UNSTEADY STATE HEAT TRANSFER Heat transfer processes are prominent in engineering due to several applications in industry and environment. Heat transfer is central to the performance of propulsion systems‚ design of conventional space and water heating systems‚ cooling of electronic equipment‚ and many manufacturing processes (Campos 3). Unsteady state conduction is the class of heat transfer in which the temperature of the conducting medium varies with time and position. This occurs frequently in
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Questions 1 HKALE 1990 Biology Paper II 1 HKALE 1993 Biology Paper II 1 HKALE 1996 Biology Paper II 1 HKALE 1999 Biology Paper II 1 Suggested Solution 3 HKALE 1990 Biology Paper II 3 HKALE 1993 Biology Paper II 4 HKALE 1996 Biology Paper II 6 Questions HKALE 1990 Biology Paper II 5. (b) Discuss the importance of carbohydrates‚ lipids‚ proteins and roughage in the human diet. (8 marks) Suggested Solution… HKALE 1993 Biology Paper II 6. Based upon its properties‚ discuss
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Heat Capacity and Coastal Climates: Which Absorbs and Loses Heat Faster––Land or Water? PURPOSE The purpose of this lesson is to investigate the heat capacity of water and land and to explain how the properties of water influence coastal climates. EXPERIMENTAL DESIGN In this experiment‚ you will heat the same volume of water and sand or soil in two different containers. They will compare the temperatures of the water and the sand or soil as each beaker is heated and as each beaker cools to
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Wrap the wire around a pencil for a slinky effect. Tighten the screws to assure that the wires are fastened. To determine the power P of the immersion heater‚ fill up half of a plastic cup with regular tap water (must be able to cover the wire)‚ and heat it with your immersion heater. By measuring the temperature of water as a function of time‚ and draw a graph‚ you can calculate the power P. The heater is lowered into the water and is connected to an AC power supply (alternating current). At the same
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significant figures! ] SHOW YOUR WORK to get full credit. 1) Number of moles: 2) Pressure of each gas: 2. [ out of 16 pts ] When 11.1 g of lead reacts with 3.81 L of oxygen gas‚ measured at 1.00 atm and 25.0°C‚ 11.8 kJ of heat is released at constant pressure. What is ∆H° for this reaction? (R = 0.0821 L • atm/(K • mol)) 2Pb(s) + O2(g) → 2PbO(s) [ do not neglect significant figures! ] SHOW YOUR WORK to get full credit. 1) Determine
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specific latent heat of fusion of water? Specific latent heat of fusion is the amount of heat absorbed or released by a substance when changing states. This could be boiling or melting. Latent heat of fusion is the amount of energy needed to melt a substance‚ while latent heat of vaporisation is the amount of energy needed to boil a substance. The specific latent heat of fusion of water is 334 j/g In the graph‚ you can see that as the temperature increases more energy is needed to heat the water. When
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specific heat capacity of a solid Introduction: In this experiment I investigated the specific heat capacity of brass and aluminium‚ in order to do this I arranged a series circuit with a heater‚ the heater would go inside the brass and aluminium and heat it for an amount of time in which I decided‚ I also used the voltmeter in parallel. This arrangement made me able to arrange the equation VIT= mcΔθ‚ since the electrical energy in would be equal to the mass times the specific heat capacity and the
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photosynthesis requires water in order to create glucose. The fact that water has an unusually high specific heat capacity makes it a very useful substance for living organisms. Water does not change temperature very easily and therefore minimizes fluctuations in temperature in cells and creates a remarkably constant sea temperature for aquatic organisms. Water has a high latent heat of vaporisation which means that when animals sweat and plants transpire water‚ takes energy from the organism
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This experiment will test the suggestion that the enthalpy change between a metal and a solution of a salt is related to the relative position of the two metals in the reactivity. Presumably the further apart in the series the bigger the enthalpy change will be. The experiment is as follows‚ 1) Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s) 2) Zn(s) + Pb(NO3)2(aq) Zn(NO3)2 (aq) + Pb(s) Both of the solutions will be in 1mol.dm-3 Apparatus: Distilled Water Polystyrene Cup
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rev3.shtml The specific latent heat of a substance is a measure of how much heat energy is needed to melt or boil it. It is the energy needed to melt or boil 1 kg of the substance. Different substances have different specific latent heats. The specific latent heat of a given substance is different for boiling than it is for melting. The table shows some examples. Latent heats of substances substance specific latent heat of melting kJ/kg specific latent heat of boiling kJ/kg water 334 2260
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