Extractions: Topic: Development and Consumption of Energy change topic change subject Determining final velocity using initial velocity and displacements in a ramp question. A 5 kg bowling ball is rolled back to the bowler over a ramp system. If the ball is given an initial velocity of 0.6 m/s at its starting points height which is 100 cm, what is the balls velocity at its ending point at 40 cm, after going over a height of 45cm first? So the ball leaves the first position goes through a dip up to 45 cm and ends at 40 cm. Download a solution to this problem.
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Extractions: American Revolution Colonial America Colonial Life Jamestown Middle Colonies New England Colonies ... World History Links Search...KID INFO Linda Guterba, (email: email@example.com) Learn More about: KID INFO, TEACHER TIDBYTES, and the WEB SITE AUTHOR THANK YOU, Cboss, for believing in KID INFO! Visit the Cboss site
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Extractions: (these sites are not maintained by kids.gov *) Air Force Crossroads - Hope you came ready to have fun because this section has tons to offer both kids and teenagers alike. From sports to arts to video games, you will find hours worth of information and entertainment that will keep you coming back for more. American Memory - Visit the digital library and learn all about American history and culture. Ask Joan of Art - Do you have a question about American art and don't know how to find the answer? Art information specialists at the Smithsonian American Art Museum, using print and electronic reference sources, will help you get started. Ben's Guide to US Government for Kids - This site provides learning tools for K-12 students, parents, and teachers. These resources will teach how our government works, and much more. Create a Graph - Try your hand at creating some and see if it helps explain what you are trying to show. Try using homework problems, things you have a special interest in, or just make up some numbers of your own!
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Extractions: Below you will find actual postings from the BrainMass Solution Library. These postings and responses can be downloaded for as little as $0.20 each from inside your BrainMass Student Account. Get instant homework help by creating a Student Account, Click here Subject: Mechanical and Materials Engineering Topic: Energy Conversion change topic change subject barrage energy example a) Calculate the volume of water that is available for power generation at the extremes of spring and nap tides? b) If during the time the turbines are running, the level of the water in the bay is 2m higher that that in the sea, what is the potential energy available from the scheme? c) Assuming the turbines and associated machinery have an overall efficiency of 30% and the average bulk price for electricity is 2p/kWh, what annual income is available? (we can assume that the height of the tides varies evenly between neap and spring levels) d) If investors are looking for a 15% return on capital employed, what is the maximum cost of the 17km barrage if it is to be privately financed and paid for by sales of electricity? e) Can you estimate the ratings of the generators, transformers, cables, etc (what assumptions do you have to make?) f) Was a 2m height difference the best choice? If no, what is, and why? Download a solution to this problem.
Extractions: http://www.wri.org/wri/enved/poptrends.html Graphs and maps illustrate some of the major conditions and trends in population, agriculture, biodiversity, forests, water resources, energy, climate, and social and economic development that determine the state of the world's environment. These data give a broad picture of trends over 20 years.
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Homework Center - Physical Sciences Multnomah County Library homework Center. about energy conservation, kinetic, and potential energy; properties of Great detailed images to help explain concepts http://www.multcolib.org/homework/physcihc.html
Extractions: PHYSICS HELP PHYSICS homework help Science fair project ideas Science Fair projects useful links for physics help for school students Physics Links Links to sites about Physics Treasure Trove of Physics - On-line encyclopedia of physics terms and formulas. Full searchable, and also browsable alphabetically and by topic. Matter / Mass / Atoms / and Molecules LOTS of links to information sites about matter, mass, atoms, and molecules All About Atoms: A slide show which gives facts and information about atoms A Look Inside the Atom: A history; facts, information, diagrams, photographs Energy Core Page: A site dedicated to energy; facts and information about energy, the history of energy, bio-mass energy, chemical energy, electrical energy, food energy, hydro-electrical energy, natural gas, nuclear energy, oil energy, and wind energy, as well as careers dealing with energy Energy Education from the California Energy Commission Energy science projects for all levels of skill; Puzzles and games for various age levels (Difficulty level: Easy to Hard); Ben Franklin Explains Energy in 1740 and Today; A gallery of pictures and biographies of energy pioneers.(Difficulty level: Easy to Medium); The "only" Internet Energy Game Show (Difficulty level: Easy to Hard); Facts and information about Fossil Fuels, Geothermal Energy, Hydroelectric Energy, Nuclear Energy, Solar Energy, Wind Energy, and more
GEOGRAPHY HOMEWORK HELP GEOGRAPHY SITES Terrarum Find information on climate, the earth, energy, land, the sky, and water. AVHRR images; Encyclopedia of the Atmospheric Environment; homework help. http://www.indianchild.com/geography_help.htm
Extractions: Geography Encyclopedia An excellent geography encyclopedia for students of all ages, Search thousands of articles, maps, pictures, flags, and videos filled with updated information on the countries, lakes, cities, and rivers of the world. Earth Resources - explore the dynamic environment created by wetlands, volcanoes, and earthquakes etc. Way with Map and Compass - About using topographic maps and a compass Thesaurus of Geographic Names - search any place in the world and find out where it is on Earth. Includes ancient place names, current names. scenery pictures winter scenery christmas scenery tornado pictures ... Famous World Landmarks Photographs of famous landmarks http://school.discovery.com/homeworkhelp/worldbook/atozgeography/ - Excellent source of Geography information. Geography pages, printouts, and activities for students
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Extractions: Homework Help Week of 05/18 Week of 05/11 Week of 05/04 Week of 01/05 ... Week of 10/27 Ask Dr. Math B.J. Pinchbeck's Homework Helper This Week's Top Eight Internet Homework Research Links (05/18): http://www.biology.arizona.edu/cell_bio/cell_bio.html History of Native Americans in West Virginia http://www.wvlc.wvnet.edu/history/indians.html BBC News about Science http://news.bbc.co.uk/hi/english/sci/tech/ The latest news and a generous archive of recent articles make thisan ideal place to keep up with the sciences and to find ideas and reference for homework essays. By visiting this Website once a week, a class could keep abreast of scientific breakthroughs, as they are reported by writers at the British Broadcasting Company. Inquiry into topics of the articles is supported further by access to relevant earlier BBC stories, and to germane Internet links. Placed on the Web from the resources of the lion of British broadcast, the writing is wonderful and illustrations are superior and plentiful. Citing Online Sources http://clever.net/quinion/words/citation.htm
Extractions: Q - Angle between F and S Work will be zero if F or S = or angle Q = 90 o In the current situation the wall is not moving and S is therefore zero. It follows that Work is zero, that is no work is done. A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds at 20 m/s. Find the change in momentum of the ball as a result of the collision with the side walk (in kg m/s). Mass of the rubber ball = 0.2 kg = m Initial velocity = 30 m/s = v Final velocity after collision = -20m/s = v Change in momentum = mv - mv = m(v - v = 10 kg m /s Q. A 2.0 kg block is thrown upward from a point 20m above Earth's surface. At what height above Earth's surface will the gravitational potential energy of the Earth block system have increased by 500J? Ans.
