score int64 10 1.34k | text stringlengths 296 618k | url stringlengths 16 1.13k | year int64 13 18 |
|---|---|---|---|
10 | Writing Equations: Precipitation Reactions
Equations written to represent precipitation reactions can be written in one of three ways:
- In a precipitation reaction a product of the reaction is only slightly soluble, or insoluble. This product is formed as a solid, also known as a precipitate.
- Solubility Rules can be... | http://www.ausetute.com.au/ppteeqtn.html | 13 |
14 | The climate of Uranus is heavily influenced by both its lack of internal heat, which limits atmospheric activity, and by its extreme axial tilt, which induces intense seasonal variation. Uranus' atmosphere is remarkably bland in comparison to the other gas giants which it otherwise closely resembles. When Voyager 2 fle... | http://www.mashpedia.com/Climate_of_Uranus | 13 |
10 | The Kalsun Math Tool for Addition and Subtraction is a simple educational device specially designed with patented features, for early use by children from pre-KG to U.K.G. It is useful for students in special education.
The purposes of the tool are to help children:
- Learn and develop a strong number sense
- Understan... | http://jayavidya.com/kalfun.php | 13 |
30 | Curriculum quality is a key element of IDRA’s Quality Schools Action Framework (Robledo Montecel, 2005). IDRA believes that this key element has to be in place to ensure a quality education for all students, in all content areas, in all schools and at all grade levels.
When you think of quality mathematics curricula, w... | http://www.idra.org/IDRA_Newsletter/April_2006_Curriculum_Quality/_Re-Invigorating_Math_Curricula/ | 13 |
13 | Scientists think that dark energy, the weird force blamed for propelling the universe to
expand at an accelerated speed, probably turned on between 5 and 7 billion years ago. Now astronomers have mapped thousands of galaxies from this era, and have determined the most precise distances to them yet, in an effort to get ... | http://forcetoknow.com/space/map-distant-galaxies-reveal-dark-energy-history.html | 13 |
12 | Prairie Populations is a South Dakota wildlife population census activity for students in grades 5-10.
This activity is designed to provide the students with an open-ended problem solving situation that integrates mathematics and language arts with biology. The activity is designed as a unit that takes the students thr... | http://www3.northern.edu/natsource/DAKOTA1/Prairi1.htm | 13 |
38 | In science and history, consilience (also convergence of evidence or concordance of evidence) refers to the principle that evidence from independent, unrelated sources can "converge" to strong conclusions. That is, when multiple sources of evidence are in agreement, the conclusion can be very strong even when none of t... | http://en.wikipedia.org/wiki/Consilience | 13 |
12 | WHAT ARE DATA PROTOCOLS?
(ISO), OSI and its seven layers. Emphasis will be placed on the first three layers because
they are more directly involved in communication.
Protocols should not be confused with formats. Formats typically show a standard
organization of bits and octets and describe the function of each to achi... | http://search-pdf-files.com/pdf/4726868-control-data-connection-protocols-destination | 13 |
10 | Quasi-stellar radio sources (quasars) are notoriously difficult to study, due to the fact that they are extremely bright, more so than the galaxies which they inhabit. Now, astronomers propose a new method for studying these objects, which can also help them calculate the host galaxy's mass.
Quasars are very active, su... | http://news.softpedia.com/news/Gravitational-Lensing-Enables-Quasar-Measurements-258947.shtml | 13 |
14 | Steven S. Skiena
One way to convert form names to integers is to use the letters to form a base ``alphabet-size'' number system:
To convert ``STEVE'' to a number, observe that e is the 5th letter of the alphabet, s is the 19th letter, t is the 20th letter, and v is the 22nd letter.
Thus one way we could represent a tab... | http://www.cs.sunysb.edu/~skiena/214/lectures/lect21/lect21.html | 13 |
292 | When scientists first began using rockets for research, their eyes were focused upward, on the mysteries that lay beyond our atmosphere and our planet. But it wasn't long before they realized that this new technology could also give them a unique vantage point from which to look back at Earth.
Scientists working with V... | http://history.nasa.gov/SP-4312/ch5.htm | 13 |
22 | PHP - Operators
In all programming languages, operators are used to manipulate or perform
operations on variables and values. You have already
seen the string concatenation operator "." in the Echo
Lesson and the assignment operator "=" in pretty much every PHP example so far.
