Gun shooting problems Essay Example | Topics and Well Written Essays - 500 words

Gun shooting problems - Essay Example These laws vary widely and there is a need of promotions or campaigns to enhance public awareness. Following measures can be taken in order to prevent gun shooting at schools. There are many varieties of solutions each has different grades of expense and levels of security. These are designing of laws and policies to inhibit children from gaining access to guns, equipping all school entries, as well as all related rooms, with bulletproof doors within a school that automatically lock upon shutting, lower technology doors that should be opened only from the inside or from the outside with keys, introduction of jamblock, a portion of steel that can rapidly be protected under a classroom door, efficiently locking it and significantly reducing the movement of anyone determined on breaking in and Having metal sensors or .,detectors at the secure entry. 4. Social and cultural contexts: Crisis in youth culture educational institutions, especially public schools, Widespread availability and acceptance of guns, Drugs and medications, bullying, media and video games, areas with a strong conservative religious population Today in United States increasing gun violence in school and other areas of society become a serious national and social issue. The United States has been suffering from prevalent levels of gun violence yearly. There are greater than 100,000 Americans who become victims of gun violence every year according to US Centers for Disease Control and Prevention. Gun ownership is prevalent in United States and gun violence is rampant. Fatal school shootings at a widespread variety of schools have claimed over 400 undergraduates and faculty lives since columbine. In summer 2012, there have been may well publicized school shootings in America. On February 10, 2012 in Walpole, 14 year old students shoot himself in front of his fellow students. Former classmates opened fire on three students and kill them and injured six

The different forms of religious experience are nothing more than fantasy Essay Example for Free

The different forms of religious experience are nothing more than fantasy Essay Assess the view that the different forms of religious experience are nothing more than fantasy. (45) The term religious experience refers to an experience a person has which has religious qualities and significance. Many people have researched into the idea of religious experiences and it is surprising to find out that a third of people in Britain have said to of experienced some kind of religious experience. These experiences have been researched to discover what impact they have on peoples lives and whether this impact has a positive or negative result. Many scientists research the theory of religious experience to either prove or disprove the existence of God. There are four main forms of religious experience which can be considered when assessing this question that religious experiences are nothing more than fantasy. The first is Mysticism; this refers to an experience where people have had an intimate direct experience with God or some kind of heavenly spirit. William James was a philosopher who approached the idea of religious experiences he wrote a book called the varieties of religious experiences and came up with the idea that there are four main qualities that an experience should have for us to justify calling it mystical. The first is the experience should have a Noetic quality or a divine knowledge after the experience. The next is Transience the experience is only short and lasts only a small while. Passivity which is the lack of control you have when the person is having the religious experience. And the last quality is ineffability which is the fact that the experience is indescribable ands cannot be explained. Julian of Norwich was a famous English mystic who was born about 1342 and at some point during her adult life joined a religious order and became an anchoress living in complete solitude. She lived in a cell which was attached to a church in Norwich, and lived a complete ascetic lifestyle. Julian just before she died became seriously ill and on her deathbed she accounted for 16 visions she had experienced. These experiences are questioned though due to Julians poor health and cannot be used as proof for religious mystical experiences due to this reason. A second mystic is Margery Kemp she was 14th century English mystic who was from Kings Lynn in Norfolk. Margery Kemp became seriously ill after the birth of her first child and suffered from severe guilt from a past sin which had committed during her youth. She was very disturbed going to such lengths as biting through her own veins in her wrist and she also tried to jump out of a window, until one day she looked up to see Jesus and he asked her Daughter, why have you forsaken me when I never forsook thee? From then on Margery seemed to calm and she devoted her life to serving Christ. She had many experiences of Christ and each time Margery was overwhelmed and was seen to be crying. Margery went on many pilgrimages and even at one point was seen being chased by a mob from the shrine of St Thomas Becket after she was crying profusely. From these experiences of which many questions could be asked are very unreliable and couldnt be taken as proof for real religious experiences and meetings with a higher power. The next form of religious experience would be Conversion experiences. These are experiences which change a person and the direction in which there life is going. They transform a persons life and there attitude. A good example of this would be Nicky Cruz and his evangelical conversion experience. Cruz is the author of Run