...Lithonia, GA Campus Physical Sience - Professor Freeman July 19, 2012 Discuss how energy can be converted from one form to another, giving specific examples. Today there are many different forms of energy and they all have the ability to transform produce change and to do work. How energy is converted from to another is based on the law of conservation of energy. “The law of conservation of energy is that energy cannot be created or destroyed, but it can be transferred or transformed from one form to another including transformation into or from mass, as matter.” Examples of energy are those that follow: Mechanical energy stored or moving energy also referred to as potential or kinetic energy, electrical energy the movement of electrons, thermal energy heat of an object, and radiant energy light and warmth of the sun are all energies that can be converted to another form of energy. For example, the chemical energy stored in the muscles of our legs is converted to kinetic energy or mechanical energy when we pedal, a toaster oven plugged into an electrical socket takes electrical energy and converts it to heat/thermal energy, and radiant energy converted to heat energy provided by the sun that heats earth. Define what we mean by fossil fuels and explain why there are attractive sources of energy. Fossil fuels are also natural resources of energy that is a product of millions of years of decomposed plant and animal pressured by heat trapped underground...
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...LESSON 1: History of Electronics The introduction of vacuum tubes at the beginning of the 20th century was the starting point of the rapid growth of modern electronics. With the vacuum tubes the manipulation signals became possible, which could not be done with the early telegraph and telephone circuit or with the early transmitters using high voltage sparks to create radio waves. Example: weak radio and audio signals can be amplified, audio signals such as music or voice can be superimposed radio waves. The development of a large variety of tubes designed for specialized functions made possible the swift progress of radio communication technology before World War II and the development of early computers during and shortly after the war. The transistor invented in 1948, has now completely replaced the vacuum tubes in most of its application. Incorporating an arrangement of semiconductor materials and electrical contacts, the transistor provides the same functions at reduced cost, weight and power consumption and with higher reliability. Subsequent advances in semiconductor technology, in part attributable to the intensity of research associated with the space exploration effort led to the development of the integrated circuit. Integrated circuits may contain hundreds of thousands of transistors on small piece of material and allow the construction of complex electronic circuits, such as those in microcomputers, audio, and video equipment and communication satellites. ...
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...What is the form of energy that is present in pizza that we eat? A) Mechanical B) Chemical C) Radiation D) Electrical Which of the following is not a unit of energy? A) Joules B) Meters C) BTU D) Calories What is the energy stored in the bonds that hold molecules together called? A) Chemical B) Kinetic C) Nuclear D) Thermal Which of the following is the process of breaking a large nuclei into two intermediate size nuclei? A) Chemical reaction B) Nuclear fusion C) Nuclear fission D) All of the above A woman moves a box through a distance of 10 m. What is the work done if the force applied is 10N? A) 100 J B) 50 J C) 0 J D) None of the above How many calories is 1 food calorie equivalent to? A) 1,000,000 B) 100 C) 1000 D) 10,000 What property of a small meteor falling from the sky causes a lot of damage when it hits the earth? A) High Kinetic energy B) High heat energy C) High Potential energy D) Explosive Chemical energy What happens to its temperature when a gas is compressed? A) can either increase or decrease B) decreases C) remains the same D) increases Energy possessed by a body due to its motion is called A) Thermal B) Kinetic C) Potential D) Chemical Energy can be created or destroyed. A) True B) False Correct answer(s): False In what direction does thermal energy flow? A) independent of the temperature difference B) From low temperature to high temperature C) From high temperature to low temperature D) in both directions What is the form of energy in a flying airplane...
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...Chapter 2 ENERGY CONVERSION AND GENERAL ENERGY ANALYSIS W hether we realize it or not, energy is an important part of most aspects of daily life. The quality of life, and even its sustenance, depends on the availability of energy. Therefore, it is important to have a good understanding of the sources of energy, the conversion of energy from one form to another, and the ramifications of these conversions. Energy exists in numerous forms such as thermal, mechanical, electric, chemical, and nuclear. Even mass can be considered a form of energy. Energy can be transferred to or from a closed system (a fixed mass) in two distinct forms: heat and work. For control volumes, energy can also be transferred by mass flow. An energy transfer to or from a closed system is heat if it is caused by a temperature difference. Otherwise it is work, and it is caused by a force acting through a distance. We start this chapter with a discussion of various forms of energy and energy transfer by heat. We then introduce various forms of work and discuss energy transfer by work. We continue with developing a general intuitive expression for the first law of thermodynamics, also known as the conservation of energy principle, which is one of the most fundamental principles in nature, and we then demonstrate its use. Finally, we discuss the efficiencies of some familiar energy conversion processes, and examine the impact on energy conversion on the environment. Detailed treatments...