There are many operators used in PHP, so w... | http://www.tizag.com/phpT/operators.php | 13 |
12 | The asteroid belt surrounds the inner solar system like a rocky, ring-shaped moat, extending out from the orbit of Mars to that of Jupiter. But there are voids in that moat, most notably where the orbital influence of Jupiter is especially potent; any asteroid unlucky enough to venture into one of those so-called Kirkw... | http://www.scientificamerican.com/article.cfm?id=asteroid-belt-planet-migration | 13 |
17 | The basics.Amplifiers have an input impedance. That is the impedance by which it loads the signal source. The nominal impedance is something else. That is the source impedance that the amplifier is designed for. The input impedance may be much higher than the nominal inpedance.
Amplifiers also have an output impedance.... | http://www.sm5bsz.com/lir/nf/nf.htm | 13 |
50 | 1 Basic Electric Circuits Thevenins and Nortons Theorems Lesson 10 2 THEVENIN NORTON THEVENINS THEOREM Consider the following A
Network 1 Network 2 B
Figure 10.1 Coupled networks. For purposes of discussion at this point we consider that both networks are composed of resis tors and independent voltage and current sourc... | http://www.powershow.com/view/25f58-YTk5Y/Basic_Electric_Circuits_powerpoint_ppt_presentation | 13 |
12 | René Descartes (1596–1650)
Discourse on the Method
Discourse on the Method is Descartes’ attempt to explain his method of reasoning through even the most difficult of problems. He illustrates the development of this method through brief autobiographical sketches interspersed with philosophical arguments.
Part 1 contain... | http://www.sparknotes.com/philosophy/descartes/section1.rhtml | 13 |
10 | Let us study fractions with denominator 10. Look at the following figure.
In the above figure, the blocks are 1 black, 2 green, 3 blue, 4 red.
So, the portion of each colour compared to the whole is black = 1⁄10; green = 2⁄10; blue = 3⁄10; red = 4⁄10;
black + red = 1⁄10; + 4⁄10; = 5⁄10; green + red = 2⁄10; + 4⁄10; = 6⁄... | http://www.math-help-ace.com/Decimals.html | 13 |
12 | Home | Writing | Reading | Social Studies | Math | Science
Before we get into the lessons, let's take a look at some important tips for taking the math section of the GED test.
As with all sections of the GED, remember to:
- Pace yourself
- Answer every question
- Eliminate answer choices whenever you can
And, above al... | http://www.gedforfree.com/free-ged-course/math/math-approach.html | 13 |
10 | Particles in the air (smoke, dust, soot, haze) are more dangerous to humans as the size of the particles decreases. Particles are produced by the combustion of fossil fuels (especially coal, but also oil and gasoline), and by burning garbage or hazardous waste. In July, 1987, the U.S. Environmental Protection Agency (E... | http://www.ejnet.org/rachel/rhwn134.htm | 13 |
52 | - How does Radio Echo Sounding Work?
- Frequencies and Wavelengths
- Radio Wave Propagation in Ice
- Field Work
- Data Processing
- Photos and Links
How Does Radio-Echo Sounding Work?
A radio-echo sounding system consists of two main
components: 1) the transmitter, and 2) the receiver. The
transmitter sends out a brief... | http://stolaf.edu/other/cegsic/background/index.htm | 13 |
14 | Listening Skills (Grade 9-12) The purpose of this activity is to increase the students' ability to listen and to understand what is being read and/or told to them.
Pictures: Following Oral Directions
Make Me a
Copy Please (Grade 5-6) Often times students are not able to communicate clearly what they would like to say. ... | http://www.theteachersguide.com/langarts.html | 13 |
12 | Seneferu was succeeded by his son Khufu, known to the Greeks as Cheops (pronounced Kee-ops), and he built the biggest pyramid of them all. It is 751 feet (229 m) at the base and originally stood 479 feet (146 m) high. Stone robbers have taken stones from the top, leaving it only 446 feet (136 m) high today. So many tou... | http://www.answersingenesis.org/articles/utp/khufu-built-the-big-one | 13 |
11 | at the Johns Hopkins University Applied Physics Laboratory
(APL), Laurel, Md.
designed and built a spacecraft called Near Earth Asteroid
Rendezvous (NEAR) Shoemaker. The spacecraft was sent into
orbit around an asteroid called 433 Eros.
spacecraft was launched Feb. 17, 1996, from Cape Canaveral,
Fla. It went into orbit... | http://www.jhuapl.edu/education/elementary/newspapercourse/storyscenarios/mission.htm | 13 |
26 | Just Ask Antoine!
Atoms & ions
Energy & change
The quantum theory
Electrons in atoms
The periodic table
- Use the
- Know the SI base units.
- State rough equivalents for the SI base units in the English system.
- Read and write the symbols for SI units.
- Recognize unit prefixes and their abbreviations.
