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A-Level Physics

Question: Comparing the Energy Outputs of Different Fuels. Aim: To investigate the amount of energy released from different fuel sources and to compare respective costs of the fuels per kilo joule of energy transferred.

Answer: Hypothesis: I suggest the longer the hydro-carbon chain of the fuel being burnt the greater the energy released per gram of fuel burnt. However given the price of fuel per gram, typically, does not increase proportionately to the chain length, the fuel releasing the most energy may not necessarily be the most cost effective. Procedure: 1. Start by setting measuring out 200ml of water, transfer to the copper beaker and take the water temperature. 2. Now clamp the beaker to the frame and adjust so that the bottom of the beaker is at a height exactly 4cm from the top of the crucible (when the crucible is directly under it).......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Investigate the relationship between the fusing current and the diameter of a wire.

Answer: Fusing current is the amount of current that requires meeting the melting point of a wire, when current flows in a wire its temperature rises until the rate of loss of heat to the surroundings equals the rate at which heat is produced. If this temperature exceeds the melting-point of the material of the wire, the wire melts. Cross Sectional Area of the wire A thick wire allow a high current through it, while a thin wire would be difficult to get through due to it\'s restriction to a high rate of flow.......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: How is the internal resistance of a standard battery affected by temperature?

Answer: Internal resistance can be affected by many factors. One main variable, and the one I will be exploring is that of temperature. Hypothesis- I predict that the temperature rise and increase in the internal resistance will be directly proportional. In ideal conditions, this would be the case , however, we must remember to account for atmospheric influences and human error. It is more likely that after a steady rise, the correlation will become more and more negative, as the water bath , in which the battery sits begins to cool. Other influences, such as efficiency of the battery and the method in which it is used will also effect its performance. Batteries conduct heat , they must have the ability to do so as they are made of metal (Zinc) and convert chemical energy......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Experiment: Fuel release by Methanol, Ethanol, and Propanol.

Answer: Introduction: The aim of the experiment is to find out which fuel releases the greatest amount of heat. The fuels that will be used in this experiment are Methanol, Ethanol, and Propanol. To do this, we must find the enthalpy change when these fuels are combusted. Because the fuels burn in a powerful explosion when lighted up in a jar; they will be kept in a spirit lamp, the change in temperature will be recorded with the help of a second medium.......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: A Critical Account of Scientific Reading: ‘The Guide To The Galaxy’ by Nigel Henbest and Heather Couper.

Answer: I am writing about a scientific book called ‘The Guide To The Galaxy’ by Nigel Henbest and Heather Couper and published by the Press Syndicate of the University of Cambridge 1994. This book is about the galaxy in which our planet and our solar system lie. It contains information that goes beyond what most people or people with limited scientific knowledge know. The book talks about the efforts and the hard work by early scientists to discover more and more about our galaxy. It also talks about the most sophisticated techniques used nowadays to probe the galaxy.......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

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