Extractions: homework help math, chem help? click Home Ask Questions Latest Answers ... Properties of Matter "FORMULATOR" SPEEDS UP HOMEWORK Formula: F = m x a FORCE: N MASS: kg ACCELERATION: m/s Physics Formula Calculator from http://tutor4physics.com Q. A120 lb person is being lifted aloft by a rocket which accelerates uniformly to an upward speed of 300 ft/sec in 2 sec. a) What is the upward acceleration in multiples of g? Mass of the man = 120lb Final speed of the rocket = 300 ft/sec Time = 2 sec Acceleration of the rocket can be calculated from first equation of motion v = u + at 300 = + a x 2 a = 150 ft/sec b) What is the apparent weight of the person during acceleration? Free body diagram: N - Normal reaction which is equal to the apparent weight of the man. mg - Actual weight of the man ma = N - mg N = ma + mg = m (a + g) = m (4.7g + g) = 5.7mg = 5.7 x 120 g = 684g = 684 lbf. Q. A short 10 gram string is used to pull a 50 gram toy across a frictionless horizontal surface. If a 3.0 x 10 Newton force is applied horizontally to the free end. Find the force of the string on the toy, at the other end. Mass of the string = 10 grams = 10 kg Mass of the toy = 50 gm = 5 x 10 kg Mass of toy + string = 10 + 5 x 10 = 6 x 10 kg Force applied F = 3.0 x 10 N
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Extractions: Sites providing an introduction to several basic science concepts. Annotated lists of sites are available for atoms and molecules, DNA and genes, electromagnetic radiation, energy, the immune system, the solar system, the structure of the earth and weather and climate. From the Australian Academy of Science. Beyond Discovery: The Path to from Research to Human Benefit A series of articles in agriculture, biology, chemistry, earth sciences, environmental issues, health, mathematics, physics and technology that trace the origins of important recent technological and medical advances. Each story reveals the crucial role played by basic science, the applications of which could not have been anticipated at the time the original research was conducted. From the National Academy of Sciences.
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Extractions: by Emily McPherson LASER stands for Light Amplification by the Stimulated Emission of Radiation. In 1917 Albert Einstein calculated the conditions necessary for stimulated emission; but, it was only much later, in 1960, that the first visible LASER was demonstrated by T. Maiman. However, a MASER, a similar device that emitted energy in the microwave region was the first to be developed. Basic Concepts Normally when an electron gains energy there is a random time delay before it spontaneously emits the energy as light. Sometimes this emission is said to come from a 'forbidden transition' and the time delay is much longer, though still random. This is called Spontaneous emission. If during this waiting period the electron is hit by a photon of light the electron will instantly emit its energy. This is called Stimulated emission. An unusual feature of this is that the photon emitted will be traveling in the same direction as the original photon. For this process to be sustained the rate of stimulated emission needs to be greater than that of spontaneous emission. This state is called a Population Inversion, where there are more excited electrons than unexcited electrons. However, with just two energy state involved this will never be achieved. Three or four energy levels are generally used.
Extractions: Tuesday, June 8, 2004 Homework Help Forum Homework Help Experts The Pros and Cons of Nuclear Energy Pros - 1. Little Pollution 2. Reliability Nuclear power plants need little fuel, so they are less vulnerable to shortages because of strikes or natural disasters. International relations will have little effect on the supply of fuel to the reactors because uranium is evenly deposited around the globe. One disadvantage of uranium mining is that it leaves the residues from chemical processing of the ore, which leads to radon exposure to the public. These effects do not outweigh the benefits by the fact that mining uranium out of the ground reduces future radon exposures. Coal burning leaves ashes that will increase future radon exposures. The estimates of radon show that it is safer to use nuclear fuel than burn coal. Mining of the fuel required to operate a nuclear plant for one year will avert a few hundred deaths, while the ashes from a coal-burning plant will cause 30 deaths. 3. Safety Cons - 1. Meltdowns 2. Radiation