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Transcript of January 25, 2010 (#90) Need: Books/Notebooks. Continue to Build a better understanding of Electric...
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January 25, 2010 (#90)Need: Books/Notebooks
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Continue to Build a better understanding of Electric and Magnetic Field behaviors
Connection between Magnetic Fields and the Earth as well as Technology
Describe the relationships among the three components of electricity.
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For those of you that find this topic interesting, at the conclusion of today's lesson, there will be some extensions you can pursue in learning more about Magnetic Fields, Reversals, and maybe, a touch of SciFi regarding 2012.
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Modern Marvels Renewable Energy P2
Bell Work QuestionsConnecting Renewable Energy to
Magnetic Fields▪ History of the Earth – Paleomagnetism FINISH ▪ Technology – Cracking the Code (Binary Code)
How are Magnets MadeMagnetic Fields Continued Continue Who killed the electric car? Work on Building Layer For those done, National Geographic Article. Read,
Review, Summarize, Comment
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Enjoy today’s Problem of the Day Video!
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Solar Energy has the potential to help the US with it’s energy demands. However, there are some drawbacks to the current silicon type panels. What do you think is the biggest concern for people interested in them?
A. They are too fragileB. People do not like the look of themC. They are too expensiveD. Not sure/Do not know
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Are there any areas in the USA that you think would/could benefit from such a Renewable Energy Source?
C.B.
D.
A.E.
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Observing Iceland’s use of Geothermal energy, gives us a great way of discussing Igneous rock formation and the field of Paleomagnetism.
First, addressing Earth’s Magnetic Field.
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Earth’s many layers are the accepted cause of what causes the Magnetic Field surrounding the Earth.
-The Core clip
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A movie called THE CORE, attempted to explain what might happen on Earth if the Magnetic Field was ever disrupted.
You be the judge as to how accurate it is.
22:20 - 28:00
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Watch Video Clip Magnetic Field Animation
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Surrounds every electric charge and exerts a force (Magnetically)
In this case large amounts of hot metal moving past one another, creates a Magnetic Field
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Thanks to this field, the Earth is shielded from Solar Wind (Radiation)
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Join the new Bill Nye Show in observing what he considers to be a famous discovery.
http://science.discovery.com/videos/100-greatest-discoveries-shorts-magnetic-field-reversal.html
So, what do you think about the Earth’s Magnetic Field Reversing? How about Fading?
http://news.nationalgeographic.com/news/2004/09/0909_040909_earthmagfield.html
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Video Clip - Magnetic Pole Movement
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The Magnetic Field has reversed about every 200,000 to 300,000 years
It has been about 780,000 years since the last reversal
Pole Wanders at about 40miles a year Reversals are always predicated by a
reduction in the fields strength The field has reduced 10% in the last
150 yrs Some reductions are followed by
increases in strength. Are we due? Who knows!
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Back in the Early 1950’s Edward A. Irving, a Canadian paleomagnetism specialist, used paleomagnetic studies to support plate tectonics (Movement of Crustal Plates 1 cm per year).
The method of identifying polar reversals by examination of oceanic crust was further developed by Frederick John Vine.
Let us examine what he discovered.Mind you this is old footage!
Paleomagnetism Video Clip.
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Video Clip – South Atlantic
Video Clip – SFS2 With Arrows
Video Clip – SFS4 Pole Reversals
Video Clip – SFS5 Arrows and Chart
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See if you can figure out where the center of the Mid-Atlantic Ridge is.
Using the magnet, run the magnetic “Boat Sensor” over the sea-floor.
For each section, call out whether it is Normal (Repelling) or Reversal (Attracting)
Work Together to figure out the location of the ridge/Spreading Center
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Many studies and research shows that the planets magnetic field has reversed and faded throughout the history of the planet.
Some current models show this situation.
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Hematite- Mined as the main ore in Iron
Magnetite- or Loadstone, most magnetized naturally occurring mineral
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Most metals have domains that are randomly placed
Being magnetized arranges the domains into one direction
Screw driver rubbed on a magnet becomes magnetic
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How have humans discovered that the Earth’s Magnetic Field has changed?
A. They waited for their compasses to change direction
B. They watched birds flying E to W instead of N to S
C. They observed iron particles in newly formed rock
D. They looked for changes in the iron orientation on the ocean floor
E. Not Sure
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Binary Code. First introduced in the 11th century –
Shau Yong-philosopher (Not used in math)
200BC – Indian writer Pingala-develops binary numeral system
1605 – Francis Bacon created a system where letters of alphabet could be assigned binary digits
Late 1930’s, George Stibitz, working on the “Model K” computer, which calculated using binary addition.
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First, remember that the code (program) originally worked with switches, either turned on (1) or off (0). Only those two figures are used.
So, to begin, we will count, and in counting, we will start with Zero (0).
Number O = Binary Code ONumber 1 = Binary Code 1Pretty hard huh?
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Continue on…Number O = Binary Code 0Number 1 = Binary Code 1Number 2 = Binary Code 10Number 3 = Binary Code 11Number 4 = Binary Code 100Number 5 = Binary Code 101Number 6 = Binary Code 110Number 7 = Binary Code 111Number 8 = Binary Code 1000
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Using a Hexidecimal and Decimal System combined with Binary we can get letters
Hex Dec Binary0 0 00001 1 00012 2 00103 3 00114 4 01005 5 01016 6 01107 7 01118 8 10009 9 1001A 10 1010B 11 1011C 12 1100D 13 1101E 14 1110F 15 1111
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NanotechnologyThe biggest science initiative
since the Apollo program
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10 GB2001
20 GB2002
40 GB2004
80 GB2006 160 GB
2007
Example: Data storage capacity of the iPod
Hard driveMagnetic data storage
Uses nanotechnology!
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Hard Disk Drives - a home for bits
Hitachi
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Magnetic Data StorageA computer hard drive stores your data magnetically
Disk
N S
direction of disk motion
“ Write”Head
0 0 1 0 1 0 0 1 1 0 _ _
“ Bits” ofinformation
NS
“ Read”Head
Signalcurrent
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Using the Homemade “Reader Heads,” Walk around the room with a partner or two and collect answers to questions that have answers given in binary code. Most answers will be in Number form.
Use the code on the top of the reader, and collect answers to your papers.
There are only 10 questions.
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Improving Magnetic Data Storage Technology
• The UMass Amherst Center for Hierarchical Manufacturing is working to improve this technology
Granular Media
PerpendicularWrite Head
Soft Magnetic UnderLayer (SUL)
coil
Y. Sonobe, et al., JMMM (2006)
1 bit
• CHM Goal: Make "perfect" mediausing self-assembled nano-templates• Also, making new designs for storage
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
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10 GB2001
20 GB2002
40 GB2004
80 GB2006 160 GB
2007
So, how does Apple get more storage?
Hard driveMagnetic data storage
Uses nanotechnology!
By Making the Magnets Smaller!!
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Konarka
Benefit: Sun is an unlimited source of electronic energy.
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Please check out the teams website for further studies and ideas regarding the chance that the planet’s magnetic field is in the process of reversing, or just preparing to strengthen again.
http://homeworkteam71.wikispaces.com/
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Notice the name on the poster to the right
Notice that guy and his name, that would be 1992, 8th Grade!
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Video on How Magnets Are made