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.... . . . . . . . . . . . . . . . . . . . . .13 Chapter 5: Matter—Properties and Changes . . . . . . . . . . . . . . .17 Chapter 6: Atomic Structure and Chemical Bonds. . . . . . . . . . .21 Chapter 7: Chemical Reactions. . . . . . . . . . . . . . . . . . . . . . . . .23 Chapter 8: Substances, Mixtures, and Solubility . . . . . . . . . . . .25 Chapter 9: Carbon Chemistry . . . . . . . . . . . . . . . . . . . . . . . . .29 Chapter 10: Motion and Momentum . . . . . . . . . . . . . . . . . . . .33 Chapter 11: Force and Newton’s Laws . . . . . . . . . . . . . . . . . . .37 Chapter 12: Forces and Fluids . . . . . . . . . . . . . . . . . . . . . . . . .41 Chapter 13: Energy and Energy Resources . . . . . . . . . . . . . . . .45 Chapter 14: Work and Simple Machines . . . . . . . . . . . . . . . . . .49 Chapter 15: Thermal Energy . . . . . . . . . . . . . . . . . . . . . . . . . .53 Chapter 16: Waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 Chapter 17: Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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...Our group chose to research Hydropower in the tidewater region of North Carolina. Throughout our research we have learned how it works and how much can be produced to support the whole country. We also learned about some advantages, disadvantages, the environmental and physical costs of using this energy source. Throughout our paper you’ll see that this source of energy is the most efficient and reliable source for North Carolina. Hydro power works based off of water flows in rivers, dams, facilities, and even the ocean. There are reservoirs set up for this purpose; for example The Hoover Dam. On average is produces 4 billion kilowatt-hours of electricity, that’s enough for 1.3 million people. Hydropower uses technologies that are specifically...
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...Unit 1 Revision (higher tier) Energy There are 9 different forms of energy: Light Heat Chemical Kinetic (movement) Electrical Elastic (Gravitational) potential Nuclear Sound Energy is never created or destroyed! Energy is transferred from one form to another form. Not all of the energy transferred by a device is useful energy. Potential energy is stored energy. All energy will eventually spread out to the surroundings as heat. Sample question 1 Sankey diagrams and efficiency Sample sankey diagram for a light bulb Sankey diagrams are ways of representing the different energy transformations that take place in different electrical devices. The start of the sankey diagram shows the total energy going into the device. The diagram then splits off into different sized arrows to represent the other energy transfers that take place, the bigger the arrow the larger the energy. The energy entering the device must equal the energy leaving the device. To know how good a device is at transferring energy you need to be able to calculate the efficiency. To do that you need to use the following equation (which will be given in the exam) OR So for the above example the answer would be Efficiency= 10100=0.1 The closer the efficiency is to 1 the more useful energy the device is transferring. So for the light bulb example we got an efficiency of 0.1, so the light bulb isn’t very good and transferring useful energy. Sample question 2 Kinetic...
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...reserch report Solar Energy Solar energy is a perfect source of energy. Energy with no pollution what so ever. No poisonous gasses or destruction of rainforests. This never ending source of energy comes from the sun. Solar energy is the visible energy produced in the sun as a result of a constant nuclear fusion reaction. The amount of energy at the solar constant, which is at outer edge of the earth's atmosphere, is two calories per minute per cm squared. A calorieis the amount of energy needed to raise one gram of water one degree Celsius.If we could efficiently harness the energy bombarding the earth for twenty-four hours we could power New York for a year. Unfortunately the photovoltaic cells that change the energy into electricity are so inefficient that it would take twenty-five years to pay for it's self in output. There many uses of solar energy. Some homes rely fully on the power of the sun to heat their water. Other houses have flat plate collectors which aid in the heating of the house and water. Solar Energy plays a vital role in the absorption cooling cycle in a process called solar cooling. Since wind is caused by the up and down movement of hot and cold air, wind energy can be a branch of solar energy. The same thing with tidal energy. And since the sun plays a vital role in the water cycle hydroelectric energy can be attributed to solar energy. Solar Energy has great potential in becoming a main source of energy in the...
