Tuesday, January 28, 2020

Ruler Dropping Test to Measure Reaction Time

Ruler Dropping Test to Measure Reaction Time Problem statement It takes every person a little time to react to any event. For example, there is a small delay before you try to catch a ball moving towards you or trying to catch a falling glass from a certain height. This time is called your reaction time. There are many ways that you can measure your response time. Some of the methods are very easy (without calculation). One of the simplest and common methods of calculating response time is the ruler drop test. Most of the athletes use this methods to calculate their response time. In our engineering physics class we were asked to use this method to calculate our reaction time. For this assignment we were to be in small groups and measure everyones reaction time by getting 10 measurements from each student and determine who has the fastest reaction time. After taking the initial measurements we were also tasked to calculate the errors of those measurements. Coming up with a plan to asses this we encountered some major problems such as, How fast is our reaction time? With each measurement does our reaction time increase? Why we tend to catch the ruler in the middle rather than the beginning? How to improve our reaction time? After we have done this assignment we plan to solve each one of those questions while providing the answers to our assignment. What is reaction time? In this method one of the students drops the ruler, the student see it starts to move and nerve signal travels from his eye to his brain. The brain simulates the signal and sends it to his finger muscles which move to catch the ruler. The whole process takes between 150 and 220 milliseconds. The process of catching the dropped ruler begins with the eye watching the ruler expecting of it falling. After the ruler is dropped, the eye sends a message to the visual cortex (which simulates what we see), which perceives that the ruler has dropped and its falling. Then the visual cortex sends a message to the motor cortex (nerve stimulation) to start the process of catching the ruler. The motor cortex sends a message to the spinal cord, which sends a message to the muscle in the hand/fingers. The final process is the process that makes a muscle to become tighter of the muscles as the hand grasps the ruler. All of these processes involve individual neurons that transmit electrochemical messages to other neurons. How to proceed the test. What do we need? An accurate ruler. Two people(one to release the ruler and one to catch it) How to proceed. When we do this test one person has to hold the ruler and release that ruler at an unpredictable time. When the ruler start to fall (the test) the other person (test subject) has to pinch his fingers together catching it. This is his reaction to the falling ruler. The distance that we take (to measure) is the distance between the bottom of the ruler and the top of the thumb where the ruler has been caught. It is very unlikely that a student can stop the ruler at the same distance twice in a row. That means that we can get a more accurate measure of that students reaction time. We are conducting this experiment several times and take an average of our results. For this assignment we take 10 measurements from each student. How to calculate. To calculate ones reaction time we use the 3rd kinematic equation, 1 s= displacement. u= initial velocity. t=time taken. a=average acceleration. Proving, To prove the 1st equation, 2 We know that the first kinematic equation is, Applying this to the 2nd equation, How to use this to calculate reaction time Because the ruler is dropped down, Calculation To calculate the reaction time for each person we took 10 measurements from each person to get an accurate value. To get the most accurate value we calculated the mean of each person. Down below are the measurements we got. Every value is on cm scale. As proven above we are going to use two equations to calculate each ones reaction time and determine who has the fastest reaction time. 1 2 Looking at the results we found, we can see there are four people with a reaction time of 0.165s. This brings the idea of errors in this calculation and method.   What can be the errors in this measuring method? Thought processing speed is different in each individual. As I explained above when I was describing reaction time to catch the ruler the test subjects muscle has to work. Depending on the thought processing speed it varies. Because we are taking average metes of each person you can see all the averages are on the same range. That means even if one person went too far with the meters he can catch up with others with fast reaction time. Other thing is because the measuring system is analogue, people can make mistakes such as the person who is dropping the ruler is not consistent with his work (dropping the ruler). That can lead to errors. Conclusion Ruler dropping test can be the easiest way of measuring reaction time but it has its own pros and cons. This method requires very minimal amount of items to conduct the test. This method also not require a specialized pace to conduct the test and can be easily set up for the test. However there are few disadvantages as well such as this requires at least one assistant to support the test subject. Also because its simple it can be incorrect when it comes to the calculations as we can see above. In our given assignment we were to find a way to measure the reaction time using the ruler drop test. This leaves us with only one question, is it reliable to measure our reaction time with this method? REFERENCES [1]B. Mackenzie, Ruler Drop Test, Brianmac.co.uk, 2017. [Online]. Available: https://www.brianmac.co.uk/rulerdrop.htm. [Accessed: 22- Mar- 2017]. [2]File:REACTION.DOC, Physics.nmsu.edu, 2017. [Online]. Available: http://physics.nmsu.edu/research/lab110g/html/AREACTION.html. [Accessed: 22- Mar- 2017].