Baby Run which he wrote recalling his life as the leader of a notorious gang the Mau Maus. Cruz was raised by spiritualist parents in Puerto Rico. During his childhood he experienced severe physical and mental abuse. His parents took part in strange and disturbing practises such as when they sacrificed a goat and drank its blood. At a very young age Cruz tried to commit suicide and at 15 he was sent to live with his older brother in New York. This is where he met the gang members and eventually became the leader. Nicky committed many awful crimes and seemed unreachable and unredeemable; this was until he met a street preacher David Wilkerson who told him that Jesus loved him. This is when he experienced a dramatic conversion experience after a Christian meeting. After this he trained as a preacher and set up an outreach programme and teen challenge to help disadvantaged children. And he also managed to convert his parents to Christianity. Another conversion experience which was miraculous was the conversion of John Wesley who saw his conversion as a moment from academic acceptance to personal trust in Christ. At the young age of 6 he was almost killed in a great house fire at his home. From then on he decided to make religion his life and was ordained in 1725. At university he set up a group of people concerned with spiritual matters they nicknamed themselves the Methodists. Wesley became a missionary and travelled to Georgia to try and convert Indian settlers here. On the way back to England he was caught in a strong storm and he feared for his life until he noticed a group of Moravian Christians on board who were remaining calm because they felt so sure of there faith and they knew God would look out for them. And then at a Christian meeting he gained assurance that he was saved on that journey home form America. He stated that his heart felt strangely warmed and had accepted and now trusted Christ this again was an evangelical conversion experience. These are miraculous conversions and could lead to evidence of real religious experiences due to the amazing transformation both these people had, and in both cases the experience had a positive effect on there lives. Visions are also a type of religious experience. One of the most famous visions would be the visions which appeared to three young children. These children lived in Fatima Portugal. Lucia Santos was sent to live as a shepherdess she worked with her cousin Francisco and her 6 year old sister Jacinta. On the same hillside the children saw three visions these were called the three secrets of Fatima. The first vision was a vision of hell which was shown to the children as a great sea of fire with demons and souls in human form. The second secret that was predicted was that Russia would one day return to Christianity. And the last secret was a vision of a man dressed in white falling to the ground apparently dead. This is said to be the attempted assignation of Pope John Paul II. The vision was recalled and Lucia accounted exactly what happened to the pope just before he was shot at. The lady asked the children to do penance and make sacrifices to save sinners. The children wore tight ropes around there waists and deprived themselves of water and food. The lady who had appeared to them also asked them to pray the rosary everyday. The last and most incredible thing about the predictions of the lady was that she predicted the time and date of the death of two of the children. The lady had told them when and the exact hour the children would die and that they would be saved and be with her if they followed her instructions of praying the rosary and giving penance. One thing in which makes these visions different from all the other religious experiences is the fact thousands of people experienced one of the miracles brought by the lady. The children were asked to visit the lady on the 13th October and the news of the visions had become common knowledge therefore the children were followed by great crowds of people who wanted to experience a vision of the lady. At the site where the lady appeared to the children the sun began to dance in the sky and the whole crowd witnessed it. Many visions are recorded in the Bible such as Moses and the burning bush, which recalls the time God spoke to Moses via a burning bush and told him his plans for the Hebrews who had been enslaved in Egypt by the Pharaoh. These visions still have many unreliable qualities it could be said that they are more convincing than the previous religious experiences mentioned. This is because for these visions many of the predictions came true and were also seen by many others. The final form of religious experience is Revelation or divine self disclosure. Revelation can be defined as the communication of some truth by God to a rational creature. Hildegard of Bingen lived in Germany and from the age of eight she claimed that she felt God over shadowing her life. Hildegard recorded the visions she had experienced during her lifetime and she described the fact she felt she had had an insight from God about future events. From these findings of religious experiences, and the many different forms in which they can take, has aided me in answering the question about religious experiences being only fantasy. In many of these cases the individual has been in poor health and has had some kind of traumatic experience in there past. Although some of the explanations and descriptions of the religious experience have been very realistic especially those with more than one witness to them. Many of the experiences have been very miraculous and if they did occur, this could have been blamed on many factors such as ill health or poor diet, or even guilt and their mind was playing tricks on the person.

