Owner: Science Student URL:http://science-student.com Join Date: Fri, 24 Aug 2007 01:35:43 -0500 Rating:0 Site Description: Science student is a blog featuring science notes of all subjects, science news, and a helpful community. Site statistics:Click here
2007-08-24 01:31:44 ss
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2007-08-24 01:21:05 a
Aerogel, Frozen Smoke, is a Breakthrough Substance for Heat Insulation 2007-08-19 09:53:29 Aerogel is a substance made by extracting water from silica gel and then replacing it with carbon dioxide. It is a lightweight solid that is very resistant high temperatures. It has been shown to resist a 1kg blast of dynamite. It is an extremely functional heat insulator. Scientists are still working on applications for the [...] Read more:Frozen
, Smoke
, Breakthrough
, Substance
Movies That Failed Science Class 2007-08-17 22:42:44 ”
Here’s a neat list of some movies and how they ignore common science.
Gravity takes a vacation in Speed: There’s a gap in a freeway bridge with a relatively flat surface. A bus, traveling about 70 mph, crosses that gap, flying along an apparently horizontal path. Gravity was apparently taking a well-deserved break.
Spider-Man’s military genius fails [...] Read more:Science
Looking for Help: Authors and Designers 2007-08-17 10:22:00 I am looking for authors that would like to pitch in on writing notes or articles this fall.
Some ideas:
-Post notes from your Fall semester science classes (great review)
-Post about industry news
-Post something interesting and on topics
Other:
-PHPWordpress designer
-Graphic Designer
I can’t pay anything currently. As some of you may know, you need tons of unique hits per [...] Read more:Designers
Scientists Claim To Have Broken The Speed Of Light 2007-08-16 09:12:47 “Two German physicists claim to have forced light to overcome its own speed limit using the strange phenomenon of quantum tunnelling, in which particles summon up the energy to cross an apparently uncrossable barrier.”
Read the original at [DailyMail]. Read more:Broken
, Speed
Welcome 2007-08-15 21:32:26 This is a new site dedicated to students and ran by students. The goal of this site is to share knowledge and interact as a community of future professionals. Read more:Welcome
Chapter 22: Electric Fields 2007-08-27 16:59:50 The electric field is a vector field
Testing for magnitude of electric field
Use a test charge q at a point
Measure the electrostatic force F
We define the electric field E at the point P due to the charged object as
E = F /q (electric field) (E and F are vectors)
The magnitude of E at point p is [...]
Read more:Chapter
, Electric
, Fields
Chapter 21: Charge is Conserved 2007-08-27 16:53:38 Just like energy and momentum (linear and angular) are conserved, so is charge.
Hence, the Law of Conservation of Charge, charge is neither created or destroyed, only transfered.
Read more:Chapter
Chapter 21: Charge is Quantized 2007-08-27 16:51:19 When a quantity is quantized, it means that the value for that quantity can only have discrete values, it cannot have any value.
A particle’s charge can be +6e or -10e but not +3.57e (see next equation for what e is)
The equation for charge is:
q = ne where n = +/- 1, +/- 2, +/- [...]
Read more:Chapter
Chapter 21: Coulomb’s Law 2007-08-27 16:45:10 When charged particles are brought near each other, they each exert a force on the other
If both particles have the same charge, they will repel each other
If each particle has a different charge, they will attract each other
Electrostatic Force - the force of repulsion or attraction due to the charge properties of objects
Coulomb’s Law - [...]
Read more:Chapter
Chapter 21: Conductors and Insulators 2007-08-27 14:25:42 Conductors - materials through which charge can move rather freely (metals, human body, tap water)
Insulators - materials through which charge cannot move freely (rubber, plastic, glass, chemically pure water)
Super Conductors - materials that are perfect conductors (silicon, germanium)
The properties of conductors and insulators are due to the structure and the electrical nature of atoms
An [...]
