HERIOT WATT UNIVERSITY SCHOOL OF ENGINEERING AND PHYSICAL SCIENCES DEGREE OF BENG IN MECHANICAL ENGINEERING First Year Mechanical Engineering Science 3 ??day ?? June 2007 ??:?? – ??:?? Answer TWO questions from each section A & B. Section A Q1. a) For a Newtonian fluid state an expression for the shear stress. [4 marks] b) An ice hockey puck traverses the ice on a thin sheet of water. A puck struck by an ice hockey player Initially travels
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reasons‚ such as friction between materials and grinding body and impact between grinding body and liner plate. The temperature of grinding materials is too high and the heat loss after grinding is less. Ventilation effect in production is not good because of technological limitations. With the development of large scale ball mill‚ heat dissipation on per unit becomes less. High temperature in special season will affect the cooling effect of ball mill. These all cause the excessive internal temperature
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sg/zeb/poweredbysun.html)‚ the Z.E.B. Singapore is fully powered by solar energy‚ whereas the Z.E.O building in China is semi-powered by solar energy. Aside from solar energy‚ the Z.E.O. building in China converts heat energy collected from a horitzontal water sourced heat pump as well as a vertical soil sourced heat pump into energy for lighting as well as for the heating and cooling of the building. Z.E.B. Singapore isn’t in a four-season part of the world‚ thus‚ it doesn’t require a cooling and heating system
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COLLECTION AND PROCESSING Temperature Data Table for Trial 1 Trial 1 | Initial Temperature / °C ± 0.5 °C | Final Temperature / °C ± 0.5 °C | Reaction 1 | 24 °C | 30 °C | Reaction 2 | 25 °C | 31 °C | Reaction 3 | 24 °C | 35 °C | Specific heat capacity: 4.18 J g-1 °C-1 Density of the solutions: 1 g cm-3 Volume of solutions: 100 cm3 ± 0.1 cm3 Molar mass of NaOH = 40 g mol-1 Temperature Data Table for Trial 2 Trial 2 | Initial Temperature / °C ± 0.5 °C | Final Temperature / °C ±
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How does it work? The bubble wrap resists changes in temperature and the air inside of the bubble changes gradually due to the movement of the molecules. Cavity wall insulation combines with captive air to act as a barrier in preventing loss of heat. So during winter or summer‚ the temperature inside the room would last longer whether it is cold or hot air. Material 1. Bubble Wrap - The price of the 12-inch wide x 30-feet long is $4.97 dollar in Amazon website. 2. Water Spray - Simply‚
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same time‚ in one process with one fuel. It is a way of recycling energy. Molasses which is obtained from sugar is used together with fossil fuel to produce the heat energy like steam and hot water. This process produces electricity which can be used in the power plant itself or be sold on a wider range that is to the population. The heat energy can be used to burn bagasse to produce ethanol. It reduces fuel cost. This type of power can be used in various domains like schools‚ commercial laundries
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time noticing the actual color change of the flame. D. Explain how the observed colors are produced? As the substances are heated‚ the electrons move to higher energy levels by absorbing the heat. This state is unstable and the electrons tend to return to their ground state and release the absorbed heat energy in the form of electromagnetic energy. A portion of this energy
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The results of the trials make sense because although heat dry’s stuff very quickly and efficiently‚ the glue was made to stay at room temperature. It would be logical that the heated wood was not as strong as the room temperature wood because the glue sort of melted and then hardened. It also makes sense
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Homemade Thermometer In middle school your child will be learning all about heat energy and temperature measurement‚ and will likely get to use a lab thermometer. This project will enable your child to construct a homemade thermometer that will compliment what he’s learning about this instrument in school. What You Need: * Tap water * Rubbing alcohol * 11-ounce clear‚ narrow-necked plastic bottle * Red food coloring * Clear plastic drinking straw * Modeling clay *
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1) 0.069 mol MgSO4/ 0.015 mol H2O = 4.6 = 5 Formulae for hydrated MgSO4 = MgSO4 5H2O 2) There are at least two reasons why heating to find percentage of water in hydrated crystals is not recommended for all hydrates. The first reason is that some hydrates have such a strong bond with the water that not all of it will be able to be removed. The second reason is that different hydrates have their own mass. Depending on the mass and type of hydrate‚ some of the molecule may be burned off from heating
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