Photopolymers for Tissue Engineering Purposes

Photopolymers for Tissue Engineering Purposes DISCUSSSION   Ã‚  Ã‚   Tissue Engineering offers the potential to grow the cartilage in a precise shape and requires minimal operative time. In most of the preliminary studies, a prefabricated mold is used to grow the chondrocytes and obtain a tissue-engineered cartilage. However using the mold techniques is time consuming, does not provide an aesthetic framework for growing the cartilage and there is an uneven growth of cartilage tissue over the framework. 3D CAD manufacturing provides an alternative technique whereby one can accurately fabricate an ear shaped scaffold similar to the normal ear. Approach in scaffold design must be able to create porous structures to attain desired mechanical properties and to produce these structures within arbitrary and complex three-dimensional (3D) anatomical shapes. Material chemistry along with fabrication technique determines the properties that a scaffold can achieve and how cells interact with the scaffold .There are many techniques which are used in additive manufacturing like Stereolithography, Fused deposit modeling, selective laser sintering. Stereolithography exhibits the capability to control the spatial organization of multicellular material compositions with precise porous structures and defined shape according to patient obtained from any medical imaging modality data. In this study, we accomplished stereolithographic fabrication of hybrid scaffolds using visible light excitation by using a commercially available low cost 3D printer. The scaffolds fabricated as such will be suitable as a photo curable material that could offer an ideal environment suitable for cell growth and provide the mechanical support for the regenerative process. The table shows current studies that have made use of photo curable biomaterial that can be used for tissue engineering process.    Figure 6.1 Current studies involving photopolymers for tissue engineering purposes   Ã‚  Ã‚  Ã‚  Ã‚   As explained in the above table there are many studies, which use biodegradable polymers that can be fabricated using the stereolithography technique. However, in most of these studies there are no such combinations of natural and synthetic polymers. Also in many studies, the material has been cross-linked in the lab by using a light source or by a modified/custom made 3D printer. For this study, we decided to use a low cost and a commercially available 3D printer (Formlabs Form 1+) and natural and synthetic available polymers without making any modifications.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   PEG is one of the most commonly used synthetic photo polymers for tissue engineering applications. For photo polymerization process the end group of PEG are modified into methacrylates, di acrylates, fumarates,vinyl esters etc   and used for the polymerization. The reactivity of vinyl monomers towards free-radical chain polymerization follows this sequence: acrylate à ¢Ã¢â€š ¬Ã…  >à ¢Ã¢â€š ¬Ã…   vinyl ester ∠¼ vinyl carbonate à ¢Ã¢â€š ¬Ã…  >à ¢Ã¢â€š ¬Ã…   methacrylate à ¢Ã¢â€š ¬Ã…  >à ¢Ã¢â€š ¬Ã…   fumarate. Due to the high reactivity rate we have decided to make use of acrylated PEG. Acrylated PEG enables photo polymerization with variable mechanical properties, but by itself, PEG cannot provide an ideal environment for cell growth   despite having possessing properties like nontoxicity, low protein adhesion, and nonimmunogenicity. Also PEG does not possess the ability to degrade by itself.   Ã‚  Ã‚  Ã‚  Ã‚   When it comes to biocompatibility issues, natural polymers are generally thought to be advantageous over synthetic hydrogels since natural gels may offer biological property to surrounding cells. Most naturally-derived polymers are either components of natural ECM or provide similar properties that can mimic the ECM properties. One such natural, biocompatible,and biodegradable polymer used to generate hybrid hydrogels is chitosan, an N-deacetylated derivative of the polysaccharide chitin. Although there is a   study that shows the photopolymerization of oligomeric chitosan with PEGDA polymeric chitosan has not been successfully polymerized with PEGDA. Chitosan is structurally similar to glycosaminoglycans (GAGs) found in cartilage and is degradable by enzymes in humans. The objective of the study was to get a hybrid copolymer of Chitosan and PEGD which can be 3D printed by stereolithography.