Joules law Essay Example for Free

Joules law Essay Variables and constants   The one variable in this experiment will be the load placed upon the wire, this is the obvious variable because as seen in the formula. By rearranging the formula to; e = F L A E We can see that there are 3 main factors which will effect the outcome of the experiment. The E symbolizes Youngs modulus, which will be effected by changes but is not itself a single factor as it is a measurement of the factors. In order for the experiment to be a success, it has to be a fair test. 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 Average 0 Calculation of Average wire diameter= (0. 195 + 0. 185 + 0. 1925) / 3 = 0. 1908mm 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 Extension/ Unfortunately 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 rul 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.

Governmental Family Policy Essay -- Women Feminist Papers

Governmental Family Policy The modern working woman is struggling to balance work and family. The Second Wave of feminism has pushed her into the workforce, promising its ideals of equality in wages and in the home. However, many women find themselves in a world that devalues their work in home and in the workplace. Our society has not yet caught up to the Third Wave of feminism, which attempts to break down the traditional gender roles our constructions of work and family are based on. Many are hoping that government intervention through work policies that reflect the demands of an egalitarian family will be able to propel men and women out of the "stalled revolution". One must now address the question why the United States government is not following the lead of other industrialized nations if they are so supportive of "family values" and "moral values." Until there is a public outcry that can no longer be ignored, which is fast-approaching, the government can continue playing with words in order to avoid accountability. The problem exists with how these policies are categorized. The common term applied to such policies is "social benefits." This language alludes to the "social welfare state"-an ideal a liberal democracy like America does not strive to uphold. The American attitude for such concerns is usually along the lines of "you have your rights, now work it out for yourself." However, it is crucial to break down the relation between these family-friendly policies and the word "benefits." Progressive policies do not predominantly "benefit" working mothers. Without such policies, women cannot pursue their right to earn a living in the same way a man could. Earning a living is not a "benefit," equal opportunity fo... ...ing Job For Kids." 21 Jan. 2003 http://lexis-nexis.com Coltrane, Scott. Family Man. New York: Oxford UP. (1996). Contemporary Women's Issues. March 2003. Vol. 52, No.2. http://lexis-nexis.com De Pasquale, Lisa. "The PC Workplace." The Washington Times. 27 April 2003. http://lexis-nexis.com English, Holly. "Workplace Issues; When employers deal with 'gender issues,' they need to include men." Legal Times. 10 Nov. 2003. http://lexis-nexis.com Fuss, Diana.. "Inside/Out." Critical Encounters: Reference and Responsibility in Deconstructive Writing. New Brunswick: Rutgers University Press, 1995. 233-240. Hochschild, Arlie. The Second Shift. New York: Rutledge Publishing, Inc. (1995). Gerson, Kathleen and Jacobs, Jerry A. Changing the Structure and Culture of Work. Journal of Women's History. September 2003. Vol. 15, No.3. http://lexis-nexis.com

Bighorn Sheep

~ The bighorn sheep is a species of sheep in North America named for it‘s large horns. ~ Their horns can weigh up to 30 pounds , while the sheep themselves weigh up to 300 pounds. ~ Ovis Canadensis is the scientific name of the bighorn sheep. ~ Male bighorn sheep or â€Å"rams† are easily identified by their large spiral horns which grow throughout their lives. An adult ram's horns may measure over 30 inches each in length and reach 15 inches in circumference at the base. Female bighorn or â€Å"ewes† have slender, straighter horns that grow throughout their lives to lengths of 8-10†³ for Rocky Mountain bighorn ewes and 12-17†³ for desert bighorn ewes. Young bighorn that are less than 1 year of age are referred to as lambs. ~ At the beginning of the nineteenth century, bighorn sheep in North America were estimated to number between 1.5 and 2 million, but today less than 70,000 remain. In the late 1800's, hunting, competition from livestock grazing, and diseases introduced by domestic livestock devastated bighorn populations. Although problems with domestic livestock are subsiding, they still exist and are now accompanied by accelerating habitat loss and human disturbance. Habitat loss and fragmentation are recognized as the most significant threats facing bighorn sheep today. Natural predation from mountain lions, coyotes and bobcats also pose a risk to bighorn populations that have dwindled to low numbers. ~ An entire subspecies of bighorn sheep, the Audubon bighorn, which inhabited parts of Montana, North Dakota, South Dakota, Wyoming and Nebraska was extirpated by 1925. At various times in the early 1900's, bighorn sheep were extirpated from the states of Washington, Oregon, Texas, North Dakota, South Dakota, Nebraska, and the Mexican states of Chihuahua and Coahuila.Fortunately, many populations have been re-established through transplanting bighorn sheep from healthy populations to vacant habitat ~ Rams typically live 9-12 years, while ewes usually live 10-14 years ~ Although the diet of bighorn sheep varies according to the habitat and season, bighorn primarily eat grasses, shrubs, and forbs. Some favorite shrubs for desert bighorn sheep are acacia or catclaw, encelia, sweetbush, and krameria. Generally, bighorn sheep are opportunistic feeders that adapt their diet to the forage available. ~Mountain lions, wolves, bobcats, coyotes and golden eagles are predators of bighorn sheep. Eagles have been known to prey upon lambs, but they are unable to kill adult bighorn. Predation is usually not a problem for healthy bighorn populations; however, when bighorn are supressed by other factors, predation can limit recovery and potentially drive a population to extinction ~ The breeding season, or rut, generally extends from August-November for desert bighorn sheep and October-January for Rocky Mountain and California bighorn sheep. It is during this time that rams clash heads to fight for dominance. In each band of rams there is a dominance order, and the higher ranking rams do most of the breeding. Genetic studies are currently underway to determine the percentage of breeding completed by dominant and subordinate rams. Bighorn sheep have an approximately 6 month gestation period and most ewes give birth to one lamb per year.