- Build derived... | http://antoine.frostburg.edu/chem/senese/101/measurement/ | 13 |
53 | History of geodesy
Geodesy (/dʒiːˈɒdɨsi/), also named geodetics, is the scientific discipline that deals with the measurement and representation of the Earth.
Humanity has always been interested in the Earth. During very early times this interest was limited, naturally, to the immediate vicinity of home and residency, ... | http://en.wikipedia.org/wiki/History_of_geodesy | 13 |
17 | |Eq. 1: The variable on the left is known as the Greek letter Phi. It represents magnetic flux, measures in Webers or Wb, or Tesla*meter^2. B represents the magnetic field's magnitude. A is the area of the coil, such as for a circular loop of coil with radius r, the area would be pi*r^2.|
|Eq. 2: This is known as Farad... | http://physics.hivepc.com/eminduct.html | 13 |
32 | While it is difficult for students to observe asteroids directly, students of all ages can compare them to planets and to comets. Young students can compare scales of asteroids to that of the planets, and older students can compare composition, orbits and more!
There are also other activities that can be tied to this t... | http://solarsystem.nasa.gov/yss/display.cfm?Year=2011&Month=7&Tab=Classrooms | 13 |
11 | River deep, mountain high...
In this lecture period, we learn:
The Shape and Size of EarthA good way to look at a planet is by taking a globe in your hands. Because 3-dimensional objects are not convenient to carry around, early on in our traveling history the art of map making was invented. Maps of the earth offer 2-d... | http://www.globalchange.umich.edu/globalchange1/current/lectures/topography/topography.html | 13 |
15 | Synchrotron light is used today to carry out fundamental research in areas as diverse as condensed matter physics, pharmaceutical research and cultural heritage.
What is synchrotron light?
Synchrotron light (also known as synchrotron radiation) is electromagnetic radiation that is emitted when charged particles moving ... | http://www.iop.org/publications/iop/2011/page_47511.html | 13 |
31 | Math problems have a charm of their own. Besides, they help to develop a programmer's skill. Here, we describe a student's exam task: "Develop an application that models the behaviour of a Hypocycloid".
A cycloid is the curve defined by the path of a point on the edge of a circular wheel as the wheel rolls along a stra... | http://www.codeproject.com/Articles/48576/Hypocycloid | 13 |
13 | Deforestation is the logging or burning of trees in forested areas. There are several reasons for doing so: trees or derived charcoal can be sold as a commodity and are used by humans while cleared land is used as pasture, plantations of commodities and human settlement. The removal of trees without sufficient reforest... | http://everything.explained.at/Deforestation/ | 13 |
10 | Cruising far beyond the outermost planets, two American spacecraft have discovered the first strong physical evidence of the long-sought boundary marking the edge of the solar system, where the solar wind ebbs and the cold of interstellar space begins.
Voyager 1, now 4.9 billion miles out from Earth, began detecting in... | http://articles.mcall.com/1993-05-27/news/2915696_1_heliopause-interstellar-space-voyager-project | 13 |
12 | An Asymptote is actually a line whose distance with curve approaches zero as they approach infinity and this line (asymptote) never touches the curve. Line will always be close to curve but it will not intersect the curve.
Mainly there are three types of asymptotes:
1) Horizontal asymptotes,
2) Vertical asymptotes and
... | http://www.tutorcircle.com/graphing-oblique-asymptotes-fQVlq.html | 13 |
16 | Measurement: GED Test Prep (page 4)
The GED Mathematics Exam emphasizes real-life applications of math concepts, and this is especially true of questions about measurement. This article will review the basics of measurement systems used in the United States and other countries, performing mathematical operations with u... | http://www.education.com/reference/article/measurement4/?page=4 | 13 |
11 | - Read the instructions, texts and questions very carefully.
- Work through the parts of the paper in the order that suits you best.
- Read the sources, titles and subtitles of the texts where given; they are there to help you.
- Read each text carefully before you answer the questions to get an overall impression and ... | http://www.cambridgeenglish.org/exams-and-qualifications/proficiency/how-to-prepare/ | 13 |
20 | The MESH_MERGE function merges two polygonal meshes.
Result = MESH_MERGE (Verts, Conn, Verts1, Conn1 [, /COMBINE_VERTICES] [, TOLERANCE=value] )
The function return value is the number of triangles in the modified polygonal mesh connectivity array.
