Calculate Young`s modulus Essay Example for Free

Calculate Young`s modulus Essay Thus of course meaning that factors that need to be kept constant must be identified and kept that way. In this scenario I will be isolating Force as my variable. Force is directly related to the load on the wire; only multiplied by the gravitational pull (approx. 9. 81) as the load is measured in Kg as it is a mass. From the equation we can see that a change in Force will indeed affect the extension of the wire, at this stage it is apparent to say that; Theoretically the larger the force the greater the extension according to the equation above, as it is the value that is being divided. Following this it is also imperative that both the Cross sectional area of the wire is indeed accurately measured, as well as remaining constant through out the experiment, as a change in this value would indeed effect the value for Tensile stress, and in turn the extension. The length of the wire must also remain consistent through out the experiment. This is because each unit of wire will stretch or elongate by a proportional amount to the load being applied to it. Thus changing the length of will increase or decrease the amount of units of wire that can be stretched, causing different readings to be measured. The wire will indeed elongate and extend no matter what the length, but for these experimental purposes it is best to be long as explained above to stand a greater chance of measuring it properly. The important thing is to set the length of wire you wish to work with and do not change it. B) Implementing Results, observations and description. Cross sectional diameter of wire Measurement number and degrees of rotation 1/mm 2/mm 3/mm 1/ Average   Calculation of Average wire diameter=Thus the average cross sectional area of the wire is Force = mass 9. 81 ms Table of readings Final length, attempt; Mass/g Mass/Kg Force/N Orig. L/M 1/M 2/M 3/M Mean Extensionnfortunately errors can easily occur in this experiment, the first way of minimizing the percentage error in the experiment is to identify the sources that could cause such a problem; these being. When measuring the extension there are 3 main sources of uncertainty. Meter rule Parallax error   Zero error I plan to minimize these by;   Careful choice of meter rule, as man are bent and warped   Fixing a head and eye position against something so that the parallax error is minimized as I will be looking at the ruler from exactly the same angle. Record results from 0. 0 M   If there is a zero error, take it away from the results. When measuring the weight of the mass the following sources could effect the results; Zero error on the scales Not allowing for the weight of the cradle Simply using the weight that is imprinted on the mass instead of weighting it. I will minimize these sources by selecting my masses carefully and weighing each one separately to find its exact weight, as well as double checking a pair of scales against each other by putting the same weight on both scales to see if there is a zero error. The final measurement source of error is the measurement of the diameter of the wire. This is typically a source of inaccuracy because the wire does vary in cross sectional area, because of the way it was made. This can be accommodated for by measuring the wire extremely accurately with the micrometer, and measuring the wire in three different areas of the length and taking two readings at each of the three points along the wire, twisting it 90 degrees at each point to allow for ovals etc. The average can then be taken and used in the calculations to give a better representation of the wire being used Diagram of ideal and misshapen wire. Observations for experiment conducted on the 14th of December 2002 * At approximately 0930 the equipment was set up and the working area was in suitable condition to go ahead with the experiment as planned. I had two main concerns whilst conducting the experiments, these were of measuring natures, the first of these being that, when measuring the wire with the micrometer it proved initially extremely hard to turn the wire 90 degrees, I quickly remedied this by sticking a label on the wire so that it was clear what angle the wire had to be turned.   The second was that of concerning minimization of the parallax error, this proved to be quite challenging, so we decided to look at the ruler twice each a couple of seconds apart and in what i8 thought was the same position to see if it was a fair test. This way through up different results so we deemed it necessary to have someone stand over the wire and not move until the experiment was finished to minimize this risk.   Another observation I made was that I didnt think we were measuring the extension accurately enough I felt that measuring it to 1mm was far to inaccurate as the extension as will be seen by the graphs was minimal, I will mention this point heavily in the Evaluating.   The equipment was packed away and the experiment was completed within the hour.   I observed a changing in mass or load on the wire and no change in any of the identified variables. C Analyzing Evidence and Drawing Conclusions. Force/N Area/M Sress/Nm (Pa) Length/M Extension/M Strain Youngs modulus 1 The stress was simple to calculate as it simply meant dividing the force by the area, as so; The strain is a simple ratio it involves dividing theextension by the length; Thus the youngs modulus can be found for every plotted point separately on the graph; this is done by dividing the stress by the strain. As I predicted earlier the material obeys hookes law and froms a straight line through the origin until the elastic limit is reached. As well as we can calculate the extension from the gradient of the graph because its equal to L / EA. When a material obeys Hookes law, then its force, extension graph is a straight line through the origin (see graph). This is only the case up to the proportional limit. The graph being a graph of force against extension, the area is the energy stored in the wire. As the equation of the graph is F=kx, the equation of the area is . From the graph we can say that as the load increases on the wire the extension also increases proportionally, up to a certain point known as the elastic limit, this is because it is obeying kooks law as described above, and for this material whilst under low load the strain is proportional to the stress.. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

