Using a pendulum Essay Example for Free

Using a pendulum Essay To find the gravity by finding the period of the oscillations of a pendulum and plotting a graph. Hypothesis and Prediction: the gravity from the graph is going to equal the gravity from the formula. Variables: The independent variable is the length of the string The Dependent variable is the period of one oscillation Controlled variables are: mass of the pendulum Equipment: -Brass Ball -string -boss and clamp -stopwatch -2 metal blocks -Meter Ruler -Micrometer -The diameter of the brass ball was measured using a micrometer. Then the value was divided by 2 to give the radius.-the length of the string was measured -two metal block were clamped with the string in between, the string was tied to the bob -the bob was pulled to the side and released -the time was started when the bob passed the reference line. -a full oscillation is when the bob passes the reference line forth back and forth again. the length of the string is increased or decreased in a regular pattern the time was monitored by reading through the stopwatch. -the same brass ball was used over the experiment to keep the mass constant. the length was varied 10 times with a 10 cm difference. -4 readings were taken for each 10 cm -the time was taken for 20 oscillations. And then divided by 20 to give one oscillation. Data Collection: Table number Length of String / M i 0. 05 Number of oscillations Time Taken/s i 0. 5 Period/s i The table contains the length of the string in meters, the number of oscillations, the time per 20 oscillations and the period of one oscillation. As the length of the string deceases , the time for 1 oscillation decreases. So the length of the string is directly proportional to the period. Data Processing and presentation: Example in working out average period when the string is 1. 01 The graph is plotted with Average period squared against length of string. Y=3. 9244x-0. 0087 3. 9244=gradient. 3. 9244= (4(pi)^2)/g g = (4(pi)^2)/3. 9244 g=10. 060 from the graph. The average gravity from the formula= 100. 614/10= 10. 614 Conclusion: the results where very close to the prediction but they werent the same as the graph is a scatter diagram.-the result from the graph is more accurate as the graph cancels inaccurate measurements. Evaluation: -the method had weaknesses. -the angle of the pendulum to the reference line isnt the same in each reading which might cause a slight error. -the Air conditional may effect the pendulum; it may change its speed or change its direction. it is difficult to stop the stopwatch and start it in the reference line exactly which might induce error sometimes the ball tends to move in a circular motion and the experiment will have to be repeated.

Critique of a Study; Muscle Dysmorphia - excellent paper :: essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  Last year a study was performed to examine a model for the development of muscle dysmorhpia among male college athletes. The model is known as the Lantz, Rhea, and Mayhew Model and it describes the relationship between pre-disposing factors for the development of muscle dysmorphia and the negative consequences paired with the disorder. The study concentrated on male college athletes falling into three different categories: weight lifters, non-contact sports athletes, and contact sport athletes. The study was to determine which of the expected negative behaviors, if any, prevailed among the separate categories.   Ã‚  Ã‚  Ã‚  Ã‚  Over the past decades the media has been the primary blame of creating body image disorders among both females and males. â€Å"Similar to females, men have been inundated with distorted pictures representing the ideal male physique from TV, fitness magazines, and the toy industry (e.g., bulging superhero, G. I. Joe). While most researchers suggest that a multitude of factors may play a role in creating body image disorders (Pike & Striegel-Moore, 1997), Levine and Smolak (1998) are among a growing number of researchers who blame the media's glamorized body blueprint messages for men and women unrealistically judging themselves. (Page 120)† Men with body image disorders are usually afraid of being too small rather than too large. They tend to have the desire to gain muscle mass at the same time as cutting down the waist line. Along with this desire, an obsession can occur to compulsively lift weights as a way of life. The compulsive weight lifting and consumption of dietary supplements describes the term â€Å"muscle dysmorphia†. This disorder is more mental than physical and may also be a type of obsessive-compulsive disorder. â€Å"In a manner similar to MD, OCD is manifested by obsessions (e.g., constant thoughts about being too small) and compulsions (e.g., repeated behaviors of weight-lifting). (Page 120)† Muscle dysmorphia can also create other mental disorders. It may actually be genetically impossible for some to reach their ideal body. This creates an individual who obsesses over a goal which is non-existent, creating possible depression and perhaps impairing social and occupational functioning. The model of muscle dysmorphia has yet to be tested and this study is to determine if the psycho-behavioral characteristics proposed by the model are present, and to what degree, in the selected weight lifters compared to other athletes. A sample student body of 106 students was selected as the participants. This group contained 29 weight lifters, 24 non-contact sport athletes, and 53 contact sport athletes.