Input/Output array of polygonal vertices [3, n]. These are potentially ... | http://www.physics.nyu.edu/grierlab/idl_html_help/M27.html | 13 |
24 | Plotting Complex Numbers
Complex numbers may easily be plottedin the complex plane. Pure imaginaries are plotted along the vertical axis, the axis of imaginaries, and real numbers are plotted along the horizontal axis, the axis of reals. It follows that other points in the complex plane must represent numbers that are ... | http://www.tpub.com/math1/16c.htm | 13 |
13 | Manipulating files is an essential aspect of scripting in Python, and luckily for us, the process isn’t complicated. The built-in
open function is the preferred method for reading files of any type, and probably all you’ll ever need to use. Let’s first demonstrate how to use this method on a simple text file.
For clari... | http://pythoncentral.org/reading-and-writing-to-files-in-python/ | 13 |
95 | Over the years, NASA has collected a great deal of Earth science data from dozens of orbiting satellites. With time, these data collections have scattered among many archives that vary significantly in sophistication and access. NASA risked losing valuable, irreplaceable data as people retired, storage media decayed, f... | http://asis.org/Bulletin/Apr-95/schaefer.html | 13 |
84 | (An interactive version of this document is available in the "Related Links" section of this release.)
When Galileo used his homemade telescope 400 years ago to view mountains on the Moon, satellites circling Jupiter, and myriad stars in our Milky Way Galaxy, he launched a revolution that changed our view of an Earth-c... | http://www.hubblesite.org/newscenter/archive/releases/2007/16/background/ | 13 |
15 | Eukaryotic Organelles: The Cell Nucleus, Mitochondria, and Peroxisomes
We will now begin our discussion of intracellular organelles. As we have mentioned, only eukaryotic cells have intracellular sub-divisions, so our discussion will exclude prokaryotic cells. We will also focus on animal cells, since plant cells have ... | http://www.sparknotes.com/biology/cellstructure/intracellularcomponents/section2.rhtml | 13 |
51 | March 29, 2013
On the morning of July 16, 2010, a hunk of ice four times the size of Manhattan cracked away from the tongue of Greenland’s Petermann Glacier and drifted to sea as the largest iceberg since 1962. Just two years later, another massive section of ice calved from the same glacier. Icebergs like these don’t ... | http://blogs.smithsonianmag.com/science/tag/nasa/ | 13 |
13 | In the middle of the eighteenth century, Jews living in German territories were just beginning to feel the effects of the political, social and intellectual changes that would soon be recognized as the hallmarks of the modern world. Until this period, Jewish communities had been constituted as distinct and autonomous s... | http://jwa.org/encyclopedia/article/germany-1750-1945 | 13 |
16 | Special Relativity: Kinematics
Time Dilation and Length Contraction
The most important and famous results in Special Relativity are that of time dilation and length contraction. Here we will proceed by deriving time dilation and then deducing length contraction from it. It is important to note that we could do it the o... | http://www.sparknotes.com/physics/specialrelativity/kinematics/section2.rhtml | 13 |
15 | This chapter has been published in the book INDIA & Southeast Asia to 1800.
For ordering information, please click here.
In the Andhra land Satavahana king Simuka overthrew the last Kanva king in 30 BC and according to the Puranas reigned for 23 years. The Andhras were called Dasyus in the Aitareya Brahmana, and they w... | http://www.san.beck.org/AB2-India.html | 13 |
33 | In this activity, students become familiar with radio waves that are used to remotely sense the topography beneath the ice sheet. They experiment with travel time of waves and convert these to distance. The students, in groups, examine time data acquired along profiles of the Antarctic ice sheet and convert these data ... | http://tea.armadaproject.org/activity/tea_activity_shutey_res.html | 13 |
13 | Want to stay on top of all the space news? Follow @universetoday on Twitter
Some of the most frequently asked questions we get here at Universe Today and Astronomy Cast deal with black holes. Everyone wants to know what conditions would be like at the event horizon, or even inside a black hole. Answering those question... | http://www.universetoday.com/43110/could-a-black-hole-fit-in-your-computer-or-in-your-pocket/comment-page-5/ | 13 |
15 | Gamma radiation from black holes to diffuse gas in space heating, which delayed formation of dwarf galaxies.
