Physics - 4366 Words

1 aky a A glass fibre of length 0.24 m and area of cross-section 7.9 Ãâ€" 10–7 m2 is tested until it breaks. The variation with load F of the extension x of the fibre is shown in Fig. 4.1. 4 x / 10–4 m nd ra Sh 3 ha 2 0 40 20 yS 0 aji tC 1 60 80 F/N db Fig. 4.1 rra ng e (a) State whether glass is ductile, brittle or polymeric. ......................................................................................................................................[1] (b) Use Fig. 4.1 to determine, for this sample of glass, the ultimate tensile stress, ultimate tensile stress = ........................................... Pa [2] mp ile da nd rea (i) Co 1†¦show more content†¦2.2. aji tC 4 compression / cm db yS 3 rra ng e 2 0 10 da nd 0 rea 1 20 30 40 weight / N Fig. 2.2 The elastic limit of the spring has not been exceeded. Determine the spring constant k of the spring. mp ile (a) (i) Co 3 k = ........................................... N m–1 [2]  © UCLES 2008 9702/02/M/J/08 For Examiner’s Use 6 Deduce that the strain energy stored in the spring is 0.49 J for a compression of 3.5 cm. nd ra Sh aky a (ii) [2] aji tC thread spring trolley mass 2400g db yS trolley mass 800g ha (b) Two trolleys, of masses 800 g and 2400 g, are free to move on a horizontal table. The spring in (a) is placed between the trolleys and the trolleys are tied together using thread so that the compression of the spring is 3.5 cm, as shown in Fig. 2.3. rra ng e Fig. 2.3 Initially, the trolleys are not moving. The thread is then cut and the trolleys move apart. (i) Deduce that the ratio mp ile da nd is equal to 3.0. rea speed of trolley of mass 800 g speed of trolley of mass 2400 g Co [2]  © UCLES 2008 9702/02/M/J/08 For Examiner’s Use 7 Use the answers in (a)(ii) and (b)(i) to calculate the speed of the trolley of mass 800 g. nd ra Sh aky a (ii) Co mp ile da nd rea rra ng e db yS aji tC ha speed =Show MoreRelatedPhysics And Physics Of Molecular Levels1109 Words   |  5 Pagesconsider interaction within a molecule, which had three bodies at least, in terms of quantum and relativistic laws. Facing the fascinating, but, daunting goal, I would have to take step by step to find a practical path. Even I had taken theoretical physics courses and was familiar with special relativity, I did not know much about micro-scale theoretical work. â€Å"Define a problem is the first step for any project. If you are able to define the problem precisely, you are a half way to solve it,† professorRead More Physics in Sports Essay1462 Words   |  6 PagesPhysics in Sports nbsp;nbsp;nbsp;nbsp;nbsp;When many people think of sports, the topic of physics doesnt always come to mind. They usually dont think about connecting athletics with academics. In reality math, science, and especially physics, tie into every aspect of sports. Sports are a commonality that brings nations together, Soccer, known as football to most of the world, is said to an unspoken language, which unties people from different lands through a passion to play a game. AthleticsRead MoreThe History of Physics Essay1534 Words   |  7 PagesThe History of Physics In order to attempt to trace the origins of the modern science that we now refer to as â€Å"physics,† we must begin with the origin of the term itself. 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In this book, Kaku represents physics in various ways so that the reader understands the significance of physics and implement in his/herRead MorePhysics by Aristotle Essay547 Words   |  3 PagesPhysics by Aristotle Aristotle begins by describing the meaning of the words â€Å"nature† and â€Å"natural.† He identifies the meaning of each, and also explains some common phrases which include each of the words. He says all natural things have a principle of motion and of stationariness. He also says that natural things are composed of stone, earth, or a mixture of the two. According to him, artificial products do not possess the source of their own production. For example, the natureRead MoreThe Physics Of Albert Einstein1284 Words   |  6 Pageswould also think that one who drops out of high school may not go anywhere in life. Einstein won a Nobel Prize in Physics, a Gold Medal of The Royal Astronomical Society, and many other awards. Even if Einstein never even finished high school, his creation of the equation E = mc2, theory of relativity, and theory of light led the way to him becoming known as the father of modern physics. Albert Einstein was Born in Ulm, Wà ¼rttemberg, Germany in 1879. He was the son of Hermann Einstein, a salesman andRead MoreReflection On Physics1032 Words   |  5 Pageshave always loved physics. I didn’t. In fact, I hated physics in the 9th and 10th grades, not because I didn’t like doing science or was bad at mathematics, but because I was unable to understand the equations, that appeared to come from nowhere. According to my physics teacher, both of the equations for a vertically thrown ball y = 1/2gt 2 + v 0 t and y = −1/2gt 2 + v 0 t were correct, which didn’t make much sense to me because the signs were different! However, my view on physics changed dramaticallyRead MoreEssay on A Century of Physics3573 Words   |  15 PagesA Century of Physics By the end of the nineteenth century after more than two thousand years of intellectual struggle that began with the Greek philosophers, physical scientists had reason to believe that they were beginning to understand the universe. Their theories of matter and energy, of electricity and magnetism, of heat and sound and light were confirmed in laboratories throughout the world with increasing precision. Experimentation was the method and mathematics the language of aRead MorePhysics Of String Theory Of Physics1543 Words   |  7 Pagesnumber of excitation modes - that are the elementary particles observed. the strings have tension of 1/(2 p a’) strings are approximately the planck length (smallest possible size of black hole) 10^(-33) cm A quantum Theory of Gravity is needed In physics there are two main central theories. The first is Einstein’s theories of relativity. The second is quantum mechanics. Einstein’s theories of relativity describe gravity but does not include quantum effects. Quantum mechanics describes the universeRead MoreEssay about Physics in Cartoons555 Words   |  3 PagesPhysics in Cartoons The cartoon that was analyzed by our group was the Disney movie The Emperors New Groove. This movie is very entertaining and comical, however when a closer look is taken at the use (or lack thereof) of Physics Laws, many errors can be found. The following are four examples of situations in The Emperors New Groove where the laws of physics were over looked and ignored in the creation of the scene. #1 (19:05-19:48) After Emperor Kusko is