Econ 256 Final

2. Why do economists generally regard median income as a better measure of a typical American's well-being than mean income? Dfiodifaje 3. Why do the United States, and many other counties, have antitrust laws on the books? What's so harmful about oligopoly that warrants an entire body of law? The United States and many other countries have antitrust laws on the books to protect their consumers in their different markets. Having the abilities to both raise and lower prices are the reasons that oligopolies are so harmful. . Two consumers go to the insurance company to purchase some life insurance. James is a smoker and a police officer who races motorcycles in his spare time. Kathy is a nonsmoker and a librarian who likes to make quilts in her spare time. The insurance company knows that both consumers are 40 years old, but the company has no information about occupations or hobbies. How does the private information in this situation create an adverse-selection problem? How could the insurance company lessen this problem? Without knowing the background information on the potential clients, insurance companies are without the ability to see that while James is risking his life as a police officer, he is also a smoker and racer. He’s putting his life on the line and still increasing the risk of injuries. The insurance should have a line on their application that asks for applicants for their occupation, whether they are smokers or if they drink, and lastly what they enjoy doing in their spare time. With having this information, the company can see what each of the individuals really needs insurance-wise. 6. Jane works part-time and earns $12,000 per year. Because she is below the poverty line, she also earns $4,000 in various welfare benefits. Suppose she is offered a new job that would pay her $15,000 and would bring her earnings high enough so that she no longer qualified for any welfare benefits. This is what is known as a â€Å"notch†. Explain what is happening with Jane and how could we modify the system to eliminate the notch.