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   To create the resin we dissolved the chitosan in acetic acid.   The acetate anions deprotonate the primary amino groups of chitosan. So it became necessary to dialyze the chitosan solution in a strong basic group solution like a sodium acetate. Dialysis of chitosan solutions in sodium acetate partially neutralizes the protonated primary amino groups. Such partial de-protonation of chitosan enabled mixing of photo initiators for polymerization of PEGDA without quenching the radicals formed by protonated amino groups. Because of the high degree of crosslinking of short chain PEGDA, caused by a higher concentration diacrylate groups compared to long chain PEGDA a commercially available PEGDA 575 was used. In absence of   Chitosan the minimum concentration required to create the   printable resin was 30% (w/v) . However as shown in table the amount of   PEGDA using Chitosan was reduced from 30%   to   6-9 % . Once the printable formulation was obtained it was necessary to test the mechanical and cellular properties of these scaffolds. Schematic of cross linked hydrogel with mesh size and crosslinking distance When a hydrogel is kept in the solvent the solvent molecules try to enter inside by the capillary action. As more molecules enter the hydrogel the mesh size à ¯Ã‚ Ã‚ ¸ increases and more of the solvent is absorbed. However, the swelling is not a continuous process and when the capillary forces balances the elastic forces of the network the equilibrium is reached.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   à ¯Ã‚ Ã‚ ¸Ãƒ ¯Ã¢â€š ¬Ã‚  Ãƒ ¯Ã¢â€š ¬Ã‚ ½Ãƒ ¯Ã¢â€š ¬Ã‚  Q1/3 * (ÃŽ ³2)1/2 where Q =swelling ratio and  Ã‚  Ã‚   ÃŽ ³ = distance between two crosslinking points. As evident from the figure and the equation there is a direct relation between the swelling ratio and mesh size. As the amount of the PEGDA concentration increases, the degree of the crosslinking has increased. Highly cross-linked hydrogels will have a tighter structure, and will swell less compared to the same hydrogels with lower crosslinking ratios. Crosslinking hinders the mobility of the polymer chain and hence lowers the swelling ratio.   Ã‚   As evident from Fig the mechanical modulus of the hydrogel was inversely related to the swelling ratio. As the ratio of PEGDA increased from 5 to 15, the elastic modulus increased by approximately seven times in both LMWC and HMWC Chitosan. As the swelling ratio decreases the increased resistance of the hydrogel contributes to the increase in Youngs modulus. Diluted PEGDA, without chitosan, at 30% (w/v) had the highest stiffness with a compression modulus of 1125  ± 68.05 kPa (Mean  ± SD). It was observed that the gel was capable of recovering to its original length following even with a 50% strain deformation.It is evident that increasing the ratio of the initiator will increase the crosslinking density which will reduce the mesh size and in turn increase the modulus of the hydrogel.As evident from the swelling ratio the hybrid hydrogel had a higher swelling ratio than pure PEGDA which led to higher pore size which was proved with the SEM Imaging side

Macbeth :: essays research papers