Read more:Chapter
Chapter 21: Electric Charge 2007-08-27 14:13:16 Electric charge is an intrinsic characteristic of the fundamental particles making up objects.
There are two kinds of charge: Positive (+) and Negative (-)
If these charges are balanced in a 1:1 ratio, it is said there is no net charge on the object
We say the material is either positively or negatively charged to indicate charge imbalance
Charges [...]
Read more:Chapter
, Electric
Physics 2 Course Notes 2007-08-27 14:04:42 These notes will cover college level Physics
2. This is a calculus based Physics class intended for Physics, science, and Mathematics majors. On Science-Student, I will be posting 15 chapters (chapters 21-35) of notes from the textbook:
Fundamentals of Physics: 8th Edition by Jearl Walker of Cleveland State
[...]
Read more:Notes
69 Physics Resources Online - Courses, Notes, Lectures, Videos, and more 2007-08-26 20:41:23 Here is a massive list of online Physics
resources available online. I want it to be as thorough as possible so if you do not see something that you know of, please comment or email me so I can add it. Enjoy.
Course Notes
, Science Lectures:
MIT OpenCourseware Physics - tons of courses, videos, and material
Berkeley Webcast [...]
Read more:Resources
Strange New Sea Creatures Found In Atlantic 2007-08-26 17:38:43 National Geographic reports:
August 22, 2007—With a fearsome grin fit for a movie monster, this viperfish is a real-life predator that lurks in one of the world’s most remote locations.
An international team of 31 researchers found this and other strange animals while exploring the Mid-Atlantic Ridge, an underwater mountain range that runs from Iceland to the [...]
Read more:Strange
Scientists Interpret Physics Behind Invisibility Cloaks 2007-08-26 17:33:11 Is a perfect invisible cloak theoretically possible? Are there certain wavelengths—such as those in the visible spectrum—that can’t be made invisible? How will using imperfect materials affect the performance of a cloak? Scientists from Zhejiang University and MIT have recently analyzed the physics behind invisibility cloaks in an attempt to answer some of these questions.
Read [...]
Read more:Physics
, Invisibility
Chapter 22: The Electric Field Due to A line of Charge 2007-08-30 10:39:44 A line of charge is considered to be continuous
Linear charge density (lambda) is measured in Coulombs / Meter
A charged ring’s electric field:
E = qz/k(z^2 + R^2)^(3/2)
q= charge of ring
z= distance to point P
R= radius of ring
Read more:Chapter
, Electric
, Field
Chapter 22: The Electric Field Due to a Point Charge 2007-08-30 10:29:48 Some equations (i really need to learn LaTeX):
F = kq(qo)/r^2 (electrostatic force acting on qo)
E = F / qo
E = q / kr^2 (electric field of point charge)
The direction of the electric field is in the same direction of the force on the point charge.
Remember, the electric field is a vector field.
E gives the field at every point around point charge qo.
The Law of Superposition applies to electrostatic force and electric fields:
Net force = F1 + F2 + F3 + Fn
ElectricField
= Fo/qo + F1/qo + F2/qo + Fn/qo
Read more:Chapter
Chapter 22: Electric Field Lines 2007-08-30 10:24:15
The direction of a straight field line or direction of the tangent to a curved field line gives the direction of the electric field at that point.
Field
lines are drawn so that the number of lines per unit area, measured in a plane that is perpendicular to the lines, is proportional to the magnitude of the electric field.
Electric
field lines extend away from positive charge and toward negatively charged particles
An Electric Dipole is a situation where there are two charges equal in magnitude but of opposite signs (see image)
Read more:Chapter
, Lines
The Class of 2007 Posts The Lowest SAT Score in Years 2007-08-30 10:10:32 Sorry Class of 2007, you weren’t as good as the Class of 2006, better luck next time.
The Washington Post writes…
SAT stores dropped 30 points in the District with the Class of 2007, reflecting a downward trend nationwide in the two years since the college entrance test was revised and expanded.
