Terminal Velocity and Free Fall

Terminal Velocity and Free Fall Terminal velocity and free fall are two related concepts that tend to get confusing because they depend on whether or not a body is in empty space or in a fluid (e.g., and atmosphere or even water). Take a look at the definitions and equations of the terms, how they are related, and how fast a body falls in free fall or at terminal velocity under different conditions. Terminal Velocity Definition Terminal velocity is defined as the highest velocity that can be achieved by an object that is falling through a fluid, such as air or water. When terminal velocity is reached, the downward force of gravity is equal to the sum of the objects buoyancy and the drag force. An object a terminal velocity has zero net acceleration. Terminal Velocity Equation There are two particularly useful equations for finding terminal velocity. The first is for terminal velocity without taking into account buoyancy: Vt (2mg/Ï ACd)1/2 where: Vt is the terminal velocitym is the mass of the object that is fallingg is acceleration due to gravityCd is the drag coefficientÏ  is the density of the fluid through which the object is fallingA is the cross-sectional area projected by the object In liquids, in particular, its important to account for the buoyancy of the object. Archimedes principle is used to account for the displacement of volume (V) by the mass. The equation then becomes: Vt [2(m - Ï V)g/Ï ACd]1/2 Free Fall Definition The everyday use of the term free fall is not the same as the scientific definition. In common usage, a sky diver is considered to be in free fall upon achieving terminal velocity without a parachute. In actuality, the weight of the sky diver is supported by a cushion of air. Free fall is defined either according to Newtonian (classical) physics or in terms of general relativity. In classical mechanics, free fall describes the motion of a body when the only force acting upon it is gravity. The direction of the movement (up, down, etc.) is unimportant. If the gravitational field is uniform, it acts equally on all parts of the body, making it weightless or experiencing 0 g. Although it might seem strange, an object can be in free fall even when moving upward or at the top of its motion. A skydiver jumping from outside the atmosphere (like a HALO jump) very nearly achieves true terminal velocity and free fall. In general, as long as air resistance is negligible with respect to an objects weight, it can achieve free fall. Examples include: A spacecraft in space without a propulsion system engagedAn object thrown upwardAn object dropped from a drop tower or into a drop tubeA person jumping up In contrast, objects not in free fall include A flying birdA flying aircraft (because the wings provide lift)Using a parachute (because it counters gravity with drag and in some cases may provide lift)A skydiver not using a parachute (because the drag force equals his weight at terminal velocity) In general relativity, free fall is defined as the movement of a body along a geodesic, with gravity described as   space-time curvature. Free Fall Equation If an object is falling toward the surface of a planet and the force of gravity is much greater than the force of air resistance or else its velocity is much less than terminal velocity, the vertical velocity of free fall may be approximated as: vt gt v0 where: vt is the vertical velocity in meters per secondv0 is the initial velocity (m/s)g is the acceleration due to gravity (about 9.81 m/s2 near Earth)t is the elapsed time (s) How Fast Is Terminal Velocity? How Far Do You Fall? Because terminal velocity depends on drag and an objects cross section, there is no one speed for terminal velocity. In general, a person falling through the air on Earth reaches terminal velocity after about 12 seconds, which covers about 450 meters or 1500 feet. A skydiver in the belly-to-earth position reaches a terminal velocity of about 195 km/hr (54 m/s or 121 mph). If the skydiver pulls in his arms and legs, his cross section is decreased, increasing terminal velocity to about 320 km/hr (90 m/s or just under 200 mph). This is about the same as the terminal velocity achieved by a peregrine falcon diving for prey or for a bullet falling down after having been dropped or fired upward. The world record terminal velocity was set by Felix Baumgartner, who jumped from 39,000 meters and reached a terminal velocity of 134 km/hr (834 mph). References and Further Reading Huang, Jian (1999). Speed of a Skydiver (Terminal Velocity). The Physics Factbook. Glenn Elert, Midwood High School, Brooklyn College.All About the Peregrine Falcon. U.S. Fish and Wildlife Service. December 20, 2007. (archived)The Ballistician (March 2001). Bullets in the Sky. W. Square Enterprises, 9826 Sagedale, Houston, Texas 77089.