The graph shows an extremely massive black hole surrounded by a dust ring (torus). The incidence of gas onto the black hole leads to a high-energy beam of matter and radiation, which can be transported over cosm... | http://scienceray.com/astronomy/black-holes-have-an-effect-on-how-entire-galaxies/ | 13 |
19 | January 1, 2005
The relaxing sound of a babbling brook; the happy laughter of a giggling child; the rousing sound of a marching band. All of these and more enrich our daily lives and are dependent on our ability to hear sound. But what exactly is sound and how is it that we are able to hear it? Keep reading to learn th... | http://arn.org/docs/glicksman/eyw_050101.htm | 13 |
45 | Ion propulsion, a futuristic technology that for decades catapulted spacecraft through the pages of science fiction novels is now a reality. A Glenn-designed ion engine, just 12 inches (30 centimeters) in diameter, is the main propulsion source for Deep Space 1 a 20th Century spacecraft now off on its primary mission t... | http://www.nasa.gov/centers/glenn/about/fs08grc.html | 13 |
13 | Aborigines were the first inhabitants of Australia, migrating there at least 40,000 years ago. While Asian explorers had landed in northern Australia well before AD 1500, it was not until the 17th century that the first Europeans from Holland managed to sail to Australia. Of the several Dutch expeditions into the south... | http://www-rohan.sdsu.edu/faculty/rwinslow/asia_pacific/australia.html | 13 |
22 | In geometric algebra, a blade is a generalization of the concept of scalars and vectors to include simple bivectors, trivectors, etc. Specifically, a k-blade is any object that can be expressed as the exterior product (informally wedge product) of k vectors, and is of grade k.
- A 0-blade is a scalar. The inner product... | http://en.wikipedia.org/wiki/Blade_(geometry) | 13 |
32 | 6.4. Number counts of faint galaxies
The final classical test I will discuss is that of number counts of distant objects - what radio astronomers call the log(N)-log(S) test. Basically one counts the number of galaxies N brighter than a certain flux limit S. If we lived in a static Euclidean universe, then the number o... | http://ned.ipac.caltech.edu/level5/Sept03/Sanders/Sanders6_4.html | 13 |
12 | A simple straight edge and a percentage circle offer children access to profound and fundamental learnings in both art and geometry. Making grids from scratch can exercise children's powers of visualization: the abilities developed through interpreting configurations for their 'hidden' geometric shapes, patterns, symme... | http://mathforum.org/sarah/shapiro/shapiro.inscribed.grids.html | 13 |
52 | Feathered dinosaurs is a term used to describe dinosaurs, particularly maniraptoran dromaeosaurs, that were covered in plumage; either filament-like intergumentary structures with few branches, to fully developed pennaceous feathers complete with shafts and vanes. Feathered dinosaurs first came to realization after it ... | http://fossil.wikia.com/wiki/Feathered_dinosaurs | 13 |
14 | August 15, 2012
How does one map the sky? It’s a daunting proposal to be sure and no Google cars or cameras are up to the task, but the team behind the Sloan Digital Sky Survey is making headway. The group, now in their third phase of research, recently released the largest ever 3-D map of the sky with some 540,000 gal... | http://blogs.smithsonianmag.com/aroundthemall/2012/08/largest-3-d-map-of-the-sky-released/ | 13 |
13 | We draw a triangle and the center of the circle passing through the three vertices of the triangle (the triangle's circumcenter). Profiting from Cabri-Geometric features, we drag the vertices, observing that in some instances the center of the circle lies on a triangle's side. Measuring, in such cases, the opposite ang... | http://mathforum.org/mathed/seville/recio/situation1.html | 13 |
10 | If you look at a cylindrical block from the bottom, you see a circle. If you look at it from the side you see a square.
Imagine a cylindrical block that is spinning around amazingly fast. When you look at it, it stops spinning and snaps into either a circle or a square.
This is similar to how a qubit will behave. Where... | http://thequantumlife.tumblr.com/tagged/Physics | 13 |
12 | How are black holes discovered?
How did the first astronomer discover the first black hole? Who had discovered it and when was it found? Please explain how the first black hole was discovered.
No single astronomer has the credit for discovering a black hole. Before I explain how astronomers found evidence for the exist... | http://curious.astro.cornell.edu/question.php?number=50 | 13 |
14 | John wants to know the values of the area and perimeter of a
rectangle. John can take measurements of the length and width of
the rectangle in inches. John's measurements are expected to be
accurate to within 0.1 inch.
1. Identify the inputs and outputs of the problem.
Inputs: length of rectangle, width of rectangle, n... | http://www.chegg.com/homework-help/questions-and-answers/john-wants-know-values-area-perimeter-rectangle-john-measurements-length-width-rectangle-i-q2504993 | 13 |
14 | The Basics of Pie Charts
A pie chart looks – you’ve guessed it – a bit like a pie. The chart is a circle with various-sized slices ‘cut out’ from the middle to the edge. The size of the slices shows the relative size of the categories. You often see a pie chart showing the results of an opinion poll.