A struggle is present in every tragedy, as a person tries to overcome their flaws and fit the mold of their ideal. William Shakespeare plainly defined a good man in the play "Macbeth". This goal by it's definition is a difficult one for any man to achieve. Prudence and logic, temperance and patients, as well as the vindication of honor are Shakespeare's defining characteristics of a good man.As with any well written tragedy, Macbeth's title character and hero had to fall from his place of greatness to see his faults and begin his agonizing climb back to his previous position. His position, that of a good man, was one that demanded respect in the beginning of "Macbeth". The Sergeant described Macbeth's honor and bravery to king Duncan in act I, scene 2."For brave Macbeth-well he deserves that name-Disdaining fortune, with his brandish'd steel,Which smoked with bloody execution,Like valour's minion carved out his passageTill he faced the slave;..."Macbeth defended his king's honor as well as his own, as Shakespeare showed a good man never backed down from a foe.In the later acts of the play, Shakespeare furthered the definition of a good man by portraying what a bad one was not. In Macbeth's darkest hours, he showed no sign of prudence and logic as he slayed king Duncan, and hired assassins to murder his friend Banquo. Macbeth displayed his temerity in act IV scene 1 saying,"...from this momentThe very firstlings of my heart shall beThe firstlings of my hand. And even now,To crown my thoughts with acts, be it thought and done;..."Macbeth was no longer the logical, thinking man whom many admired. He had become reckless, acting with only his passion and not his mind. The tragedy of the murders he brought on fair Scotland was a direct result of this violation of the criterion of a good man.The most apparent flaw, and perhaps the most tragic in Macbeth's character, is his lack of patients and temperance. These shortcomings haunted Macbeth, causing him to let his "overvaulting ambition" rush fate, and hasten his doom. Macbeth could not wait for an appointment to a position of more power. Instead, he murdered the king to take his place. Opting not to wait to see if Banquo would be loyal to him, Macbeth had his companion murdered. His impatience led Macbeth to listen to his wife, the witches, and his darker side. Macbeth :: essays research papers A struggle is present in every tragedy, as a person tries to overcome their flaws and fit the mold of their ideal. William Shakespeare plainly defined a good man in the play "Macbeth". This goal by it's definition is a difficult one for any man to achieve. Prudence and logic, temperance and patients, as well as the vindication of honor are Shakespeare's defining characteristics of a good man.As with any well written tragedy, Macbeth's title character and hero had to fall from his place of greatness to see his faults and begin his agonizing climb back to his previous position. His position, that of a good man, was one that demanded respect in the beginning of "Macbeth". The Sergeant described Macbeth's honor and bravery to king Duncan in act I, scene 2."For brave Macbeth-well he deserves that name-Disdaining fortune, with his brandish'd steel,Which smoked with bloody execution,Like valour's minion carved out his passageTill he faced the slave;..."Macbeth defended his king's honor as well as his own, as Shakespeare showed a good man never backed down from a foe.In the later acts of the play, Shakespeare furthered the definition of a good man by portraying what a bad one was not. In Macbeth's darkest hours, he showed no sign of prudence and logic as he slayed king Duncan, and hired assassins to murder his friend Banquo. Macbeth displayed his temerity in act IV scene 1 saying,"...from this momentThe very firstlings of my heart shall beThe firstlings of my hand. And even now,To crown my thoughts with acts, be it thought and done;..."Macbeth was no longer the logical, thinking man whom many admired. He had become reckless, acting with only his passion and not his mind. The tragedy of the murders he brought on fair Scotland was a direct result of this violation of the criterion of a good man.The most apparent flaw, and perhaps the most tragic in Macbeth's character, is his lack of patients and temperance. These shortcomings haunted Macbeth, causing him to let his "overvaulting ambition" rush fate, and hasten his doom. Macbeth could not wait for an appointment to a position of more power. Instead, he murdered the king to take his place. Opting not to wait to see if Banquo would be loyal to him, Macbeth had his companion murdered. His impatience led Macbeth to listen to his wife, the witches, and his darker side.