Drug Testing in The Workplace Essay Example | Topics and Well Written Essays - 500 words

Drug Testing in The Workplace - Essay Example The paper tells that no worker wants that his private life is invaded and suspected. You do not want your life to be your boss’s business. Individual and civil rights are the ones that are most respected giving every citizen the right to keep his life off-the-work private and not scrutinized. However, with the advent of efficient technological tools, it is difficult for a worker to hide his off-duty activities from the scrutinizers. Urinalysis drug testing is conducted when a person applies for a job to know if he is on drugs. The biggest point is the violation of privacy and civil rights. No worker in any position will want that he is being observed or that whatever he does off-duty is counted as having an effect on his performance on-duty (Hansson and Palm). Courts and judges have also been not very protective regarding privacy issues that arise in drug testing, nor have any laws or policies been designed regarding when to conduct drug testing and what to do after a person s hows positive. Also, the process of drug testing itself is privacy-invasive since a person is required to give his urine sample in the presence of other persons. This makes the process uncomfortable and disrespectful for the employee. Moreover, when a person shows positive on a drug test, he is not given any medical treatment but he is very likely to be fired. If this continues, then the society will have an increasing number of jobless drug addicts especially those who are not motivated to leave the addiction. This will result in deterioration of the society on the whole.

Paper 3 Term Example | Topics and Well Written Essays - 250 words

3 - Term Paper Example o lower the women into the lowest type of cesspool possible that cheapens their identity and individuality by portraying them as nothing more than objects of sexual desire who cannot amount to anything if they do not sell their sexuality. On television, the high standard and regard for women can be seen in the character of Kate Becket on the detective show Castle aired over ABC. She represents her gender and white race in a manner that commands the respect of the men and others around her. Unlike the Madonna and Lady Gagas out there who cheapen themselves in order to stay ahead of the game, Beckett is the epitome of the female sex as she manages to come across as sexy without having to reveal too much flesh but also being an independent minded woman who can take care of herself if no man is there for her because she is a self- respecting police officer who uses logic instead of her heart to get her ahead in the game of life. Kate Beckett represents the modern woman who does not need to dress seductively all the time and act trashy or like a tramp in order to get her man or get ahead in her line of

Hinduism, buddhism and sikhism Essay Example | Topics and Well Written Essays - 1000 words

Hinduism, buddhism and sikhism - Essay Example his seven dimensions of religion.These are;practical or ritual,experiential or emotional,narrative or mythical,doctrinal or philosophical, legal or ethical,social or institutional and the material/artistic dimensions. In Hinduism, offerings and petitions are practices which enable them to connect to divine powers so as to solve their problems at the same time fulfilling their desires. Similarly, the Buddhist engage in detailed prayers which are intimate to show dedication to God. The Sikhs engage in a disciplined way of life of Naam Simran which is a way to meditate on God’s name. Hindus of all levels in society perform artistic dance, drama, music, poetry and representational arts and also practice cylindrical festivals which are sacred. Buddhas evoke Sangha to spread Buddha teachings after which the dharma students perform three bows or the three gates (body, tongue and mind). The palms of their hands, knees and forehead should touch the ground to signify earth, water, fire, air and space. The Buddha students bow during prayers with folded hands to signify Buddha of the past present and the future. The Sikhs live a disciplined life and no benefits are gained no matter where one is born since they all have to meditate (by reciting Gurbani and Kurtan which are music hymns) and give selfless service (by doing manual work at the Gurdwara e.g. cleaning dishes and floors) and wear Kesh, Kanga, Kaccha, Kara and Kirpan (Llewellyn 6-18). This refers to feelings and experience of various religions which incorporate stories of how their leaders experienced contact with either divine beings or energies. In Hinduism, Hindus assume to be concerned with spiritual enlightenment or the ultimate act of liberation (moksha). The urban elite and the rural Hindus dedicate their time and energy to obtain prosperity. In Buddhism, the most important emotional experience is meditation that enables emotional awareness and enlightenment. For instance, the Buddha connecting with the

The Introduction to A Day in the Life of Jane :: essays research papers

The discomfort of the hard seat I was perched on, and the stiffness in my lower body, caused me to wake suddenly. My eyes jolted open to reveal a coach full of rowdy strangers. The noise of the people around me made my ears unpleasantly shriek, my mind full of frustration. I tried to disconnect myself from the world around me, covering my ears with my warm, soft hands. My mind wandered back to the world of tranquillity and peace where I had previously been, urging me to stay there forever. I could feel the warmth of the sun glaring on my face. My cheeks felt cleansed from the combination of the heat and the regular dose of gentle breeze streaming through the partly opened window. However, the echoes of laughter and the cries from those around me crept into my world of calm, forcing my eyelids to drift apart once again. This time I decided not to close them. I looked around me, thinking of the day ahead. I felt excited, although quite nervous about the protest I was about to become a part of. I wondered if it would be similar to the one that was held in Birmingham, the preceding year. I had enjoyed that immensely, knowing that I was part of something that could change people's lives, people's undecided futures. The protests were arranged by an organisation called Jubilee 2000. There aim was to try and persuade developed countries to cancel the huge debts owed by poorer countries. Every year a human chain was formed around the location of the G8 summit, to try and get leaders of the richest countries of the world to 'drop the debt'. My mother gently snored beside me, her chest expanding and deflating like a balloon. Occasionally her body twitched, gently touching my side. I turned myself casually to face my father, who was predictably awake, already enthralled in the train magazine he was reading. These magazines were his only accustomed reading material, and unlike him, I claimed that they were undoubtedly 'boring'. However, what could one expect from a man who spent his teenage years pacing station platforms, bracing himself for the next arrival. Dad saw me peering at him through my tired, puffy eyes and sang his normal daily rendition of "Good Morning Paino!" wide eyed, and abnormally cheery.

