CK-12 Foundation > Quotes

“kilometers, if”
― CK-12 Foundation, Physics - from Stargazers to Starships

“The DopplerEffect occurs when either the source of a wave or the observer of a wave (or both) are moving. When a source of a wave is moving towards you, the apparent frequency of the wave you detect is higher than that emitted. For instance, if a car approaches you while playing a note at 500 Hz, the sound you hear will be slightly higher. The opposite occurs (the frequency observed is lower than emitted) for a receding wave or if the observer moves away from the source. It’s important to note that the speed of the wave does not change –it’s traveling through the same medium so the speed is the same. Due to the relative motion between the source and the observer the frequency changes, but not the speed of the wave. Note that while the effect is similar for light and electromagnetic waves the formulas are not exactly the same as for sound.”
― CK-12 Foundation, CK-12 Basic Physics

“http://tinyurl.com/294stkw Explore the result of changing the population parameter,”
― CK-12 Foundation, CK-12 Advanced Probability and Statistics, Volume 1

“roots of a complex number, when graphed on the complex plane, are equally spaced around a circle. So, instead of having all the roots, all that is necessary to graph the roots is one of them and the radius of the circle. For this particular example, the roots are or apart (look in the root equation in the example, increased by ). This goes along with what we know about regular pentagons. The roots are degrees apart. Example 6: Calculate the three cube roots of 1 and represent them graphically. Solution: In standard form, and . The polar form is . The expression for determining the cube roots of is:”
― CK-12 Foundation, CK-12 Trigonometry

“The Fundamental Theorem of Algebra If is a polynomial of degree , then has at least one zero in the complex number domain. In other words, there is at least one complex number such that .”
― CK-12 Foundation, CK-12 Math Analysis

“Waves transfer energy over a distance without direct contact of the initial source. In this sense waves are phenomena not objects.”
― CK-12 Foundation, CK-12 Basic Physics

“Classifying”
― CK-12 Foundation, CK-12 Basic Geometry Volume 1 Of 2

“adaptive”
― CK-12 Foundation, CK-12 Basic Physics

“Your weight is simply the force of gravity on you, so pounds are just the English version of Newtons”
― CK-12 Foundation, CK-12 Basic Physics

“The only way to provide for our posterity is to do justly, to love mercy, and to walk humbly with our God. We must be knit together in this work as one man; we must take care of each other with brotherly affection. We shall be united in the bond of peace, the Lord will be our God and delight to dwell among us, so that we shall see much more of his wisdom, power, goodness and truth. We shall be as a City upon a Hill, the eyes of all people are upon us; so that if we shall [behave badly] and cause God to withdraw his help from us, we shall [invite] the mouths of enemies to speak evil of the ways of God, and cause their prayers to be turned into curses upon us. Therefore let us choose life, that we, and our [children], may live; by obeying his voice, for he is our life, and our prosperity .”
― CK-12 Foundation, U.S. History Sourcebook: Basic

“between Earth”
― CK-12 Foundation, CK-12 Middle School Math Grade 7, Volume 1 Of 2

“Subspecialty : Botany Studies : plants Subspecialty : Zoology Studies : animals Subspecialty : Marine biology Studies : organisms living in and around oceans, and seas Subspecialty : Fresh water biology Studies : organisms living in and around freshwater lakes, streams, rivers, ponds, etc. Subspecialty : Microbiology Studies : microorganisms Subspecialty : Bacteriology Studies : bacteria Subspecialty : Virology Studies : viruses ( see Figure below ) Subspecialty : Entomology Studies : insects Subspecialty : Taxonomy Studies : the classification of organisms Subspecialty : Studies : Life Science : Cell biology What it Examines : cells and their structures (see Figure below ) Life Science : Anatomy What it Examines : the structures of animals Life Science : Morphology What it Examines : the form and structure of living organisms Life Science : Physiology What it Examines : the physical and chemical functions of tissues and organs Life Science : Immunology What it Examines : the mechanisms inside organisms that protect them from disease and infection Life Science : Neuroscience What it Examines : the nervous system Life Science : Developmental biology and embryology What it Examines : the growth and development of plants and animals Life Science : Genetics What it Examines : the genetic make up of all living organisms (heredity) Life Science : Biochemistry What it Examines : the chemistry of living organisms Life Science : Molecular biology What it Examines : biology at the molecular level Life Science : Epidemiology What it Examines : how diseases arise and spread Life Science : What it Examines : Life Science : Ecology What it Examines : how various organisms interact with their environments Life Science : Biogeography What it Examines : the distribution of living organisms (see Figure below ) Life Science : Population biology What it Examines : the biodiversity, evolution, and environmental biology of populations of organisms Life Science : What it Examines :”
― CK-12 Foundation, CK-12 Life Science for Middle School