Simple Harmonic Motion

Physics Laboratory Report Simple Harmonic Motion: Determining the force constant Aim of experiment: The objective of this experiment is: 1. To study the simple harmonic motion of a mass-spring system 2. To estimate the force constant of a spring Principles involved: A horizontal or vertical mass-spring system can perform simple harmonic motion as shown below. If we know the period (T) of the motion and the mass (m), the force constant (k) of the spring can be determined. [pic] Consider pulling the mass of a horizontal mass-spring system to an extension x on a table, the mass subjected to a restoring force (F=-kx) stated by Hooke’s Law.If the mass is now released, it will move with acceleration (a) towards the equilibrium position. By Newton’s second law, the force (ma) acting on the mass is equal to the restoring force, i. e. ma = -kx a = -(k/m)x ————————-(1) As the movement continues, it performs a simple harmonic motion with angular velocity (? ) and has acceleration (a = -? 2x). By comparing it with equation (1), we have: ? = v(k/m) Thus, the period can be represented as follows: T = 2? /? T = 2? x v(m/k) T2 = (4? 2/k) m —————————(2)From the equation, it can be seen that the period of the simple harmonic motion is independent of the amplitude. As the result also applies to vertical mass-spring system, a vertical mass-spring system, which has a smaller frictional effects, is used in this experiment. Apparatus: Slotted mass (20g)x 9 Hanger (20g)x 1 Springx 1 Retort stand and clampx 1 Stop watchx 1 G-clampx 1 Procedure: 1. The apparatuses were set up as shown on the right. 2. No slotted mass was originally put into the hanger and it was set to oscillate in moderate amplitude. 3.The period (t1) for 20 complete oscillations was measured and recorded. 4. Step 3 was repeated to obtain another record (t2). 5. Steps 2 to 4 were repeated by adding one slotted mass to the hanger each time until all of the nine given masses have been used. 6. A graph of the square of the period (T2) against mass (m) was plotted. 7. A best-fitted line was drawn on the graph and its slope was measured. Precaution: 1. The oscillations of the spring were of moderate amplitudes to reduce errors. 2. The oscillations of the spring were carefully initiated so that the spring did not swing to ensure accurate results. . The spring used was carefully chosen that it could perform 20 oscillations with little decay in amplitude when the hanger was put on it, and it was not over-stretched when all the 9 slotted masses were put on it. This could ensure accurate and reliable results. 4. The experiment was carried out in a place with little air movement (wind), in order to reduce swinging of the spring during oscillations and errors of the experiment. 5. The spring was clamped tightly so that the spring did not slide during oscillation. It reduced ene rgy loss from the spring and ensured accurate results. . A G-clamp was used to attach the stand firmly on the bench.This reduced energy loss from the spring and ensured accurate results. Results |Hanger and slotted mass |20 periods / s |One period (T) |T2 / s2 | |(m) / kg | |/ s | | | |t1 |t2 |Mean | | | | |( ±0. 1s) |( ±0. s) |= (t1 + t2) / 2 | | | |0. 02 |5. 0 |5. 4 |5. 2 |0. 26 |0. 0676 | |0. 04 |6. 0 |6. 0 |6. 0 |0. 3 |0. 09 | |0. 06 |7. 0 |7. 0 |7. 0 |0. 35 |0. 1225 | |0. 08 |7. 8 |7. 8 |7. 8 |0. 9 |0. 1521 | |0. 10 |8. 6 |8. 6 |8. 6 |0. 43 |0. 1849 | |0. 12 |9. 4 |9. 5 |9. 45 |0. 4725 |0. 22325625 | |0. 14 |10. 1 |10. 1 |10. 1 |0. 505 |0. 255025 | |0. 16 |10. 5 |10. 4 |10. 45 |0. 5225 |0. 27300625 | |0. 8 |11. 1 |11. 3 |11. 2 |0. 56 |0. 3136 | |0. 20 |11. 9 |12. 0 |11. 95 |0. 5975 |0. 35700625 | Calculations and Interpretation of results [pic] From equation (2), the slope of the graph is equal to (4? 2/k), i. e. 1. 5968 = 4? 2/k k = 4? 2/1. 5968 ? 24. 723 Nm-1 ?The force c onstant of the spring is 24. 723 Nm-1. Sources of error 1. The spring swung during oscillations in the experiments. 2.As the amplitudes of oscillations were small, there was difficulty to determine whether an oscillation was completed. 