Exams is in two days. Is everyone ready? My tip; study hard, look over the review sheet, all your tests, while taking 15 minute breaks each for each hour, and most of all, get an early nights sleep.
For the class on Thursday and Friday, all we did was study for the exam. However on thursday some of went to the UofM to apply for a scholarship. And in case you didn't know, if anyone has an average of 80% or above in atleast 5 classes from grade 9 to 12 are eligible. The scholarship qualifies not only for the UofM but Red River and UofW aswell. Talk to Mr. Purpur for more details, and be quick with it! First come first serve.
So I just wanted to wish everyone luck on their exams! GOOD LUCK! =)
Tuesday, June 19, 2007
Tuesday, June 12, 2007
review for last fateful test! & CH 26 review
Chapter 26 review worksheet questions # 1-3 ignore 4&5 # 6-9
Answers on smart board
review for last fateful test! study hard everyone!
test out of 30-35 marks on Electromagnetic Induction including magentic flux, radius's, areas and diameters. need to know how to calculate these using the correct formulas.
A= (3.14)R2
Lenz's Law:
Know it!!
coil and magnet example
also need to know what a traansformer is.
Transformer- convert voltages
Pp=Ps means primary power = secondary power
IpVp=IsVs
Good luck on the test tomorrow and the exam next week
Answers on smart board
review for last fateful test! study hard everyone!
test out of 30-35 marks on Electromagnetic Induction including magentic flux, radius's, areas and diameters. need to know how to calculate these using the correct formulas.
A= (3.14)R2
Lenz's Law:
Know it!!
coil and magnet example
also need to know what a traansformer is.
Transformer- convert voltages
Pp=Ps means primary power = secondary power
IpVp=IsVs
Good luck on the test tomorrow and the exam next week
Monday, June 11, 2007
Friday, June 8, 2007
Scribe
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 :)
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 :)
Wednesday, June 6, 2007
Magnetic Fields
Hello Guys............(english,english).Ok what Ms. K discussed today is all about Magnetic Fields.
-One magnetic line is sometimes called Weber (Wb)
-units of B (magnetic field strength)
-One magnetic line is sometimes called Weber (Wb)
-units of B (magnetic field strength)
One Tesla(T)= one newton/(ampere*meter) or Wb/m2
-One Tesla is about 5 Times the strength of an ordinary bar magnet. The earth's magnetic field is about 5 x 10-5 T (0.00005)
-when we talked about the number of magnetic lines we use the expression Flux, and designate it by the Greek letter "phi"
Electromagnetic Induction
A current set op in a closed circuit located in a magnetic field whenever the total magnetic flux lining the circuit is changing.
Two conditions necessary for an electric current to be produced with a magnetic field:
1. Must have a closed circuit
2. Must have changing magnetic filed
Three factors that determine the value of the induced EMF are
1. Length of the wire
2. Flux density of the field
3. Speed of which conductor moves through field
and the formula....EMF=Blv
and after discussing all of this Jennie and her friend reported about mars exploration,it was supposed to be like past two months ago..
Next scribe would be.... nivram!!!hahahaah
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