Essay On Christopher Columbus - 1530 Words

Hinga, Dinga, Durgen! (Spongebob) We were taught in school the saying, In 1492 Columbus sailed the ocean blue, to help us remember when Christopher Columbus discovered America. We learned the Spanish monarchy funded him and he set sail on the Nina, the Pinta, and the Santa Maria in hopes of finding a route to the riches that were in the west indies. He landed on an island, and this was how what we know as America was discovered and referenced as the New World. We even have a day set aside here in the United States to celebrate his accomplishment. It is difficult to believe that growing up we were taught history that was so inaccurate. Who was first to come to what we now call the Americas? There are many theories from the†¦show more content†¦He struggled to get funding and supplies needed to explore this theory, and after much rejection, the King and Queen of Spain agreed to sponsor his journey. On August 3, 1492, he sailed from Spain, and on October 12 they finally spott ed land. In a letter he wrote to King Ferdinand and Queen Isabella of his first voyage, he had reached the Indian sea and discovered many populated islands that he took possession of without resistance, in the name of the King and Queen of Spain. He named the first island San Salvador (Major 2). The natives that lived there greeted him and his crew and offered them gifts. He sent out two of his men to explore the island and to gather information of the natives that were living there. They discovered it was a massive population. In the meantime, Columbus seized some Indians and learned from them that they were on an island (Major 4). He also found that the people that were inhabiting the island were simple, honest, and kind. They would offer up any of their possessions (Major 7). Columbus also mentioned in his letter that he had taken some Indians by force from, the first island...in order that they might learn our language, and communicate to us what they knew respecting the country (Major 9). Bartolome de las Casa was an explorer that traveled with Columbus on his second journey and later became a priest. He noted in his writings of The Short AccountShow MoreRelatedEssay on Christopher Columbus? Or Not Christopher Columbus?1329 Words   |  6 Pages On Columbus Day students across the nation will learn how Columbus discovered the New World and about his fantastic travels to the New World. Children will learn poems, stories, songs and rhymes about his travels and about himself as well on this day. When introduced to Columbus as a young student he is portrayed as a respectful gentleman and as a hero, when in reality he is a selfish man who takes advantage of lesser people and schools should be teaching their students about who Columbus reallyRead MoreEssay on Christopher Columbus1614 Words   |  7 PagesChristopher Columbus Although nearly every phase of any exploration had its good and bad outcomes the benefits of Columbus discovery of the New World far outweigh the negative results of that enterprise; because his discovery stimulated further development of both Europe and the New World. His voyage was an epochal and magnificent discovery in that it confirmed the roundness of the earth and gave new validity to science, expanded trade and opened new markets and led to the industrializationRead MoreChristopher Columbus Essay1097 Words   |  5 PagesChristopher Columbus was born in 1451 at Genoa. Genoa was a seaport that was on the Ligurian sea. His name was Cristoforo Colombo and that was translated into English as Christopher Columbus. Christopher Columbus had two brothers, which he was older than both. Christopher Columbus had little schooling just like most of the people during that age. Genoa was a busy seaport and Christopher Columbus learned much from the sailors. Christopher Columbus’s f ather was a poor weaver. Christopher Columbus workedRead More Christopher Columbus Essay474 Words   |  2 Pagesin search of a direct sea route from Europe to Asia, Christopher Columbus accidentally discovered the Americas. However, in four separate voyages to the Caribbean from 1492 to 1504, he remained convinced that he had found the lands that Marco Polo reached in his overland travels to China at the end of the 13th century. To Columbus it was only a matter of time before a passage was found through the Caribbean islands to the cities of Asia. Columbus was not the first European to reach the Americas VikingsRead MoreEssay on Christopher Columbus1931 Words   |  8 Pagesdeeply held, yet imperfectly understood, beliefs. The role of history in the iconography of the United States is pervasive, yet the facts behind the fiction are somehow lost in an amorphous haze of patriotism and perceived national identity. Christopher Columbus, as a hero and symbol of the first order in America, is an important figure in this pantheon of American myth. His status, not unlike most American icons, is representative not of