Around The Business - Free Essay Example

Sample details Pages: 2 Words: 591 Downloads: 7 Date added: 2019/08/06 Category Economics Essay Level High school Tags: Macroeconomics Essay Did you like this example? As recently referenced, organizations that have been around the business for whatever length of time that Nike has, are frequently viewed as in their develop stages and not in the development arrange. As Nike has pronounced development as their key technique (Nike, 2017) throughout the previous couple of years, this is an astonishment and straightforwardly opposing to what hypothesis proposes. Development organize organizations are regularly known as new businesses and organizations that are entering new positions in the market. Don’t waste time! Our writers will create an original "Around The Business" essay for you Create order Regularly, when an organization achieves the develop phase of their business cycle they cant discover was to develop from inside and they start to develop through procurement. Nikes inconceivable history has empowered them to cross the two ways, they have become naturally through a wide range of item dispatches and focusing on what they make best, while offering innovativeness to their fashioners and confiding in them to concoct the following huge item. This has pushed the organization forward. Presently they have additionally made vital acquisitions to achieve a much increasingly different customer base. The rugby item offering will take advantage of a market that is developing and will enable Nike to additionally develop with the game. A standout amongst other things about development is that it makes chances to grow not just in the item zone or in entering another market yet in addition in the current work compel. This item dispatch will require the individuals who are enthusiastic about rugby to approach and make new employments that can join two of their current goals. The present joblessness rate in the US for the period of August is 4.1% (Agency of Work Measurements, 2017). The US joblessness rate has been diminishing continuously since the start of 2017. The economy has recuperated from the monetary emergency when joblessness came to underneath roughly 10% the country over (Agency of Work Measurements, 2017). This item dispatch wont build the operational effectiveness of the organization as to take out positions, however it will include numerous new occupations because of the item family. Consequently this will build the general CPI and Gross domestic product and thusly give shoppers increasingly optional pay to buy things they want, for example, Nike items. Notwithstanding animating customer spending, this will address a portion of the other monetary issues that retail locations are at present looking all through America. The atmosphere for retail has turned out to be progressively focused from internet business. Nikes leverage originates from incorporating into the network and getting individuals on the ground collaborating with others inside the network. In the event that swelling is specifically attached to key expenses and not simply over esteemed stocks, at that point it would adversity affect the item dispatch of the new Nike rugby fragment. As referenced in the past areas, Nike has possessed the capacity to climate each major financial downturn amid the most recent two decades. They began developing when the worldwide economy was smashing, they stayed stable amid high unstable and swelled valuation eras. This dispatch isnt delicate to numerous financial variables that would turn out to be adverse for other people. Actually, Nike is all around expanded in their item contributions, geological areas, and financials that they can climate different kinds of downturns and tempests. The Nike rugby item dispatch would just be adversely affected if creation volumes were poor or the nature of good endured. Moreover, item supports would endure if the competitors were neglecting to be the substance of the brand that is expected of them. The y have to speak to Nike and stay with the above water amid this time.