Science‚ Medicine & Technology – Lecture 2 14th September‚ 2012 Global Warming – Paul Waithe * Differences between climate change & global warming: Global warming is the overall increase in the earth’s temperature. Climate change may be in either direction. For instance; more hurricanes‚ more wind etc. Comprehensive way at looking at weather patterns. * Climate change over the past century is directly linked to global warming. * Global warming could result in the world
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Advanced Placement Program AP® Physics B Practice Exam The questions contained in this AP® Physics B Practice Exam are written to the content specifications of AP Exams for this subject. Taking this practice exam should provide students with an idea of their general areas of strengths and weaknesses in preparing for the actual AP Exam. Because this AP Physics B Practice Exam has never been administered as an operational AP Exam‚ statistical data are not available for calculating potential
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Pineda‚ Carlitos Miguel Ponce M. January 9‚ 2013 AIT2A Natural Science 12 ATOM DEVELOPMENT WITH SCIENTISTS INVOLVED 400 B.C. - Democritus’ atomic theory posited that all matter is made up small indestructible units he called atoms. Democritus expanded the idea to state that matter was composed of small particles called "atoms" that could be divided no further. These atoms were all composed of the same primary matter with the only differences between them being their size‚ shape
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reaction starts to take place. This means that the reductant (cathode) releases electrons (particles that are negatively charged) into the positive ions which make them negative and the oxidant (anode) soaks up the electrons from the negative ions leaving them positive again. But it doesn’t stop there‚ the oxygen reacts with the iron creating iron oxide and the chlorine gas which was a negative ion gets its electrons which have a negative charge soaked up by the iron and so it is only left with its
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where it is introduced into the ionisation source. It is injected into a high vacuum thus extremely low pressure tube system where the particles in the substance are then ionised to positive ions when colliding with a beam of high speed electrons shot from an electron gun. However this material must be in a gaseous state to be analysed in the mass spectrometer and if not already a gas must be vaporised before the mass spectroscopy process can begin. The now ions are then accelerated down a tube using
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The development of MRI imaging technology is one useful spinoff of basic research into the structure of the atom. Research‚ however‚ is expensive. Many people argue that the high cost of research outweighs its potential benefits. Provide one argument for and one argument against increasing current funding for atomic-structure research. Use specific examples from this lesson in your answer to support each position. One argument against continuing research on the atom is that the cost continues
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temperature emits no electromagnetic fields and has zero electrical resistance. With this discovery and electrical current can now persist indefinitely when flowing through a loop of superconducting wire. On April 30th 1897 J.J. Thomson discovered the electron. He discovered this through his research on the properties of cathode rays. By measuring the amount of heat generated when the rays collided in a thermal junction and comparing this to the amount of magnetic deflection of the rays‚ he was able to
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Question 1(10 marks) Comment the following statements (a) The volume coefficient of thermal expansion of water is negative for temperatures in the range 0 to 4 °C. (b) The triple point of water‚ 0.01 °C‚ and 611.73 Pa‚ is one of the primary fixed points on the Kelvin absolute temperature scale. (c) The volume coefficient for the thermal expansion of a solid is twice the linear coefficient for thermal expansion. (d) A temperature of 26.85 °C is the same as 300 K. (e) The surface temperature
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NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2008 PHYSICAL SCIENCES: PAPER I Time: 3 hours PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 1. This paper consists of: • a question paper of 17 pages • a data and formula booklet of 3 pages (i – iii) Please make sure that your question paper is complete. 2. 3. 4. 5. 6. Remove the pages of data and formulae from the middle of this question paper. Use the data and formulae whenever necessary. Read the questions carefully. In Question 1 answer 1
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light reactions. b. The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle‚ and the cycle provides water and electrons to the
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