Data released by the College Board yesterday showed that scores declined on all three sections of the test — reading, writing and math — in the District, Maryland and Virginia. Performance in the District, including at private schools, fell 9 points in reading, 10 points in math and 11 points in writing to a combined 1411, reflecting the second consecutive year of decline.
Nationally, the Class of 2007 was the largest and most diverse group of students to take the SAT, which has evolved over the decades from an elite sorting tool into almost a rite of college preparation, the College Board said.
original article here
Read more:Score
, Years
A Great Explanation of String Theory 2007-08-30 09:56:41 Wow, Aaron over at Uncertain Principles has written a great article titled, “What is StringTheory
?”
Read the article and the comments over at Uncertain Principles.
More on String Theory
here.
Read more:Great
Dark Lunar Eclipse - NASA’s APOD 2007-08-30 09:45:22
Explanation: The Moon passed close to the center of Earth’s shadow on August 28th. Seen best by skywatchers in western North America, and the Pacific region, the resulting total lunar eclipse was a dark one, lasting about 90 minutes. In this telescopic image taken near mid totality from Yass, NSW Australia, the 85 kilometer wide ray crater Tycho lies near the top right of the shadowed lunar surface. Of course, even during a total lunar eclipse,the Moon is not completely dark. Instead the Moon remains visible during totality, reflecting reddened light filtering into the Earth’s shadow. The light comes from all the sunsets and sunrises, as seen from the lunar perspective, around the edges of a silhouetted Earth.
originally at NASA
.
Read more:Lunar
20 Million Years Ago A Bee Met An Orchid 2007-08-30 09:41:32 A bee trapped by a glob of sap inside a come-hither orchid up to 20 million years ago has rewritten the evolutionary tale of a flower with the most fanatical following of any plant in the world.
original article here.
Read more:Years
, Million Years
Rock Snot Found in New England 2007-08-28 09:00:22
Yea, that’s rock snot or Didymosphenia geminata. It is a type of invasive algae that spreads out along stream bottoms. It is large, clumpy, and wool-like. Scientists are worried it may kill off other aquatic species because it smothers out their food supply. Apparently, there is no way to kill off the algae. The only way to stop it is to inhibit its growth. Contain the beast.
It has been found in New Zealand, West and South America, and now New England
.
original article here.
Read more:New England
2007-09-22 20:08:21 The problem is probably on what the first reply had. Work smarter, not harder.
1) Examine your professor: Try to understand your teacher. How does he looks at the material? What material does he cover in depth and what material does he quickly cover? Does he make an attempt to be extra clear on anything? Does he follow the syllabus?. Paying attention to the professor will give you incite as to what the teacher is looking for on the exam. It should become more evident and easier to spot after the first or second exam. Often professors may give indirect or even direct hints as to what will be asked on the exam. If a teacher has a low pass rate, be prepared to study often, maybe daily.
2) Prepare for lecture: Reading the material before the teacher lectures about it will help a lot with comprehension. By reading, you will have experienced new vocabulary, concepts, and equations. When the teacher goes over them, you’ll be able to focus on the explanation of the new material
Capacitance: Combinations of Capacitors 2007-09-22 19:59:52
Capacitors in Parallel
When capacitors are connected in series, their total capacitance is equal to the sum of the capacitance of each individual capacitor.
When the potential difference between the capacitors is equal to the potential difference of the battery, the electrons stop flowing and the capacitors are charged.
When a potential difference V is applied across several capacitors connected in parallel, that potential difference V is applied across each capacitor. The total charge q stored on the capacitors is the sum of the charges stored on all the capacitors.
Capacitors in Series
When a potential difference V is applied across several capacitors connected in series, the capacitors have identical charge q. The sum of the potential differences across all the capacitors is equal to the applied potential difference V.
Capacitors that are connected in series can be replaced with an equivalent capacitor that has the same charge q and the same total potential difference V as
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