his own accomplishments, but the self-perception of the societyRead MoreEssay on Christopher Columbus539 Words   |  3 PagesIn 1492 Columbus sailed the ocean blue. But should America really celebrate Christopher Columbus? Was he really responsible for finding America or was he just simply lucky? The real question is, should the American people praise a man who had killed many innocent people? Though Columbus Day is ce lebrated no one really knows for what reasons. Most Americans just enjoy their day off. Would they celebrate Columbus Day if they really knew the facts? Christopher Columbus was an explorer funded byRead MoreChristopher Columbus Essay1310 Words   |  6 PagesChristopher Columbus set out on his voyage in 1942 on the West Indian islands, to find a new world for the Europeans. When he landed on the Caribbean Island the Indian Natives that lived there were at first scared but greeted him in a friendly manner. The conquest and settlement of the Western Hemisphere opened new opportunities for other Europeans such as the French, Dutch, English and Spanish to come to the island and colonize the Indians land. For the Europeans to colonize and move in on NativeRead More Christopher Columbus Essay548 Words   |  3 PagesChristopher Columbus was born in Genoa, Italy in 1451. He was named Christofero Columbo, after the patron saint. His father was Donenico Columbo, a weaver and wool dealer. Columbus had two brothers, Diego and Bartolome. Historians are certain that Columbus was not a noble. Columbuss crew on the first voyage were not a bunch of cutthroats. They were mostly hometown boys from Andalusia, and nearly all experienced seamen. Of the four voyages of Columbus, only the crew of the first voyage is completelyRead More Christopher Columbus Essay875 Words   |  4 PagesChristopher Columbus is a very important person in our countrys history. He found the New World, the one we live in today. He started the society that makes us who we are today, the society that allowed our ancestors to come to America and start the life that we live now. This whole world owes their lives to him. Columbus should always be remembered as a very important and very good person in history. Columbus made an especially daring trip when he set sail for the Indies. He knew he was headedRead More Christopher Columbus Essay808 Words   |  4 Pages The skills and qualities required of Christopher Columbus in order for him to lead a safe and successful voyage to undiscovered and unexplored lands weighed heavily on him, as he was initially placed in a headship position in the course of the planning of the journey because he originated and entertained the idea of finding a passage to China through unmarked waters. With his assiduousness and persistence, his appeal and intelligence, he was able to convince the King and Queen of Spain to fund

Final Descriptive Writing Free Essays

Anton Meriwether When you are trying to write a descriptive piece then it is best to describe everything in a very visual way to that would make the reader use it’s five senses. Using the five senses in a descriptive writing really elevates your piece and makes it stand out. I’m from a small city in northern Indiana where not many people visit even actually hardly at all. We will write a custom essay sample on Final Descriptive Writing or any similar topic only for you Order Now The city is off the coast of Lake Michigan which creates a slight cold breeze in middle of December and all of January. The city is called Michigan City, Indiana. Have you ever heard of The Blue Chip Casino? Of course you have I mean who haven’t. The Blue Chip Casino is like a boat casino and it is also the tallest building in the whole city. The Casino sits at one end Of Michigan Blvd which is one of the main roads in the city and also one of the longest. Another thing about the city is a place called The Dunes. The Dunes is a big sand hill that depending on the weather will burn your feet. The Dunes is a great place to go if you’re looking to have some fun walking n sand and also going to the beach. Hearing the beach at night just calms you down no matter what is going on because, hearing the breeze flow over the lake creates a sound that can’t be mimicked by technology which is very rare nowadays. Michigan City is a good place to visit but of course every city has its down falls I mean Atlanta is too big like huge for no reason at all, no seriously, really dumb big and parking is expensive and can’t even drive yet and I’m saying, it’s just ridiculous, but back to the task at hand. One problem about Michigan City is the weather, if you are not used to cold weather or don’t like it then it’s not your place because it gets freezing, iceman, Antarctica, I’m staying inside the house cold. That is a descriptive writing that includes all five senses. When you use all the senses then you are truly writing a descriptive writing, because how can you describe something without using the senses, I mean, you not even describing anything all you are doing is just talking about it and that won’t get my attention. I hope this helps you become a better descriptive writer. How to cite Final Descriptive Writing, Essays

