...Relationship among Force, Power, Work and Energy Force, work, energy and power are words used frequently in our everyday lives. What exactly do they mean? To put it simply, force is that which causes an object to move, while work is done when that force causes movement. Energy is the inherent ability of any object to do work, while power is the rate at which that work is done. Law of Conservation of Mechanical Energy Mechanical energy is stored in an object due to virtue of its motion. Potential energy and kinetic energy are the two types of mechanical energy, and the law of conservation of mechanical energy is associated with the conservation of these two energies in a system. Mechanical energy is basically a combination of potential and kinetic energy. Principle of Conservation of Mechanical Energy According to the law of conservation of mechanical energy, in an isolated system, that is, in the absence of non-conservative forces like friction, the initial total energy of the system equals to the total energy of the system. Simply stated, the total mechanical energy of a system is always constant (in case of absence of non-conservative forces). For instance, if a ball is rolled down a frictionless roller coaster, the initial and final energies remain constant. Conservative forces are those that don't depend on the path taken by an object. For example, gravity, spring and electrical forces are examples of mechanical energy. Conservation of Mechanical Energy Equation The...
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...“Different causes of car accident in community” the sleepy community it was in the past, and the density of the population has led to many serious traffic problems throughout the city. The numbers of auto accidents continue to rise, and these accidents involve a range of negligent driving behaviours. • People who are sleepy while driving is one of example og car accident there are road conditions that are dangerous even in the dry months, often leading to serious or deadly accidents. In car accident there are 3 main accident reasons behind these auto crashes: speed, impaired driving and distractions. •in weather condition while driving too fast is dangerous. Although heavy rains make it unsafe to travel at normal speeds, some drivers just won’t slow down. •Using cell phone while driving is well known to be dangerous, and texting while driving puts the driver, the passengers and all travellers on the road at great risk of harm. The driver’s eyes are not on the road ahead; instead he or she is mentally focused on reading an incoming text or email, or in composing the text or email. While the attention of the driver is shifted off the road and onto the digital device, the vehicle travels a great distance, and the potential for hitting a car ahead, swerving out of lanes and into oncoming traffic and other dangers is very real. Other driver distractions include daydreaming, talking on the phone. •when they get behind the wheel. A normally friendly individual can have a complete...
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...Isaac Newton was born on January 4, 1643, Woolsthorpe, England. He was an English Mathematician, Physician, and Scientist that lead to the most influential scientist of all time. Newton is an influential person for physics because he gave ideas of motion that later on become the famous Newton's 3 Law of Motion, that we know today. The first newton law of motion, also known as the law of inertia, states that if an object is at rest then it will remain at rest unless is acted on by an unbalanced force. In other words, if an object is in motion and there's no net forcing acting upon that object, then the object will maintain a constant velocity. Now if the object is at rest it will maintain to be on rest unless there's an external force applied....
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...mathematician and physicist and created several important inventions. Among his many great accomplishments, three significant things that made him well known were his laws of motion, his work in calculus, and his book on physics. The first of his 3 great achievements was his laws of motion. These consist of, the law of inertia, Newton's 2nd law of motion, and the law of reciprocal actions. The first, the law of inertia, is “A body will preserve its velocity and direction so long as no force in its motion's direction acts on it.” An example of this law could be when you aren't wearing a seatbelt (which you should never do) and the car...
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...Brayden Kyte 10B Aim: To investigate and analyse quantitatively the effectiveness of various safety features in a model automobile involved in a head on collision. Research Question: How do safety features of a vehicle such as seatbelts, crumple zones and airbags, reduce the impact force and forward momentum applied to the driver of the vehicle and which one is most effective? Hypothesis: The crumple zone of the model car will prove to be the most effective in slowing momentum more effectively because it will absorb most of the impact force, therefore transferring less force, and velocity to the plasticine man. Justification: Research has shown that in instances of forward collision, crumple zones will assist in avoiding fatalities in forward collision. The goal for this structure is to crush in a relatively gradual, predictable way that absorbs much of the impact energy, keeping it away from the occupants in what is termed a “controlled crush”. Newton’s first law states that an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. As a result, if a vehicle is going 60km/h, the bodies will want to continue going in the same direction at 60km/h. Newton’s second law of motion, force = mass x acceleration, conveys that as the time it takes for an automobile to come to rest or change direction is...
