# Physics Assignment essay

You must reference all sources used. Where text is quoted credit must be given to the source/author.. Learner’s Declaration certify that the work submitted is my own. Signed: Date: Assessor’s Declaration certify that the work submitted by the learner named above is original and has been completed independently. Name of Assessor: Scenario: For Pl you will be recapping fundamental concepts associated with energy and doing basic calculations applying the principles. For MI you have been asked by industry experts to use data from an investigation into kettles currently available on the market.

You will then advise them on how the eternal the kettle is made from affects its energy consumption performance. Task 1 – fill in the word equation, symbol formula and units equation for different energy equations Task 2 -? For the different scenarios draw the energy transfer diagrams, describe the energy transfers and then carry out the associated calculations perform calculations involving changes Of State for industrial processes You have been asked by industry experts to conduct an investigation into kettles currently available on the market.

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You will advise them on how the material that the kettle is made from, affects its energy consumption reference Pl- Describe the fundamental concepts associated with energy, using examples at home, work or in industry Assignment 1: Pl a – Work, Energy and Power To achieve Pl there are two pieces of work to be completed. The first one (Plan) is below. The first one is done for you as an example. Quantity Word Equation Symbol Formula Units Equation Work Done Work done = force x distance J = N XML Kinetic Energy Kinetic energy = h x mass x velocity K.

E=maxi J = keg m/so Gravitational Potential Energy Gravitational potential energy = mass x gravitational field strength x height GAPE=mix J = keg m/SAA x m Power Power = energy transformed x time p=text Elastic Potential Energy Elastic PEP ВЇ F = -xx Potential Energy = The second piece (Pl b) is below. In energy transfers energy can be converted from one form to another. When this happens some energy is always wasted. Complete the two tables independently for the industrial energy conversions shown below. The first one has been done for you.

Situation Diagram Energy Diagram and description of energy conversions Energy diagram Description of energy conversion Some of the input kinetic energy is used as useful energy to work in lifting the upscale The rest of the input energy is wasted as thermal energy lost to the environment Gravitational potential is used due to how high the person is consisted of. Calculate the GAPE of the mass 70 x 7 x 3430] Maximum height of the trolley =CACM Gravitational field strength ms-2 Kinetic energy is used Calculate- EKE of the mass 1. Mm/s x 1. Mm/s x Gig = 1. 8225 J Maximum GAPE of the trolley looms-2 x Gigs CACM =200 J Efficiency of the system MI – Perform calculations involving changes of state for industrial processes Scenario You have been provided some data by industry experts into kettles currently available on the market. You will advise them on how the material that the kettle is made from, affects its energy consumption performance.

You have decided to start your investigation by researching how the insulation of the kettle affects the energy required to convert water from its liquid state to gaseous state. Below are some examples of kettles that are available. Theory The latent heat of vaporization: is the energy required to change 1 kilogram of substance from a liquid to a gas without a change in temperature. Units of latent heat of vaporization: J Keg-l Equation: E ml (Energy latent heat f vaporization of substance x mass of substance that has changed state. ) Latent heat of vaporization of water: L = 2. X 106 J Keg-l Electrical Energy Input: E = electrical power x time unit conversion: 1 Keg – 1000 g Efficiency of a system: efficiency = (useful output energy / input energy) x 100% Apparatus Kettle Electronic balance Insulating material Stopwatch Water Method 1) 500 g of cold water was placed in a plastic kettle. 2) The kettle was placed on an electronic balance and its total mass recorded. 3) The kettle was then switch on and allowed to boil. 4) The switch was fixed so that it did not automatically switch off once the eater had reached boiling point. ) Upon reaching boiling point the stopwatch was started and the mass of water and kettle was recorded. 6) After a period of three minutes, the new mass of water and kettle was recorded. 7) The experiment was then repeated using lagging made of fibrous material wrapped around the kettle. Rest Its Non insulated Kettle Mass of kettle and water = 1209. 5 g Mass of kettle and water at COCA 1195. 8 g Mass of kettle and water after 3 minutes = 1066. 0 g Insulated Kettle (lagging made Of fibrous material) Mass of kettle and water and lagging= 1316. G Mass of kettle and water and lagging at 1 COO = 1315. 0 g Mass of kettle and water and lagging after 3 minutes 1 180. 4 g Calculations The energy required to change 1 Keg of liquid into gas without a change in temperature -? change in mass x latent heat of vaporization of water. E -? ml Latent heat of vaporization for water = 2. 26 x 1 06 J Keg Work out the evaporated mass of water and calculate the latent heat of vaporization for both kettles. [Remember to convert the unit Of mass to SSL unit ). Non insulated kettle Insulated kettle .

The electrical energy supplied in both cases is given by E = power x time Using the power dating Of the kettle (2330 W), calculate the electrical input energy: The efficiency of the energy transfer is calculated by: Efficiency = (Useful output energy / Input energy) x 100% Rewrite the above equation in terms of the energy types investigated. Efficiency = 100 Calculate the efficiency of the kettle in both cases using the appropriate energy Non-alienated kettle Useful output energy useful output energy = Efficiency Conclusion Input energy -? input energy-? Answer the following questions as your conclusion. Make sure your handwriting is legible.