Magnetic Field and Cathode Ray Tube Essay Example For Students

Magnetic Field and Cathode Ray Tube Essay Experiment 4 Measurement of e by Thomsons bar magnet method. m Apparatus: Cathode ray tube (CRT) with power supply unit, one pair of bar magnets, high resistance voltmeter, magnetometer, stopwatch. Purpose of experiment: ? e? To measure the specific charge, i. e. charge to mass ratio ? ? , of an electron using ? m? Thomsons bar magnet method. Basic methodology: Electrons in a CRT are deflected in the vertical direction by applying a potential between the vertical deflection plates of the CRT. A magnetic field perpendicular to the deflecting electric field is produced using a pair of bar magnets. The position of the magnets is adjusted so as to cancel the deflection of the electrons. The knowledge of the deflecting potential and the magnet field of the bar magnets leads to a calculation of the specific charge. I. Introduction We have learnt that the electron has a negative charge whose magnitude e equals 1. 6 ? 10? 19 Coulomb and mass (m) equal to 9. 1 ? 10 ? 31 Kg. Millikans Oil Drop method enables us to measure the electron charge but the mass of the electron can not be measured directly. It is calculated by measuring the value of e/m. The aim of this experiment is to determine value of e/m by Thomsons method. This involves the motion of an electron in a cathode ray tube (CRT). A simplified form of a cathode ray tube is shown in Fig. 1. The electrons are emitted from the cathode and accelerated towards the anode by an electric field. A hole in the accelerating anode allows the electrons to pass out of the electron gun and between the two sets of deflection plates. The metallic coating inside the tube shields the right end free of external electric fields and conducts away the electrons after they strike the fluorescent screen where they form a luminous spot. Plates for Plates for vertical Focusing Anode horizontal deflection Accelerating deflection Anode Control Grid Electron Beam Metallic Coating Fluorescent Screen Heater Cathode Electron Gun Fig. 1 I. 2 This experiments can be divided into the two followings parts: 1. 2. The electric field (E) is applied alone. This produces a deflection of the electron beam. A magnetic is simultaneously applied along with the electric field so the deflection produced by the electric field is exactly counter-balanced by that produced by the magnetic field. As a result the spot made by the electron on the fluorescent screen returns back to the central position. Fig. 2 Fig. 2 Let us consider an electron moving in the direction of magnetic meridian (say x. -axis) with a velocity v0 m/s after passing through the accelerating anode. Under the action of the electrostatic field E = V/s (s being the vertical distance between the plates VV and V the deflecting voltage) each electron, as it passes between the plates, is acted upon by a perpendicular force eE. As a result the electron moves along a parabolic path AB (Fig. 2). The equation of motion is ? d2y? m? 2 ? = eE , ? dt ? ? ? which, upon integrating once with respect to time, gives (1) dy ? v0 ? ? = (eE / m )t ? dx ? (2) where v0 = dx/dt is the constant horizontal velocity. Here we also used the initial condition dy/dx = 0 at point A and time t=0. At any point distant x (=v0t) from point A in the field between the plates VV, eq. (2) gives dy ? eE ? ?x =? dx ? mv0 2 ? ? ? (3) On leaving the electrostatic field at point B (i. e. x=a), the electron moves along the tangential path BC with its velo city making an angle ? with the horizontal. Clearly, ? dy ? tan? = tan FBC = ? ? = ? dx ? at po int B ? eE ? ? ? ? mv 2 ? a ? 0 ? = tangent to the curve AB at point B (4) The electron finally strikes the screen at the point C (Fig. 2). The total vertical deflection of the electron y = CF + FO. Now CF = BF tan ? = L tan ? = eEaL . 2 mv0 (5) On the other hand, by eq. (3), we have ? eEx ? eEa 2 ? dx = BD = ? dy = ? ? ? mv 2 ? 2 mv02 ? 0 ? (6) Therefore the total displacement (y) in the spot position on the screen S due the application of electric field between the plates VV is y = CF + F O = CF +BD y= Thus eEa ? a ? + L? 2 ? mv0 ? 2 ? (7) e = m 2 v0 y ? a ? Ea? + L ? 