Pie charts use ang... | http://www.dummies.com/how-to/content/the-basics-of-pie-charts.navId-407333.html | 13 |
10 | The upper limit on the mass of a neutron star is about 3 solar masses. Beyond that mass, the star can no longer support itself against its own gravity, and it must collapse. No known force can prevent the material from collapsing all the way to the point-like singularity, a region of extremely high density where the kn... | http://library.thinkquest.org/17445/universe/blackhole.shtml | 13 |
30 | Vector Addition: Force Table
The objective is to experimentally verify the parallelogram law of vector addition by using a force table.
A force table, a set of weights, a protractor, a metric ruler, a scientific calculator, and graphing paper
Concurrent forces are forces that pass through the same point. A resultant fo... | http://www.pstcc.edu/departments/natural_behavioral_sciences/Web%20Physics/Experiment%2003.htm | 13 |
19 | The Black Box
In 1859, scientist Robert Kirchhoff introduced an interesting problem into the world of physics: the question of blackbody radiation. A "blackbody" is basically a black box that absorbs all the radiation that is directed toward it. The amount of energy that it emits is independent of the size or shape of ... | http://www.sparknotes.com/biography/planck/section2.rhtml | 13 |
10 | Resurrecting mammoth evolutionary dead ends
Opinion:The film Jurassic Park featured dinosaurs cloned from DNA recovered from insects preserved in prehistoric amber. The scientific and technical capacity to do this remains a long way off, but, in the meantime, powerful biotechnological techniques are being applied to st... | http://www.irishtimes.com/news/science/resurrecting-mammoth-evolutionary-dead-ends-1.953723 | 13 |
21 | common name: terrestrial snails affecting plants in Florida
scientific name: phylum Mollusca, class Gastropoda
Molluscs are a very diverse group, with at least 85,000 species named, and estimates of up to 200,000 species occurring worldwide. They also inhabit nearly all ecosystems. The best known classes of molluscs ar... | http://entomology.ifas.ufl.edu/creatures/misc/gastro/terrestrial_snails.htm | 13 |
10 | Sep. 6, 2000 WEST LAFAYETTE, Ind. – Purdue University chemists have devised a way to remove a major obstacle in designing new materials for use in the atom-size realm of nanotechnology.
Nanoparticles – tailor made of selected metals or other materials and measuring just billionths of a meter in diameter – are the build... | http://www.sciencedaily.com/releases/2000/09/000904122310.htm | 13 |
22 | Ghostly galaxies in the distant universe are almost certainly the culprits behind a mysterious change in intergalactic gas that allows us to see across the cosmos. Although these galaxies are too faint to be spotted by current telescopes, future instruments could soon reveal their presence.
About 300,000 years after th... | http://www.newscientist.com/article/dn23063 | 13 |
17 | Squares and Triangles Game
- To review the concept of squares
- To experience the characteristics of shapes
- To identify triangles (2-D shapes)
- To compare and talk about shapes
Squares and triangles in different sizes and colors; a chalk or masking tape triangle on floor; triangles such as the musical instrument; Th... | http://school.familyeducation.com/preschool/activity/30578.html | 13 |
18 | See something needing your input? Click here to Join us in providing quality, expert-guided information to the public for free!
From Citizendium, the Citizens' Compendium
Transposons, also called "jumping genes", "mobile DNA" or "mobile genetic elements", are blocks of conserved DNA that can occasionally move to differ... | http://en.citizendium.org/wiki/Transposon | 13 |
12 | - Why should I bother learning this?
Much of the mathematics used every day is "relational" in nature -- that is, it is the relationship between the numbers which is of importance, not necessarily the numbers themselves. Some examples of these relationships are common in everyday happenings, such as the price of gasoli... | http://www.eduplace.com/math/mathsteps/6/a/6.proportions.ask.html | 13 |
12 | To use all functions of this page, please activate cookies in your browser.
With an accout for my.bionity.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
A plasmid is an extrachromosom... | http://www.bionity.com/en/encyclopedia/Plasmid.html | 13 |
30 | B1. Motion on prescribed trajectory
Inclined plane. Motion on an inclined plane. The inclined plane as a machine
When a mass is being raised, the direction of the motion (vertically upwards) and the direction of the load (weight, vertically downwards) are opposite, they form a stretched angle, a special one of all angl... | http://mpec.sc.mahidol.ac.th/radok/physmath/PHYSICS/B1.htm | 13 |
50 | Natural selection is one of the major mechanisms of evolution, but where most evolution textbooks discuss several such mechanisms, often devoting separate chapters to each, Explore Evolution ignores nearly all of them, devoting a chapter and a half to misrepresenting natural selection. The chapter devoted to this conce... | http://ncse.com/book/export/html/960 | 13 |
12 | To hammer home the theory you've just learnt let's look at a simple problem:
Given the digits 0 through 9 and the operators +, -, * and /, find a sequence that will represent a given target number. The operators will be applied sequentially from left to right as you read.