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...Logan Walls Dr. Cohenour 9/24/2012 The Cost of Mother Nature West Virginia has a number of different natural energy resources that can be utilized. There is coal, which is a nonrenewable energy resource because there is a limited amount of supply. Then there is wind and hydropower, which are considered renewable energy resources; because there is an infinite amount of supply. The city council may want to take into consideration these two renewable energy sources for the many different advantages each source has to offer. West Virginia has an abundance of natural energy resources such as coal, wind, and hydropower; all of these energy resources could generate electricity and stabilize the community’s economy in various ways, including the different types of facilities, cost, and production output. West Virginia coalmines are amongst the top in the country for coal production. A 2009 study showed that five states in America produced close to three quarters of all the coal in the entire country, and West Virginia was number two on the list. Coal is used to generate electricity, heat, and for industrial uses. In the 2009 study, over ninety percent of the coal was used to generate electricity, a little over six percent was used in the industry, and less than one percent was used to generate heat (“Coal” 18). West Virginia mines a large portion of the countries coal every year and in order to keep up the high demand, most of the state workforce is employed by the coalmines...
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...systems 1. Isolated system * Boundary prevents the system from exchanging BOTH matter & energy with its surroundings. * Both matter and energy within the system are fixed & finite because none can enter and none can leave the system. * Imaginary – impossible for any real boundary to be so perfectly insulated that energy can neither enter or escape. 2. Closed system * Boundary permits the exchange of energy, but not matter within its surroundings * Matter within the system is finite but energy is exchangeable in and out of the system 3. Open system * Boundary permits exchange of both energy and matter * Ie. Island. * Open systems are more difficult to study because they have more potential for uncontrolled variation Box model * A model is a representation of something. * A box model can show the essential features of a system. i. The process by which matter enters & leaves the system and the rates at which they do so ii. The process which matter moves among the various parts of the system internally & the rates at which this happens iii. The amount of matter (or energy) in the system at a given time and its distribution within the system * The amount of matter (or energy) that is transferred along & the rate that is being transferred is called a flux * Places where energy or matter is stored for a period of time is called a reservoir ie water stored in the atmosphere ; water...
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...*Physics Prelims (1-7).qxd 12/11/08 1:00 PM Page 1 SCIENCE VISUAL RESOURCES PHYSICS An Illustrated Guide to Science The Diagram Group *Physics Prelims (1-7).qxd 12/11/08 1:00 PM Page 2 Physics: An Illustrated Guide to Science Copyright © 2006 The Diagram Group Author: Derek McMonagle BSc PhD CSci CChem FRSC Editors: Catherine Gaunt, Jamie Stokes Design: Anthony Atherton, Richard Hummerstone, Lee Lawrence, Tim Noel-Johnson, Phil Richardson Illustration: Peter Wilkinson Picture research: Neil McKenna Indexer: Martin Hargreaves All rights reserved. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval systems, without permission in writing from the publisher. For information contact: Chelsea House An imprint of Infobase Publishing 132 West 31st Street New York NY 10001 For Library of Congress Cataloging-in-Publication Data, please contact the Publisher ISBN 0-8160-6167-X Chelsea House books are available at special discounts when purchased in bulk quantities for businesses, associations, institutions, or sales promotions. Please call our Special Sales Department in New York at 212/967-8800 or 800/322-8755. You can find Chelsea House on the World Wide Web at http://www.chelseahouse.com Printed in China CP Diagram 10 9 8 7 6 5 4 3 2 This book is printed on acid-free paper. *Physics Prelims (1-7).qxd 12/11/08 1:00 PM Page...