2 ? ? (8) Hence, if the velocity of electron along the X-axis (v0) is known, the value of e/m can be calculated. I. 3 Let B be the magnetic field produced by the two bar magnets placed symmetrically on either side of the cathode ray tube at a distance d from it. The magnetic field of the bar magnets will be in the east-west direction. The magnetic force on the electron is given by F = ? e v ? B . This sets up a force Bev0 on the moving electron along the y direction. As a result, the electrons path becomes circular, with radius of curvature r given by 2 mv0 = Bev0 . r ( ) (9) When the forces on the electron beam due to electric and magnetic field are equal and opposite, the electron beam will be undeflected. Discrimination Everywhere! EssayReverse the deflection voltage and (with magnets removed) note the deflection of the spot. Place the magnets on the scale and find the value of d for which the spot returns to its initial position. Repeat the above steps for three different spot positions (Note: The deflection voltage should not exceed 375 Volts) PART B: Determination of time period of oscillation of magnetometer needle Align the wooden arm on which the magnetometer is placed along the magnetic meridian and place the magnets along the scales in the EW direction at the same distance d as in Part A. Note the equilibrium deflection ? 0. With a third magnet, slightly disturb the needle from its equilibrium position and measure the time period of oscillations T. Now remove the magnets and let the needle come to equilibrium at 00 – 0 0 position. Disturb the needle about this equilibrium position and measure the time period T0 of the oscillations. 1. 2. 3. 4. 5. 1. 2. 3. 4. Precautions: The cathode ray tube should be accurately placed with its longitudinal axis in the magnetic meridian. The spot on the screen should not be allowed to remain at a given position on the screen for a long time. There should not be any other disturbing magnetic field near the apparatus. While taking the observations for time periods, the maximum angular displacement of the magnetic needle should not exceed 40-50 degrees. Exercises and Viva Questions. Study the working of a CRT. What is the a typical value of accelerating voltage used in a CRT ? Estimate the velocity v0 of the electron. What will happen to the spot if a sounsidally time varying voltage is applied to the deflecting plates VV or HH? What will happen if such a voltage (of the same frequency) is applied simultaneously to the horizontal and vertical deflection plates? Draw a neat diagram showing the 3-dimensional orientations of vectors of the electrons horizontal velocity, the electric field, the magnetic field, the electric force on the electron and magnetic force as the electron moves in the CRT. Orient your diagram according to the experimental set-up. If the deflecting voltage is switched off but the bar magnets kept in place, will there be a deflection of the spot? Describe qualitatively the motion of the electron in the CRT from aperture to screen. III. 1. 2. 3. 4. 5. 6. 7. Describe the motion of the electron in the CRT in the presence of the deflecting voltage magnetic fields of the magnets. What is the effect of the Earths magnetic field on the electron motion? What would happen if the apparatus were rotated by 90 ° so that the CRT is along the E-W direction. Consider a dipole  µ aligned with a magnetic field. If the dipole is given a small angular displacement, then it experiences a restoring torque ? =  µBsin? where ? is the angle between the dipole and magnetic field. Considering small displacements ? , show that  µB the dipole will oscillate about the equilibrium with angular frequency , I being its I moment of inertia. Recalculate the integral I (eq. 12)) assuming that the magnetic field of the magnet is a constant B = Bm. Use this to recalculate the specific charge e/m. Does our approximate evaluation of I improve the evaluation of e/m? What are the sources of error in this experiment? How does your result compare with the e/m measurement by Thomson’s method? Which experiment is more accurate? 1. 2. â€Å"Advanced Practical Physics for Studentsâ₠¬ , B. L. Worsnop and H. T. Flint, Metheun London, 1942. â€Å"Physics†, M. Alonso and E. J. Finn, Addison Wesley, 1992. 8. 9. 10. References: Experiment 4: Measurement of e by Thomsons bar magnet method m Observations and Results Observations: Constant values: Length of plate, a = 2 cm Distance to screen from plate, L = 16. 0 cm Distance between the plates, S = 0. 4 cm Horizontal component of Earths magnetic fields BE = 3. 53 ? 10? 5 T. PART A: Measurement of deflection y: Initial position of spot, y0 = _____________ cm (specify +ve or –ve). Table 1 Displaced position of spot y1 (cm) Direct Reverse Displacement of spot y = y 1? y0 Direct Reverse Position of magnet d (cm) Direct Reverse Applied Voltage V (volts) Mean displacement y (cm) Mean d (cm) PART B: Determination of Time period Table 2 No. of oscillations = _______________ With Magnets Without Magnets S. No Total time T0 d =_____cm d =_____cm d =_____cm ?0 = ____deg Total time T ?0 = ____deg Total time T ?0 = ____deg Total Time T 1 2 3 Mean T0 Mean T All time measurements are in seconds Calculations  §a  · ? + L ? a Vy e  ©2 ? = m SI 2 Displacement d(cm) Bm = T BE sin ? 0 T 2 0 2 2 I = Bm ? d d 2 + Lo ? d 2 ?  «  »  ¬ ? Results: Calculated value of specific charge of electron Standard value of e = _____________ C/kg. 1. 759X1011 m e = ___________ C/kg. m % error in e = ___________________ m