So, given the target number 23, the sequence 6+... | http://www.ai-junkie.com/ga/intro/gat3.html | 13 |
12 | How to Find the Derivative of a Line
The derivative is just a fancy calculus term for a simple idea that you probably know from algebra — slope. Slope is the fancy algebra term for steepness. And steepness is the fancy word for . . . No! Steepness is the ordinary word you’ve known since you were a kid, as in, Hey, this... | http://www.dummies.com/how-to/content/how-to-find-the-derivative-of-a-line.navId-403861.html | 13 |
12 | Teaching astronomy and space videos
The resources are built around a series of Teachers TV programmes, aim to support the teaching of astronomy and space to 11-16 year olds.
Produced with generous funding from the Science and Technology Facilities Council, on behalf of the Institute of Physics and Teachers TV, they are... | http://www.iop.org/resources/videos/education/classroom/astronomy/page_51897.html | 13 |
11 | To explain the rules for multiplication ofsigned numbers, we recall that multiplication of whole numbers may be thought of as shortened addition. Two types of multiplication problems must be examined; the first type involves number8 with unlike signs, and the second involves numbers with like signs.
Consider the exampl... | http://www.tpub.com/math1/4b.htm | 13 |
10 | We have provided a variety of resources to support and extend each chapter in the Level 5 Math Central textbook.
Chapter 1: Whole Numbers and Decimals
Chapter 2: Multiplication of Whole Numbers
Chapter 3: Division of Whole Numbers
Chapter 4: Collecting, Organizing, and Using Data
Chapter 5: Measurement and Geometry
Cha... | http://www.eduplace.com/math/mathcentral/grade5/index.html | 13 |
12 | Diagnosing a black hole flareMay 7th, 2012 in Space & Earth / Astronomy
An optical-IR image showing a galaxy that suddenly brightened when the supermassive black hole at its center shredded and absorbed a star that wandered too close. Credit: NASA; Gezari, Rest, and Chornock
(Phys.org) -- Black holes can come in a wide... | http://phys.org/print255599106.html | 13 |
78 | Given that there are thousands of asteroids and probably a hundred thousand million comets, these small bodies must be considered essential components of the solar system. Certainly objects closely similar to the small bodies that remain today were involved in the agglomeration of the larger planets and satellites some... | http://history.nasa.gov/SP-467/ch7.htm | 13 |
32 | Between 1900 and 1905, the Wright brothers designed and built three
unpowered gliders and three
As they designed each aircraft, how
did they know how big to make the wings?
The Wright brothers operated a bicycle shop in
Dayton, Ohio, and had a good working knowledge of math and science.
They knew about
of motion and ab... | http://wright.grc.nasa.gov/airplane/liftold.html | 13 |
10 | Observations of 1 Ceres, the largest known asteroid, have revealed that the object may be a "mini planet," and may contain large amounts of pure water ice beneath its surface.
The observations by NASA's Hubble Space Telescope also show that Ceres shares characteristics of the rocky, terrestrial planets like Earth. Cere... | http://www.hubblesite.org/newscenter/archive/releases/solar-system/2005/27/text/ | 13 |
69 | In many data analyses in social science, it is desirable to compute a coefficient of association. Coefficients of association are quantitative measures of the amount of relationship between two variables. Ultimately, most techniques can be reduced to a coefficient of association and expressed as the amount of relations... | http://jamesstacks.com/stat/pearson.htm | 13 |
19 | The possibility of life on Mars has held human interest for hundreds of years and has recently become an obsession for NASA.
A number of atmospheric probes and surface craft have been sent to Mars to assess the planet’s habitability. The ultimate goal is to send future missions to Mars to directly look for evidence of ... | http://www.reasons.org/articles/viking-invasion-of-mars-thwarted | 13 |
20 | Microwaves are radio waves with wavelengths ranging from as long as one meter to as short as one millimeter, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz. This broad definition includes both UHF and EHF (millimeter waves), and various sources use different boundaries. In all cases, microwave ... | http://www.digplanet.com/wiki/Microwave | 13 |
43 | From Math Images
|Gradients and Directional Derivatives|
|Change of Coordinate Systems|
|Math for Computer Graphics and Computer Vision|
Vectors are quantities that are specified by both a magnitude and direction. Perhaps the simplest vector is a Euclidean vector, represented by an arrow in Euclidean space. Refer to Im... | http://mathforum.org/mathimages/index.php/Vector | 13 |
21 | The inverse of the sine function is known as arc sine, most math libraries shorten this to asin
The inverse of the cosine function is known as arc cosine, most math libraries shorten this to acos
The inverse of the tangent function is known as arc tangent, most math libraries shorten this to atan or atan2
The trig func... | http://www.euclideanspace.com/maths/geometry/trig/inverse/index.htm | 13 |
11 | In this section we need to take a look at the velocity and
acceleration of a moving object.