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...inertia and they would bang into the steering wheel, the dashboard or the windshield. The force exerted by the steering wheel or the windshield would then bring the occupants to a stop but may in the process cause injury to vulnerable body parts such as the head and the face. Car manufacturers use 2 different restraint systems to help stop the occupants while doing as little damage to him or her as possible. The oldest one is the seatbelt that spreads this stopping force across sturdier parts of the body over a longer period of time to minimize damage. The air bag is the second and a more recently developed system that is used to deploying a rapidly inflating cushion in the space between the passenger and the steering wheel or dash board to prevent crash injuries. Fig1-Diagram of an airbag.[3] 2.History of Airbag:- The car manufactures has spent a great time in advancing car safety features. The airbag is one innovative safety feature. Before the airbags that were placed in cars, the cars did not have any safety features. They had an automatic seatbelt. The car manufactures first introduced the airbag system in the 1970s. In 1971 the Ford Company tested the airbag system at an experimental fleet. Then a few years later the Chevrolet made the airbag in cars just for the governmental purposes. Later on General Motors...
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...PHYSIC AL CONSTANTS CONSTANT Speed of light Elementary charge Electron mass Proton mass Gravitational constant Permeability constant Permittivity constant Boltzmann’s constant Universal gas constant Stefan–Boltzmann constant Planck’s constant Avogadro’s number Bohr radius SYMBOL c e me mp G m0 P0 k R s h 15 2p"2 NA a0 THREE-FIGURE VALUE 3.003108 m/s 1.60310219 C 9.11310231 kg 1.67310227 kg 6.67310211 N # m2/kg 2 1.2631026 N/A2 1H/m2 8.85310212 C 2/N # m2 1F/m2 1.38310223 J/K 8.31 J/K # mol 5.6731028 W/m2 # K4 6.63310234 J # s 6.0231023 mol21 5.29310211 m BEST KNOWN VALUE* 299 792 458 m/s (exact) 1.602 176 4871402 310219 C 9.109 382 151452 310231 kg 1.672 621 6371832 310227 kg 6.674 281672 310211 N # m2/kg 2 4p31027 (exact) 1/m0c2 (exact) 1.380 65041242 310223 J/K 8.314 4721152 J/K # mol 5.670 4001402 31028 W/m2 # K4 6.626 068 961332 310234 J # s 6.022 141 791302 31023 mol21 5.291 772 08591362 310211 m *Parentheses indicate uncertainties in last decimal places. Source: U.S. National Institute of Standards and Technology, 2007 values SI PREFIXES POWER 1024 1021 1018 1015 1012 109 106 103 102 101 100 1021 1022 1023 1026 1029 10212 10215 10218 10221 10224 THE GREEK ALPHABET PREFIX yotta zetta exa peta tera giga mega kilo hecto deca — deci centi milli micro nano pico femto atto zepto yocto SYMBOL Y Z E P T G M k h da — d c m μ n p f a z y Alpha ...
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...SCHAUM'S OUTLINE OF THEORY AND PROBLEMS OF COLLEGE PHYSICS Ninth Edition . FREDERICK J. BUECHE, Ph.D. Distinguished Professor at Large University of Dayton EUGENE HECHT, Ph.D. Professor of Physics Adelphi University . SCHAUM'S OUTLINE SERIES McGRAW-HILL New York St. Louis San Francisco Auckland Bogota Caracas Lisbon London Madrid Mexico City Milan Montreal New Delhi San Juan Singapore Sydney Tokyo Toronto McGraw-Hill abc Copyright © 1997, 1989, 1979, 1961, 1942, 1940, 1939, 1936 by The McGraw-Hill Companies, Inc All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-1367497 The material in this eBook also appears in the print version of this title: 0-07-008941-8. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more...
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...Chapter 1, Introduction CHAPTER 1 Conceptual Problems C1. A room in a house has a floor area of 120 ft2. Which of the following is most likely the approximate volume of the room? a. 3 m3 b. 30 m3 c. 300 m3 d. 3 000 m3 C2. When SI units are plugged into an equation, it is found that the units balance. Which of the following can we expect to be true for this equation? a. The equation will be dimensionally correct. b. The equation will be dimensionally correct except sometimes in cases when the right hand side of the equation has more than one term. c. The equation will not be dimensionally correct. d. All constants of proportionality will be correct. C3. How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order of magnitude. a. about a decade b. about a century c. about a thousand years d. since Aristotle C4. Consider the sine of any angle between 30° and 40°. If the angle were doubled, what would happen to the sine of the angle? a. It would double. b. It would more than double. c. It would increase but be less than double. d. In different cases, it could do any of the above. C5. There are other ways of expressing uncertainty besides significant figures. For example, suppose a quantity is known to have a value between 20.4 and 20.0 and our best estimate of the value is midrange at 20.2. We could write the number as 20.2 +/- 0.2 and say that the number has a 1% uncertainty. We would...
