Consider a very hot mug of coffee on the countertop of your kitchen. For discussion purposes‚ we will say that the cup of coffee has a temperature of 80°C and that the surroundings has a temperature of 26°C. What do you suppose will happen in this situation? I suspect that you know that the cup of coffee will gradually cool down over time. At 80°C‚ you wouldn’t dare drink the coffee. Even the coffee mug will likely be too hot to touch. But over time‚ both the coffee mug and the coffee will cool down
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Quintessence Another genre of model for dark energy are the scalar-field models. Unlike the cosmological constant‚ the scalar-field models are dynamic. They hold that the force causing the accelerating expansion of the universe varies based on time and locations. Moreover‚ as the name suggests‚ scalar fields are used to demonstrate the magnitude at the specified point in space and time. In essence‚ they demonstrate that the fabric of space-time is not homogeneous. Consequently‚ a non-homogeneous
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Burning peanuts to simulate cellular respiration This lab will be assessed on Conclusion & Evaluation. Aim To determine the average energy content of 1g of peanut. Method 1. Set up a clamp stand so that it is holding a 100cm3 beaker. 2. Using a measuring cylinder‚ pour 50cm3 of water into the beaker. 3. Use a thermometer to record the temperature of the water. 4. Place some aluminium foil over the beaker to prevent heat loss. 5. Record the mass of a peanut using an electronic balance
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Heat‚ Temperature‚ and Phase Changes Assessment Practice Answer This graph shows what happens to the temperature of the water‚ while it was boiling in a kettle‚ as heat energy was being added to it and what the water was doing will it began to warm and change states. During a phase change‚ the temperature remains mainly constant. This occurs because the heat energy is used to break the bonds between the ice molecules as they turn into a liquid phase. It is possible to constantly
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Phase Change Lab Report by Dylan Norford Abstract: The purpose of this experiment is to study the energy changes associated with the phase changes of water. In this experiment we know the water is gaining energy so we know the heat is going to be positive and we can use the equation MCΔT to find the energy change. The specific heat will be 1 and we just have to measure the water to find the mass and take the temperature before and after we start to find the energy change. Background: The science
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Specific Heat Lab Objective: Find the specific heat of the unknown metal given using calorimetry. Background Theory: In every reaction‚ energy is transferred between a system and its environment. A system encompasses the substances that are involved in a reaction‚ and everything else in the universe other than the system is called the environment. The standard SI unit of energy is Joules (J). Temperature is the level of excitement of the atoms in a substance. In most cases‚ energy is
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The Hong Kong Polytechnic University Department of Civil & Structural Engineering BEng(Hons) in Civil Engineering Structural Mechanics II Laboratory Instruction Sheet: Shear Center Objective: (1) To find the shear center of various cross sections‚ and (2) To compare them with the theoretical values. Apparatus: Three mild steel frames made of different cross sections (channel‚ equal angle and ‘Z‚ section). Two dial gauges‚ end support brackets‚ load hangers‚ weights. Procedure: 1.
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Brayton Cycle (Gas Turbine) for Propulsion Application Analysis Engineering Software P.O. Box 1180‚ Germantown‚ MD 20875 Phone: (301) 540-3605 FAX: (301) 540-3605 E-Mail: info@engineering-4e.com Web Site: http://www.engineering-4e.com Brayton Cycle (Gas Turbine) for Propulsion Application Analysis by Engineering Software Course Category: Engineers Course Level: Intermediate Credit: 1 Hour -- i -- Brayton Cycle (Gas Turbine) for Propulsion Application Analysis Course Description The ideal cycle
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Combustion Of Alcohols Planning This investigation involves burning alcohol in the air. Key science- Chemistry by Eileen Ramsden says that " an alcohol is a series of organic‚ homologous compounds‚ with the general formula Cn H2n+1OH". The alcohol reacts with the oxygen in the air to form the products water and carbon dioxide: Cn H2n+1OH +(n+n/2)-1O2 ? nH2O + nCO2 The structure of the molecules in this reaction is: H H | | H - C - C - O- H + 3[O=O] ? 1/2[O=C=O] + 3[H-O-H] | | H H This reaction
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NUS/ECE EE4101 Antenna Arrays 1 Introduction Antenna arrays are becoming increasingly important in wireless communications. Advantages of using antenna arrays: 1. They can provide the capability of a steerable beam (radiation direction change) as in smart antennas. 2. They can provide a high gain (array gain) by using simple antenna elements. 3. They provide a diversity gain in multipath signal reception. 4. They enable array signal processing. Hon Tat Hui 1 Antenna Arrays NUS/ECE
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