From Calculus I we know that given the position function of
an object that the velocity of the object is the first derivative of the
position function and the acceleration of the object is the second derivative
of the position f... | http://tutorial.math.lamar.edu/Classes/CalcII/Velocity_Acceleration.aspx | 13 |
21 | Student Reasoning about Average
Average is a term which has common meanings such as "That's average" (meaning not very good), as well as mathematical meanings such as mean, mode and median. The news often reports average ambiguously where the use of mean, mode or median is not clear.
Learning Sequence on Average with t... | http://www.simerr.educ.utas.edu.au/numeracy/student_reasoning/average.htm | 13 |
10 | Teacher introduces the alphabet; fairy tales, folk tales and nature study; form drawing; reading approached through writing; addition, subtraction, multiplication, division; beginning foreign language, knitting, singing, and recorder.
Listening Skills. Given oral presentations of stories (primarily fairy tales and natu... | http://pineforestschool.org/the_grades/grade1/ | 13 |
19 | Information is not readily found at a bargain price. Gathering it is costly in terms of salaries, expenses and time. Taking samples of information can help ease these costs because it is often impractical to collect all the data. Sound conclusions can often be drawn from a relatively small amount of data; therefore, sa... | http://www.isixsigma.com/tools-templates/sampling-data/basic-sampling-strategies-sample-vs-population-data/ | 13 |
14 | Lesson: Electrons on the MoveContributed by: Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
Educational Standards :
Pre-Req Knowledge (Return to Contents)
atoms, electrons, electric charge
Learning Objectives (Return to Contents)
After this lesson, students should be... | http://www.teachengineering.org/view_lesson.php?url=collection/cub_/lessons/cub_electricity/cub_electricity_lesson03.xml&std_open=true | 13 |
11 | How to Subtract Vectors
You don’t come across vector subtraction very often in physics problems, but it does pop up. To subtract two vectors, you put their feet (or tails, the non-pointy parts) together; then draw the resultant vector, which is the difference of the two vectors, from the head of the vector you’re subtr... | http://www.dummies.com/how-to/content/how-to-subtract-vectors.html | 13 |
10 | As we discussed in pre-algebra, percent is a ratio that compares
a number to 100. Percent means per hundred. Percent is usually
expressed with the percent symbol %.
Percent problems are usually solved by using proportions.
In a classroom 14 of the 21 students are female. How many
percent does that correspond to?
We kno... | http://www.mathplanet.com/education/algebra-1/how-to-solve-linear-equations/calculating-with-percents | 13 |
52 | Washington, D.C.—The Moon has much more water than previously thought, a team of scientists led by Carnegie's Erik Hauri has discovered. Their research, published May 26 in ScienceExpress, shows that inclusions of magma trapped within crystals collected during the Apollo 17 mission contain 100 times more water than ear... | http://lunar-update.blogspot.com/2011_05_01_archive.html | 13 |
28 | Pre-lab Questions Experiment Post-lab Questions
EXPERIMENT 17: OXIDATION - REDUCTION
The following preparatory questions should be answered before coming to class. They are intended to introduce you to several ideas important to aspects of the experiment. You must turn-in your work to your teaching assistant before you... | http://intro.chem.okstate.edu/HTML/SEXP17.HTM | 13 |
65 | A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is ... | http://en.wikipedia.org/wiki/Screw_thread | 13 |
31 | These instructions are written in a simple format to explain how to find the diameter of a circle.
The diameter of a circle is 2 x the radius and is basically the span of two radii across the circle's center point thus forming a horizontal line across the entire circle like the example shows. The formula is expressed a... | http://www.monkeydoit.com/diameter-circle.php | 13 |
17 | Several years ago, NASA started making plans to send robots to explore the deep, dark craters on the Moon. As part of these plans, NASA needed modeling tools to help engineer unique electronics to withstand extremely cold temperatures.
According to Jonathan Pellish, a flight systems test engineer at Goddard Space Fligh... | http://spinoff.nasa.gov/Spinoff2012/it_3.html | 13 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.