Principle Agent Moral Hazard

The major issue was that the commercial banks overstressed in such mortgage backed securities. Another part of the story Is that Basel I accords are credited with giving seeds to the idea of all things that could lead to recession and Basel II Is credited with magnifying Its Impact. Formed In 1988 and adopted by 1992, Basel I accords were a set of rules and regulations, to be adopted by GIG countries, that allotted different risk ratings to various types of assets held by banks. Assets, here, referred to bonds, mortgages undo etc.It took a long time for the economies to realist the problems associated with such types of system. For example, in such a framework a commercial bank was permitted to keep aside no liquid capital if it had all government bonds or gold as assets. This was so because such assets were considered safe. Further, it was required of them to keep aside small percentages of capital for every mortgage, commercial loan or bonds they Issued. With the introduction of Ba sel 2, the list was expanded to bonds backed by debts like ar or property loans and yet had to keep only a 2 percent of spare capital.Flip side to this was that the bonds ought to have AAA or AAA credit ratings from the government. Statistics tell that Just prior to the recession, 81 percent of all Mortgage backed securities held by the commercial banks had AAA credit rating. Further, 93 percent of all mortgage-backed securities held by these banks had AAA credit rating or held bonds Issued by a government-sponsored enterprise. Now this Is where the role of moral hazard comes Into play.When Basel I and abstinently Basel II accords were Introduced, the primary aim of the developed economies was to encourage consumer spending and Investments by the banks. It was not completely unforeseeable for everyone to realize that backing debt or junk manipulating credit ratings, economies tried to create a self-fulfilling system that provided for feed as well as fed upon its own. The bankers wer e in turn incentives to take risks of high magnitude, with all the depositors' money in hand, believing that there is a government always backing them.Soon the entire system gave away. This created a bigger moral hazard. How to minimize such problems? TO reduce such a problem of Principal Agent problem leading to recession, it is imperative that the regulators are on their toes. In USA, SEC did not take proper steps to ensure that the Rating agencies don't rate securities high without any strong backing to do so. Also the FIDE, the Fed, the Comptroller of the Currency, and the Office of Thrift Supervision relied blindly on the ratings given by the Credit rating agencies.Therefore, all rules and regulations given under law should be implemented properly and Justly by the regulators. The government should also ensure the timely passage of relevant legal provision and bills. Also, although Basel Ill accords have been adopted and implemented by most of the countries and the deadline is 2019 for it, the present market conditions show that the Minimum Capital requirements need an overhaul as well. Hence, Basel 4 could be started to be worked upon with refined changes and the governments should follow the rules under such requirements.

Effects Of Parental Neglect On Children From Ages 8-13

Assignment: Research Proposal - Draft of Introduction Tameika N. Martin PS504 July 5, 2016 Delores Harrell Assignment: Research Proposal - Draft of Introduction The subject of this particular research proposal is: Does parental neglect cause aggression in children from ages 8-13. The thesis statement for this subject is: Even though childhood aggression can come from things other than parental neglect, and not all neglected children have anger issues, neglectful parents can cause children to have anger issues because when children feel neglected, they become withdrawn and internalize their feelings, this act could cause children to become violent and parents who are neglectful, do not realize when their children are having emotional issues. Children who have unresolved anger issues end up becoming adults with unresolved anger issues or adolescents with anger issues. There are many different things that can be the cause of aggression in children. Those things include being abused by parents, being sexually abused, and being bullied at school, to name a few. The focus of this paper is parental abuse and its effect on the child, more specifical ly can it make a child violent? According to brainsontrial.com, â€Å"Some kids will become violent as adolescents. Many have a very short fuse, and explode over the smallest thing. Others, like a ticking time bomb harbor pent up anger until something pops. And then there are kids who are the scariest – the ones who silently plan toShow MoreRelatedEssay about The Effects of Domestic Violence on Children1448 Words   |  6 Pagesviolence between parents and parental figures affect the children who witness it? This is a question often asked by Sociologists and Psychologists alike. 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