Monday, January 20, 2020

Brian Wilson :: Biographies Music Papers

Brian Wilson I can remember when I was a little girl, my father and I would listen to Beach Boys’ albums together in our living room. My favorite song was Kokomo and I would sing it all the time. I loved the cheerful sounds of the music and the fun loving attitude that The Beach Boys portrayed. As I grew older, I still loved The Beach Boys, and I continued to listen to their music frequently. The more I learned about music the more amazing their music seemed. The tight harmonies and unique instruments made each song unique and made me more and more interested in finding out how they were created. Brian Wilson is the creative genius that wrote and produced much of The Beach Boys’ music. Despite being near deaf in one ear, Wilson managed to not only provide the Beach Boys with countless hit records, but also made a major impact on popular music as a whole. His music influenced most major pop musicians today and his harmonies are used in songs sung by such pop acts as N’Sync and The Backstreet Boys. Even the Beatles admit that they felt threatened by the Beach Boys and without the creative challenge that Brian Wilson posed, both Revolver and Sgt. Pepper’s Lonely Hearts Club Band would have never come into being. Born in Inglewood, California, June 10, 1942, Brian was the first child of Murry, who was an aspiring songwriter, and Audree Wilson, a talented pianist. Brian’s life was always full of music. Brian Wilson said in his biography Wouldn’t It Be Nice, â€Å"As far as I can remember, I have always heard music, faint strains of melody floating in my head...I was able to tune into a mysterious, god-given music. It was my gift.† However, Brian did not have a happy childhood. His father both physically and emotionally abused Brian, Brian’s mother, and later, Brian’s two younger brothers, Dennis and Carl. His mother turned to alcoholism to escape from the abuse. Also, because she was afraid of Murry, Audree rarely showed her boys physical affection.

Sunday, January 12, 2020

Quani’s Story

Family Genealogy Paper A family that prays together stays together is an idiom passed down from generations to generations. My family stands firm on this phrase and will continue to pass it down to generations to come. As I conducted a few conversations with family members, from the maternal side of my family, I understood why they believed in the quote and I will continue to pass it down to my kids and family. The reason I researched my mother's side of the family was because they are arger than my father's side and they are in close proximity of each other.My mom's side of the family grew up in a small North Carolinian town called Pinetop. I went back as far as my great-great grandparents and their names were Edward and Rachael Crummedy. They were sharecroppers and they both passed away when my great-grandmother was 9 years old. My great-grandparents are the late Columbus and Clara Crummedy Dickens. Born in 1913, Columbus Dickens grew up to be a sharecropper and provider for his fa mily. Columbus worked for a white man who wned the property that the Dickens family resided on.He would work on the farm all year long Just so that the family could stay on the farm and also have food to eat. His return pay would be a stipend at the end of the year that went towards the bills for the house, so he never really saw any money for his own good. During certain times of the year he had to hire other people to help him maintain the farm (who were usually family members) and they would receive their pay from whatever Columbus received. If Colu

Saturday, January 4, 2020

Racial Tension At San Jose State University - 1159 Words

Race is known to be a group of people sharing the same culture, ethnicity, language, and history. Ethnicity is considered to be the fact or state of being categorized in a group that shares a common nature or cultural traditions. Being a part of a family that is very diverse having a total of eight immediate family members. My father and two brothers all being Caucasian, my mother and oldest brother are African American, and my littlest brothers and I are biracial. We don’t view each other any differently than brothers. Meeting new friends or family, it’s never been an issue for us. As we got older we began to see it more and more with relationships, sporting activities, also stereotyping African Americans with one another and Caucasian†¦show more content†¦When the victim spoke up against the boys they began to call him, â€Å"fraction†. They chained a bike lock around the victim’s neck, and barracked him in his room. The harassment lasted for th ree months. This story caused a lot of tension to the campus, and many would say that it caused some people to look at other ethnicities a certain way. You wouldn’t think there would be as much of employment discrimination as what is actually reported. â€Å"The most general usage of employment discrimination in the United States is racial discrimination.† (â€Å"The 2011 Statistics of Workplace Discrimination Based on Race†). According to the information provided by the US Equal Employment Opportunity Commission, in 2011. The organization received a total of 35,395 complaints nationwide. â€Å"The number of complaints in 2011 is somewhat higher than that of 2010 which was (35,890).† (â€Å"The 2011 Statistics of Workplace Discrimination Based on Race†). With these numbers, it safe to say that despite the efforts of the federal and state governments to eliminate workplace discrimination, though some employers will still find ways to practice dish onest customs. Workplace discrimination based on a person’s race or color is against the Title VII of the Civil Rights Act. Under this law, it is known that employers with 15 or more workers are banned from discriminating against individuals based on their race or color, national origin, religion and religious practice, and sex. In Iowa, a supreme court