netherlands :: essays research papers

Netherlands Location: Western Europe, bordering the North Sea, between Belgium and Germany Geographic coordinates: 52 30 N, 5 45 E Map references: Europe Area: total: 41,526 sq km land: 33,883 sq km water: 7,643sqkmArea - comparative: slightly less than twice the size of New Jersey Land boundaries: total: 1,027 km bordercountries:Belgium 450 km, Germany 577 km Coastline: 451 km Maritime claims: exclusive fishing zone: 200 NM territorial sea: 12 NM Climate: temperate; marine; cool summers and mild winters Terrain: mostly coastal lowland and reclaimed land (polders); some hills in southeast Elevation extremes: lowest point: Prins Alexanderpolder -7 m highest point: Vaalserberg 321 m Natural resources: natural gas, petroleum, arable land Land use: arable land: 25% permanent crops: 3% permanent pastures: 25% forests and woodland: 8% other: 39% (1996 est.) Irrigated land: 6,000 sq km (1996 est.) Natural hazards: flooding Environment - current issues: water pollution in the form of heavy metals, organic compounds, and nutrients such as nitrates and phosphates; air pollution from vehicles and refining activities; acid rain Environment - international agreements: party to: Air Pollution, Air Pollution-Nitrogen Oxides, Air Pollution-Persistent Organic Pollutants, Air Pollution-Sulphur 85, Air Pollution-Sulphur 94, Air Pollution-Volatile Organic Compounds, Antarctic-Environmental signed, but not ratified: Biodiversity, Climate Change-Kyoto Protocol Geography - note: located at mouths of three major European rivers (Rhine, Maas or Meuse, and Schelde) Netherlands People Top of Page Population: 15,981,472 (July 2001 est.) Age structure: 0-14 years: 18.38% (male 1,501,925; female 1,436,017) 15-64 years: 67.9% (male 5,518,575; female 5,333,442) 65 years and over: 13.72% (male 899,052; female 1,292,461) (2001 est.) Population growth rate: 0.55% (2001 est.) Birth rate: 11.85 births/1,000 population (2001 est.) Death rate: 8.69 deaths/1,000 population (2001 est.) Net migration rate: 2.34 migrant(s)/1,000 population (2001 est.) under 15 years: 1.05 male(s)/female 15-64 years: 1.03 male(s)/female 65 years and over: 0.7 male(s)/female total population: 0.98 male(s)/female (2001 est.) Infant mortality rate: 4.37 deaths/1,000 live births (2001 est.) Life expectancy at birth: total population: 78.43 years male: 75.55 years female: 81.44 years (2001 est.) Total fertility rate: 1.65 children born/woman (2001 est.) HIV/AIDS - adult prevalence rate: 0.19% (1999 est.) HIV/AIDS - people living with HIV/AIDS: 15,000 (1999 est.) HIV/AIDS - deaths: 100 (1999 est.) Nationality: noun: Dutchman(men), Dutchwoman(women) adjective: Dutch Ethnic groups: Dutch 91%, Moroccans, Turks, and other 9% (1999 est.) Religions: Roman Catholic 31%, Protestant 21%, Muslim 4.4%, other 3.6%, unaffiliated 40% (1998) Languages: Dutch total population: 99% (2000 est.

Full Time Job Narrative Essay

I had just graduated from high school; a typical Santa Barbara local, with ambitions of attending SBCC. I always did fairly well in school, but was definitely more concerned with how the waves were breaking, instead how of my grades were. That all changed on June 15th. I got a call from a family friend asking if I would be interested in a summer job at a shipping warehouse in Carpinteria. My parents had been nagging me day in and day out to get a summer job, so this seemed so perfect. I accepted the job and my friend let me know I should show up at 7:30 Monday morning for my first day of work. That Monday morning, I woke up late and stumbled out of bed, threw on some clothes and was out the door with no time for breakfast. I will never forget that car ride down to Carpinteria, and the anxious feelings I felt in my stomach. My mind was racing in a million different directions and I really had no idea what I was in for. Pulling up to the warehouse, I remember the cold wind blowing across my face, the distinct smell of ocean heavy in the air, and the flapping of the State Park flags in the distance. The job description my friend gave me over the phone didn’t really stress how labor intensive it would be, so my first day I was in for quite a surprise. All day I was packing and carrying 60-70 lbs packages and not a minute went by where I didn’t regret taking my new job offer. Much to my surprise, my coworkers were all much older than me, and it was somewhat depressing to see people my parents and grandparents age doing such laborious work. One of my coworkers was an older woman named Maria, who sort of acted like the â€Å"mother† around facility. She didn’t speak the best of English, but despite that, we quickly became friends, and shortly thereafter Maria began giving me all sorts of advice and pointers she thought would benefit me in life. Once she found out how old I was, she asked what my plans for school were. I let her know school wasn’t something I was too worried about but that I would be attending City College in the fall. The look on her face was unforgettable. She looked back at me and said â€Å"Sammy, School is the most important thing in your life†. Maria went on to say â€Å"look around you; all these people have sad expressions on their faces. They didn’t have the opportunity you are blessed with. You need to realize school will lead you to a more successful and happy life. â€Å"That day on the drive home I looked out at the ocean and thought how nice it would be to have zero obligations anymore and just be able to hangout at the beach. It was at that moment that I actually realized that any dream is completely unachievable without vision, determination and hard work. After my three months were up, my mindset towards school had completely changed. Maria’s words burned into my head that -I no longer thought of myself as a lazy surfer who just wanted the bare minimum, but rather as a determined young student. School used to seem like an inevitable obstacle you had to endure, but now I truly see the importance and value of an education. While I admired the work ethic of the people I worked with in the warehouse, I know that through higher education, there is better future for me.

The Mexican American War A Controversial Event - 1543 Words

The Mexican American War was a very controversial event. The Americans believed in their â€Å"Manifest Destiny† which prompted them to annex the territory of Texas which, in turn, initiated the war on April 25, 1846. Texas was annexed to the Union as a slave state on December 29, 1845. This upset all of the Free states along with the Mexicans but the Southerners were in favor of the war because it gave them more strength when fighting for slavery. While there were many different beliefs about the Mexican-American War throughout the United States, these beliefs generally were the same within a region. What were New England’s opinions? The people in New England believed that the war was unnecessary and had been caused by the President of the United States. There were many reasons that they thought this. These people from the Northeast region of America were generally Whigs and disapproved of the democratic president James K. Polk. 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