Cell Phones Should Not Be Allowed - 1276 Words

Cell phones should not be allowed in school. They are classroom distractions, and not a learning device. Every year many students complain about not being able to use their cell phones in school. And every year many schools eventually cave to cater to the things that students complain most about. Schools have been changing and bending rules so that students so that they can use their cell phones during school hours. They claim that they can be use as learning devices, which they can be, but you don’t need a cell phone. Many teachers love having the students have cell phones in school. and one reason why is it’s â€Å" easier † to have them. â€Å"This past summer, we too began to question our cell phone policy. It occurred to us that everywhere else in society, we have been taught when cell phone use is appropriate and when it is not. For example, church services often start with a reminder to silence all cell phones. We realized that our students also need to be taught appropriate use. Now, use in the classroom is still off-limits, but in the cafeteria or hallways, use is allowed. When students enter a classroom, they are greeted with a reminder about appropriate use. We have seen a drop in disruptions related to electronic devices, and parents have welcomed this more relaxed policy.† —Dave Stovenour, Assistant Principal Dundalk High School Baltimore County Public Schools, Maryland In this article Stovenour talks about how relaxing the cell phone rules have helped the students, andShow MoreRelatedCell Phones Should Not Be Allowed993 Words   |  4 Pagesconstantly on it. Cell phones for instance they can either be used or abused. In the classroom cell phones should not be allowed due to the fact people are distracted when using it during class. Cell phones distract people in a billion ways; social media, texting, pictures, calls. People can’t multi task, it is impossible. Scrolling through Instagram while the teacher is talking will not make a person learn better, and probably not at all. Everyone is addicted to his or her cell phone, it makes it hardRead MoreCell Phones Should Be Allowed in School802 Words   |  4 Pagesabout one another. You discover that you do not have a cell phone or any device to contact your parents. There won’t be any chance that you and your parents could contact each other. What would you do? How would you feel? It seems to me that if cell phones were allowed in schools, students could contact their parents easier and people could stay in touch. Therefore, cell phones should be allowed to be used in schools. For one, cell phones could provide students with academic help. According toRead MoreShould Cell Phones be allowed in School817 Words   |  4 Pagesï » ¿Should Cell Phones be allowed in School? Do you take your cell phone with you to work, and use it all day long for organization and needed communication? Well, school to us students is like our work, but our organization and communication tool is prohibited. Cell phones have so many positive uses in the classrooms, yet at the same time we aren’t putting our current technology to good use. For example, cell phones in our school are banned, and I feel that this should be changed immediately. The manyRead MoreShould Cell Phones Be Allowed? Classrooms?1586 Words   |  7 Pagesfurther educate young minds. Currently we have endless access to knowledge with the use of cellphones and schools are still hesitant to allow these impeccable devices in classrooms. Schools should take advantage of technology and allow the use of cellphones for educational purposes in classrooms. The reasons why we should use cellphones in school and in classrooms are because they can keep students informed on class assignments, they make the clas srooms more active and they can be used to record differentRead MoreShould Cell Phones Be Allowed? Schools?1918 Words   |  8 PagesSchools should be turning the perceived obstacles into opportunities to learn,† said Kipp D. Rogers. Kipp is a principle at the Passage Middle School in Virginia and he wants phones to be used in the school. The essential question is, should cell phones be allowed in schools? In a big debate, there are two sides to an issue and people are seeing both sides Many people want them because they can help students learn, but others say no because they can be a distraction. Students should be allowed toRead MoreShould Cell Phone Use Be Allowed in Schools?986 Words   |  4 Pagesdebate and discussion has been student cell phone use. Are they helpful or useless? Should they be allowed or not? No school has really found the answer to these questions yet. Many believe that phones are just too distracting for students, but on the contrary, cellphones are beneficial to students if not the entire school when used in agreement with the school’s technology policies, assuming these policies are well-thought-out. It has been shown that with cell phones, schools can increase communicationRead MoreCell Phones Should Be Allowed in Schools Essay examples824 Words   |  4 Pagesbecause cell phones were not popular in schools then. When it comes to cell phones, some people think they should not be permitted in schools, and other people think they should be permitted in schools. I agree with the latter opinion for the following reasons: Cell phones are an efficient way to communicate when emergencies occur in school; cell phones can be a great tool for learning during school hours; and the current prohibitive rules on cell phones are merely fruitless efforts. Cell phones shouldRead MoreShould High School Students Be Allowed Cell Phones? School?1446 Words   |  6 PagesShould High School Students Be Allowed to Bring Cell Phones to School? By Ronnie Phillips | Submitted On July 07, 2011 Recommend Article Article Comments Print Article Share this article on Facebook 1 Share this article on Twitter 1 Share this article on Google+ Share this article on Linkedin Share this article on StumbleUpon Share this article on Delicious Share this article on Digg Share this article on Reddit Share this article on Pinterest 1 Expert Author Ronnie Phillips Educating youngRead MoreCell Phones Should Be Allowed While Driving – Agree or Disagree824 Words   |  4 PagesHistory and Government Ms. Thomas Cell Phones Should Be Allowed While Driving – Agree or Disagree In my opinion cell phones should not be allowed while driving. The reason in which I say this is because if you have your cell phone out while driving you can cause injury or death upon both you and/or another individual either in your car or another. While driving you are to pay full attention to the road and where you’re driving to and not the phone it is a distraction. For an example, OnRead MoreEssay on should students be allowed to use cell phones in school1043 Words   |  5 PagesPersuasive Essay / Cellular Telephone Cell Phones: Many American youth now have cell phones that they carry with them everywhere .Should cell phones be allowed at school ?Many teachers and students claim that phones are distracting while many parents and students insist that phones are necessary. Write a persuasive essay explaining your position on the issue. Although not everybody would agree, but I think that cell phones should not be allowed to bring to school. I have several reasons