State Kepler's 3 laws.
I Each planet moves as an ellipse with the sun at one focus.
II A line from the sun to each planet sweeps out equal area in equal time.
III T2 is proportional to R3
21. How did Kepler earn money in later life?
Made astronomical charts
So after we went over the video sheet answers we did a lab applying Kepler's ideas which is in the textbook, page 158.
And that is where the class and this scribe post ends. Next scribe is Nivram?
bye bye bye bye bye bye bye bye bye bye bye bye
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