3. Reaction time of observer was involved in time-taking. 4. Energy was lost from the oscillations of the spring to resonance of the spring. Order of Accuracy Absolute error in time-taking =  ±0. 1s |Hanger and slotted mass (m) / kg |20 periods / s |Relative error in time-taking | | |t1 |t2 | | | |( ±0. s) |( ±0. 1s) | | | | | |t1 |t2 | |0. 02 |5. 0 |5. 4 |2. 00% |1. 85% | |0. 04 |6. 0 |6. 0 |1. 67% |1. 67% | |0. 06 |7. 0 |7. 0 |1. 3% |1. 43% | |0. 08 |7. 8 |7. 8 |1. 28% |1. 28% | |0. 10 |8. 6 |8. 6 |1. 16% |1. 16% | |0. 12 |9. 4 |9. 5 |1. 06% |1. 05% | |0. 14 |10. 1 |10. 1 |0. 990% |0. 990% | |0. 6 |10. 5 |10. 4 |0. 952% |0. 962% | |0. 18 |11. 1 |11. 3 |0. 901% |0. 885% | |0. 20 |11. 9 |12. 0 |0. 840% |0. 833% | Improvement 1. The spring should be initiated to oscillate as vertical as possible to prevent swinging of the spring, which would cause energy loss from the spring and give inaccurate results. 2.Several observers could observe the oscillations of the spring and determine a more accurate and reliable result that whether the spring has completed an oscillation. 3. The time taken for oscillations should be taken by the same observer. This allows more reliable results as error-error cancellation of reaction time of the observer occurs. 4. The spring used should be made of a material that its resonance frequency is difficult to match. Discussion In this experiment, several assumptions were made. First, it is assumed that the spring used is weightless and resonance does not occur.Furthermore, it is assumed that no energy is lost from the spring to overcome the air resistance. Besides, it is assumed that no swinging of the spring occurs during the experiment. In addition, there were difficulties in carrying out the exper iment. For timing the oscillation, as the spring oscillates with moderate amplitude, it was hard to determine if a complete oscillation has been accomplished. Added to this, in drawing the best-fitted line, as all the points do not join to form a straight line, there was a little difficult encountered while drawing the line.Nevertheless, they were all solved. Several observers observed the oscillations of the spring and determined a more reliable result that whether the spring has completed an oscillation. For the best-fitted line, computer was employed to obtain a reliable graph. Conclusion The mass-spring system performs simple harmonic motion and the force constant of the spring used in this experiment is 24. 723 Nm-1. ———————– A graph of T2 against m Square of the period (T2) [pic] Simple Harmonic Motion Shanise Hawes 04/04/2012 Simple Harmonic Motion Lab Introduction: In this two part lab we sought out to demonstrate simple harmonic motion by observing the behavior of a spring. For the first part we needed to observe the motion or oscillation of a spring in order to find k, the spring constant; which is commonly described as how stiff the spring is. Using the equation Fs=-kx or, Fs=mg=kx; where Fs is the force of the spring, mg represents mass times gravity, and kx is the spring constant times the distance, we can mathematically isolate for the spring constant k.We can also graph the data collected and the slope of the line will reflect the spring constant. In the second part of the lab we used the equation T=2? mk, where T is the period of the spring. After calculating and graphing the data the x-intercept represented k, the spring constant. The spring constant is technically the measure of elasticity of the spring. Data: mass of weight | displacement| m (kg)| x (m)| 0. 1| 0. 12| 0 . 2| 0. 24| 0. 3 | 0. 36| 0. 4| 0. 48| 0. 5| 0. 60|We began the experiment by placing a helical spring on a clamp, creating a â€Å"spring system†. We then measured the distance from the bottom of the suspended spring to the floor. Next we placed a 100g weight on the bottom of the spring and then measured the displacement of the spring due to the weight . We repeated the procedure with 200g, 300g, 400g, and 500g weights. We then placed the recorded data for each trial into the equation Fs=mg=kx. For example: 300g weight mg=kx 0. 30kg9. 8ms2=k0. 36m 0. 30kg 9. 8ms20. 36m=k 8. 