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...“Welcome to driving in Louisiana.” I am pleased to present the Louisiana Driver’s Guide to our new and current drivers. This guide is designed to provide you with the rules of the road, knowledge to assist you in making better driving decisions, and valuable information on safety and sharing the road with others. It is incumbent upon you, the driver, to respect all traffic laws and other drivers as well. Driving is a vital part of life. It provides you with a means of attaining the necessities of daily living as well as providing you with the added convenience to move about at leisure. The driving experience, however, is a privilege and comes with great responsibilities. Please strive to become a safe and dependable driver to ensure that this privilege is not lost. Driving, the same as life, is a constant learning experience. The information contained in this guide, along with your experience and responsive actions while driving, will assist in protecting you, your family, and other drivers. This guide is not intended to be an official legal reference to the Louisiana traffic laws. It only highlights those laws, driving practices and procedures that you will use most often. It should be noted that the material in this guide is subject to change to comply with amended State and Federal legislations. Remember to buckle up. Safety belts save lives. Let’s work together to make Louisiana a safer place for all. Stephen F. Campbell Stephen F. Campbell Commissioner CHAPTER 1 .....
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...“Welcome to driving in Louisiana.” I am pleased to present the Louisiana Driver’s Guide to our new and current drivers. This guide is designed to provide you with the rules of the road, knowledge to assist you in making better driving decisions, and valuable information on safety and sharing the road with others. It is incumbent upon you, the driver, to respect all traffic laws and other drivers as well. Driving is a vital part of life. It provides you with a means of attaining the necessities of daily living as well as providing you with the added convenience to move about at leisure. The driving experience, however, is a privilege and comes with great responsibilities. Please strive to become a safe and dependable driver to ensure that this privilege is not lost. Driving, the same as life, is a constant learning experience. The information contained in this guide, along with your experience and responsive actions while driving, will assist in protecting you, your family, and other drivers. This guide is not intended to be an official legal reference to the Louisiana traffic laws. It only highlights those laws, driving practices and procedures that you will use most often. It should be noted that the material in this guide is subject to change to comply with amended State and Federal legislations. Remember to buckle up. Safety belts save lives. Let’s work together to make Louisiana a safer place for all. Stephen F. Campbell Stephen F. Campbell Commissioner CHAPTER 1 .....
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...CR TOPIC-WISE EXERCISES (700-800 LEVEL) 1 The 700-800 Club Critical Reasoning Critical Reasoning Topic 1: CONCLUSION 1. • • • • • 2. In the United States, about $5,200 per person per year is spent on health care, while in Britain the amount is about half that. A recent study indicated that middle-aged white Americans have a significantly higher rate of diabetes and heart disease than do middle-aged white Britons. Even after eliminating from the study the lifestyle differences of diet, exercise, smoking, and drinking, the data showed that the Americans have poorer health than their British counterparts. The statements above, if true, best support which of the following assertions? Health care spending in the United States should be reduced by 50%. More expensive health care causes a higher incidence of certain diseases. The money spent on health care in the United States is not being used effectively. The average health care spending for middle-aged white Americans is probably less than the average health care spending for Americans in general. Something other than diet, exercise, smoking, and drinking must account for the difference in health for the two groups in the study. Spokesperson: In the 2006 election of the city mayor, 55% of the voters were female. All the voters were between ages 18 and 70 and 2/3 of them supported the incumbent mayor. The incumbent mayor won the election with a substantially greater number of votes than any other...
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...updated: April 26, 2016 Logical Reasoning Bradley H. Dowden Philosophy Department California State University Sacramento Sacramento, CA 95819 USA ii iii Preface Copyright © 2011-14 by Bradley H. Dowden This book Logical Reasoning by Bradley H. Dowden is licensed under a Creative Commons AttributionNonCommercial-NoDerivs 3.0 Unported License. That is, you are free to share, copy, distribute, store, and transmit all or any part of the work under the following conditions: (1) Attribution You must attribute the work in the manner specified by the author, namely by citing his name, the book title, and the relevant page numbers (but not in any way that suggests that the book Logical Reasoning or its author endorse you or your use of the work). (2) Noncommercial You may not use this work for commercial purposes (for example, by inserting passages into a book that is sold to students). (3) No Derivative Works You may not alter, transform, or build upon this work. An earlier version of the book was published by Wadsworth Publishing Company, Belmont, California USA in 1993 with ISBN number 0-534-17688-7. When Wadsworth decided no longer to print the book, they returned their publishing rights to the original author, Bradley Dowden. The current version has been significantly revised. If you would like to suggest changes to the text, the author would appreciate your writing to him at dowden@csus.edu. iv Praise Comments on the earlier 1993 edition...
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