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...energy from sun: energy radiated from the Sun in the form of heat and light, used by green plants for photosynthesis and harnessed as solar power 2. energy from Sun: energy obtained from radiation emitted by the Sun Translations Home » Wind Energy Guide » Wind Energy Basics Wind Energy Basics Basic information on wind energy and wind power technology, resources, and issues of concern. Wind Energy and Wind Power Wind is a form of solar energy. Winds are caused by the uneven heating of the atmosphere by the sun, the irregularities of the earth's surface, and rotation of the earth. Wind flow patterns are modified by the earth's terrain, bodies of water, and vegetative cover. This wind flow, or motion energy, when "harvested" by modern wind turbines, can be used to generate electricity. How Wind Power Is Generated The terms "wind energy" or "wind power" describe the process by which the wind is used to generate mechanical power or electricity. Wind turbines convert the kinetic energy in the wind into mechanical power. This mechanical power can be used for specific tasks (such as grinding grain or pumping water) or a generator can convert this mechanical power into electricity to power homes, businesses, schools, and the like. Wind Turbines Wind turbines, like aircraft propeller blades, turn in the moving air and power an electric generator that supplies an electric current. Simply stated, a wind turbine is the opposite of a fan. Instead of using electricity...
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...be used to generate electricity from the elevated water in the basin. Some researchers are also trying to extract energy directly from tidal flow streams. The energy potential of tidal basins is large — the largest facility, the La Rance station in France, generates 240 megawatts of power. Currently, France is the only country that successfully uses this power source. French engineers have noted that if the use of tidal power on a global level was brought to high enough levels, the Earth would slow its rotation by 24 hours every 2,000 years. Tidal energy systems can have environmental impacts on tidal basins because of reduced tidal flow and silt buildup. 3 Ways of Using the Tidal Power of the Ocean There are three basic ways to tap the ocean for its energy. We can use the ocean's waves, we can use the ocean's high and low tides, or we can use temperature differences in the water. 1 Wave Energy Kinetic energy (movement) exists in the moving waves of the ocean. That energy can be used to power a turbine. In this simple example, (illustrated to the right) the wave rises into a chamber. The rising water forces the air out of the chamber. The moving air spins a turbine which can turn a generator. When the wave goes down, air flows through the turbine and back into the chamber through doors that are normally closed. This is only one type of wave-energy system. Others actually use the up and down motion of the wave to power a piston that moves up and down inside a...
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...Alqarni, Abdullah Homework Assignment # 8 Geology 1, Section # 1176 or 1177 (pick one) Dr. Beraki Woldehaimanot Date (assignment completed) QUESTIONS GEOLOGIC TIME 1. Distinguish between numerical (radioactive) dates and relative dates. numerical specify the actual number of years that have passed since an event occurred; relative means placing rocks in their property sequences of formation 2. Refer to the geologic cross section accompanying question 10 on page 333 (your textbook). Your task is to place the lettered features in the proper sequence, from oldest to youngest. 3. Would you expect to find fossils of humans and Dinosaurs in the same rock? Explain. No. 4. Define half-life. Half-life is defined as the time it takes for one half of a radioactive element to decay into a daughter isotope. 5. Answer question 6 from page 332 in your textbook (section: Give It Some Though). 6. Answer question 10 from page 333 in your textbook (section: Give It Some Though).(same as # 2) RUNNING WATER & GROUNDWATER 7. Over the oceans, evaporation exceeds precipitation, yet sea level does not drop. Explain why. Most precipitation originates by evaporation from the oceans. Over time, water evaporated from the oceans is replenished by inflow of freshwater from rivers and streams. Continental ice sheets and glaciers have a strong effect on sea level changes. Expanding glacial ice volumes result in lowered sea level, shrinking ice sheets and glaciers...
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...Renewable Energy Sources The Sustainability Revolution John C. Ayers "In a sense, the fossil fuels are a one-time gift that lifted us up from subsistence agriculture and should eventually lead us to a future based on renewable resources." Kenneth Deffeyes (2001) "I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that." — Thomas Edison, 1931 We cannot create or destroy energy. We can only capture it. The sun provides either directly or indirectly nearly all of the energy available to us. Plants capture solar energy directly through photosynthesis. Fossil fuels contain the energy of sunlight captured hundreds of millions of years ago. Photovoltaic (PV) cells also capture sunlight energy directly. Other energy sources capture the energy of sunlight indirectly. Heat from the sun powers the flowing air and water. We usually capture the kinetic energy of wind and water by using turbines that transfer the energy to an alternator, an electrical generator that produces alternating current. Geothermal energy is different in that it captures flowing heat energy produced by radioactive decay in the earth’s interior. In this chapter we will see that Wind, Water, and Sun (WWS) energy sources are sustainable because they are renewable, clean, safe, and nearly carbon-free. Although they have low energy densities, meaning that they require large areas of land or water to produce energy, they are...
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