machines was recently proposed. Ball mill A typical type of fine grinder is the ball mill. A slightly inclined or horizontal rotating cylinder is partially filled with balls‚ usually stone or metal‚ which grinds material to the necessary fineness by friction and impact with the tumbling balls. Ball mills normally operate with an approximate ball charge of 30%. Ball mills are characterized by their smaller (comparatively) diameter and longer length‚ and often have a length 1.5 to 2.5 times the diameter
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1. Determine the spring constant‚ k‚ of Spring 1‚ by using Hooke’s Law. Take three different measurements (since 3 masses) and do three calculations and average your k’s to get a more accurate answer. By applying lots of friction‚ you will be able to get your mass to hang still. Show a table of your data and your calculations of k. Spring 1 with three different masses: 50 grams: Spring stretched: 5m F = 50gm * 9.8 m/s2 = 490.00 N K= 490/5m = 98 100 grams: Spring stretched: 10m F = 100gm * 9
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2011 Available online at http://www.academicjournals.org/IJPS DOI: 10.5897/IJPS11.1092 ISSN 1992 - 1950 © 2011 Academic Journals Full Length Research Paper Numerical study of laminar mixed convection heat transfer of power-law non-Newtonian fluids in square enclosures by finite volume method Mohammad Reza Safaei1*‚ Behnam Rahmanian2 and Marjan Goodarzi3 1 Young Researchers Club and Department of Mechanical Engineering‚ Mashhad Branch‚ Islamic Azad University‚ Mashhad‚ Iran. 2 Department
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COLTEN MCDERMOTT BIOMECHANICAL PRINCIPLES BASKETBALL Colten McDermott HPED 315 2-May-12 Biomechanical Principles In Basketball Basketball is a very competitive and popular sport in our society today. The NBA playoffs are going on right now and it has proved to be a very physical and intense post season. This sport takes an extreme amount of talent‚ coordination‚ and athletic ability to become a champion. There are a few biomechanical principles that are present during the game of basketball
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Change means movement. Movement means friction. Only in the frictionless vacuum of a nonexistent abstract world can movement or ch ange occur without that abrasive friction of conflict. L Read more at http://quotes.dictionary.com/subject/change?page=2#FQsjQUBGpH0yu2TT.99 It is change‚ continuing change‚ inevitable change‚ that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is‚ but the world as it will
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faster it falls. This is understandable if a feather and a stone were dropped from the same height. However Aristotle failed to further test his hypothesis in order to take into consideration other variables such as air resistance‚ surface area and friction. Galileo conducted many experiments to prove his theory correct that objects of different masses‚ dropped from the same height will reach the ground at the same time. (Kallos‚ 2004) Galileo also deduced that in a vacuum‚ all objects fall at the
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elevator moves up with a constant speed of 2.0 m/s2 . (b) The elevator has a constant upward acceleration of 2.0 m/s2 . (c) The elevator has a constant downward acceleration of 2.0 m/s2 . (d) The cable snaps and the elevator falls freely (ignore friction and the bloody end!). SOLUTION: The weight of the person depends on Mass and g‚ therefore: W = M g = (70.0 kg) 9.80 m/s2 = 686 N downward in all cases (a)-(d). Using the free-body-diagram for the person is shown to the right‚ We solve for N (which
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EM/OCT2009/MEC111 UNIVERSITI TEKNOLOGI MARA FINAL EXAMINATION COURSE COURSE CODE EXAMINATION TIME : : : : STATICS MEC111 OCTOBER 2009 3 HOURS INSTRUCTIONS TO CANDIDATES 1. 2. 3. This question paper consists of five (5) questions. Answer ALL questions in the Answer Booklet. Start each answer on a new page. Do not bring any material into the examination room unless permission is given by the invigilator. Please check to make sure that this examination pack consists of: i) ii) the Question Paper
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3 (Start on a new page.) A stone is thrown vertically upward at a velocity of 10 m·s-1 from the top of a tower of height 50 m. After some time the stone passes the edge of the tower and strikes the ground below the tower. Ignore the effects of friction. 3.1 Draw a labelled free-body diagram showing the force(s) acting on the stone during its motion.(1) 3.2 Calculate the: 3.2.1 Time taken by the stone to reach its
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with a stationary block of mass M. Assuming a fully elastic collision find the distance the block will slide if the dynamic friction is µ. during swing down m acquires speed u: m g Δh = 1/2 m u2 ⇒ u = [2g R(1 - cosθ)]1/2 let ρ = (m/M) then speed of block just after impact is: V = 2ρ2 u/(1 + ρ) v = u (ρ - 1)/(1 + ρ) so after collision‚ block M has KE: K = 1/2 M V2 friction force does work on the sliding block to bring its speed to zero: W = f Δx = µ M g Δx = K ⇒ Δx = K/(µ M g) = 1 /2 V 2/(µ
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