17kgs=kHere we graphed our collected data. The slope of the line verified that the spring constant is approximately 8. 17kgs. In the second part of the experiment we suspended a 100g weight from the bottom of the spring and pulled it very slightly in order to set the spring in motion. We then used a timer to time how long it took for the spring to make one complete oscillation. We repeated this for the 20 0g, 300g, 400g, and 500g weights. Next we divided the times by 30 in order to find the average period of oscillation. We then used the equation T2=4? mk to mathematically isolate and find k. Lastly we graphed our data in order to find the x-intercept which should represent the value of k. Data Collected: Derived Data: mass of weight | time of 30 osscillation | avg osscilation T| T2| | m (kg)| t (s)| t30 (s)| T2 s2| | 0. 10| 26. 35| 0. 88| 0. 77| | 0. 20| 33. 53| 1. 12| 1. 25| | 0. 30| 39. 34| 1. 31| 1. 72| | 0. 40| 44. 81| 1. 49| 2. 22| | 0. 50| 49. 78| 1. 66| 2. 76| | Going back to our equation T2=4? 2mk .We found the average period squared and the average mass and set the equation up as T2m=4? 2k. Since T2 is our change in y and m is our change in x, this also helped us to find the slope of our line. We got T2m equals approximately 4. 98s2kg. We now have 4. 98s2kg= 4? 2k. Rearranging we have k=4? 24. 98s2k= 7. 92N/m. Plotting the points and observing that the slope of our line is indeed approximately 4. 98 we see that the line does cross the x-axis at approximately 7. 92. Conclusion Prior to placing any additional weight onto our spring we measured the length of spring to be 0. 8m. So if we hooked an identical spring and an additional 200g the elongation of our total spring would be approximately 0. 8m; accounting for twice our spring and the . 24m the additional weight added. However, I believe the additional weight of the second spring would slightly elongate the initial spring; bringing it roughly over a meter. Since our spring elongation has almost tripled I believe that an effective spring constant would be triple that of what we found it to be initially, making a new spring constant of 24. 51kgs

Image of Society essays

Image of Society essays The influence of media in society has effects on various age groups. When newspapers, magazine, and flyers, were the only mass media in the old days, influence of media in society wasn ¡Ã‚ ¯t as prominent as present. The development of technology has a significant impact on the contemporary society. The most effective and fastest tactic to reach people ¡Ã‚ ¯s mind is through media images and programs today. Television, as a prominent approach to deliver message, has potential to generate both the positive and negative effects on society. Not all media through radios and televisions are harmful. However, exposure to violence, inappropriate sexuality and offensive language are very convincing; especially to the children and teenagers. The growth of media also opened door to different culture across the world, which not only disturbs the contemporary society, but strengthen human access to the open world. Recently, the Hip-Hop industry is shaping the trendiest teenagers in America with their powerful and significant market force. How is Hip-Hop culture reaching out to the all the teenagers in the United States? The answer is simple. It's through media that is delivered straight to the living rooms of every family and they are present all around the world. It was impossible to be effective as it is now without the media. The most Americans in the old days were not introduced to different cultures such as: African-American culture or Asian culture, because media was dominated by white communities in earlier centuries in America. It was not until later when other ethnic groups were showed on TV screens. Then they started to catch up with the cultures all over the world. This illustrates that media limits people ¡Ã‚ ¯s creativity and well as widen the gap between different cultures. It would have been difficult to represent hip-hop culture without power of media. Ever since, demand for television grew dramatically; more people now have bet...