AssessmentInstructions:

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2. Includeatleast20wordsofmachine-readabletext,and
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   5. Youmustusetheprovided assessmentcoverpageavailableonyourMoodlestudent homepage. Submissions without a cover page will not be accepted.
   6. Youmustcorrectlytitleyourdocument/s.Forexample:
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   8. Itisyourresponsibilitytocheckthatyouhavesubmittedthecorrectfile,asrevised submissions are not permitted after the due date and time.

Important note:Failuretoadheretotheabovemayresultinacademicpenalties.Pleasereferto the unit outline or EIT Policies and Proceduresfor further information.

PleasecompleteyouranswersontheassessmentcoverpagedocumentavailableonMoodle.

Clearlylabelyourquestionnumbers(thereis noneedtocopythefull questionover). Includeallworking out.

Question1:MechanicalPropertiesof Materials (20 marks)

1. ViewthetensiletestexperimentationinMoodle(Video1toVideo6),justto

   understand

2. Acylindricalspecimenofstainlesssteelhavingadiameterof20mmanda gaugelengthof 75.250mmispulledintension.Usetheloadelongationdatabelowtoplotthestress-strain curve using Excel spreadsheet. Submit the Excel spreadsheet with the stress, strain and the curve. (5 marks)

1. Answerthefollowingquestions:
2. Determine the Youngs modulus of the material. Show your calculation to determine theYoungsModulus(E). (3marks)
3. Determinetheyieldstrengthofthematerialusingthe2%strainmethod. (3marks)

iii)DeterminetheUltimateTensileStrength(UTS)andthefracturestrength. (2marks)

1. Determinethepercentageductilitybasedonplastic (3marks)
2. DeterminethemodulusofShowyourcalculationtodeterminetheModulus of Resilience (Ur) (4marks)

Question2:ThermalPropertiesofMaterials (20 marks)

Experiment1

1. Openthefollowinglink:https://phet.colorado.edu/en/simulations/energy-forms-and-changes.

1. Conductthefollowingexperiment:
2. Attachathermometerto theironandplacetheiron onthe
3. Usingthestopwatchinyourphone,simultaneouslystartthestopwatchandraisethe level to Heat. Heat the iron to the temperature marked in red in figure below.

iii)Stopthestopwatch oncetemperatureisreachedandbringtheleverbacktothemiddle.

1. Record thetimetakentoachievethis
2. Continuestepsi)toiv)for

1. Basedonthetimetakentoachievethesetemperaturesforbothwaterand iron:
   1. discuss the relation between the difference in time and the specific heat of these materials(Considerbothmaterialshavethesamemass). (5marks)
   2. provideanexampleforeachofthesematerialsonhowtheirspecificheatcanbeused in reallife (5marks)

Experiment2:

1. Openthefollowinglink: https://phet.colorado.edu/sims/html/gas-properties/latest/gas-html.

1. Conductthefollowingexperiment:

1. SelectHOLDCONSTANTforVolume
2. Movethehandpumpupanddowntopumpsomeairparticlesintothe

iii)ObservethechangesinPressureandTemperature.

1. RaisetheleveltoHEATandobservethemovementsoftheparticles,thechangein pressure and temperature. The lower the level to COLD and observe the same.

1. Basedontheaboveobservations:

1. identify the gas law that is applicable in the observation and give the equation governingthisobservation (2marks)
2. explainthechangesintemperatureandpressurewhenthelevelismovedtoHEATand (5marks)

iii)brieflydescribeareal-lifeapplicationofthisgaslaw. (3marks)

Question3:OpticalPropertiesofMaterials (20 marks)

1. Thecompanyyouworkforhasbeencontractedtodesignthelightshowforarock You have been tasked to work on this project and as such begin by investigating the behaviour of lasers.

Thereisa95mWlaserwhichproduces650nmredlight;a80mWlaserwhichproduces

632.8nmorangelight;a75mWlaserthatproduces532nmgreenlight;an85mWlaser that produces 488 nm blue light; and a 65 mW laser which produces 434nm violet light.

1. Whatisthecorrelationbetweenthewattageandthecolourofthelasers?
2. Intermsofwavelength,whatisthesignificanceofthedifferentcolours?

iii)Istherearelationshipbetweentheenergyofaphotonandacertaincolour?

1. Dothedifferentcoloursof lasersaffectthevelocityofthelaserlight?
2. Whatisthenumberofphotonstheblue lightemitseachsecond?
3. Whatisthenumberofphotonstheredlightemitseach second?

vii)Compareanddiscussinbriefdetailtheresultsyouobtainforthe numberofphotonsin blue and red light.

Note: TakePlancksConstant,h=6.63 10^-34Jsandthe speedoflight,c=2.99792458 10⁸m/s. (10marks)

1. Thediagrambelowshowsaninterfacebetweenanunspecifiedtransparentliquidanda piece of Lucite. An incident ray of light that has been partially reflected and partially transmitted at the interface is also shown.
2. Determinetheangleof (1marks)
3. Determinetheangleof (1marks)

iii)Determinetheangleofrefraction. (1marks)

1. Determinetheindexofrefractionoftheunspecified (4marks)
2. What is the unspecified liquid? Provide information from external to support your (3marks)

Question4:ElectricalandMagneticPropertiesofMaterial (5 marks)

Thebasesemiconductingmaterialusedinallourmodernintegratedcircuitsissilicon. However, silicon has some limitations and restrictions. Write a short essay comparing the properties and applications of silicon and gallium arsenide.

Question5:MaterialSelectionandApplications (20 marks)

TheFigureQ5showsashovel, atoolusedtodigaswellastomoveloose,granular materials(like dirt, gravel, grain, or snow) from one spot to another.

FigureQ5

The shovel has three components: the shaft, handle and the blade. The blade (sometimes called a scoop)holdsthe materialbeingmoved whilethesocket fitsovertheshaft.At theendofthe shaftis the handle, which is used to grip and control the shovel.

Youhavebeenassignedtodesignthisshovelforanewclient.Theclienthasprovidedthebelowasa design requirement:

1. Lightweight?2kg
2. Bladeto supportaloadof5to7

iii.Thehandleshouldconsiderergonomicsdesign.

1. Costefficient
2. Usingthedesignrequirementtablebelow, conductanalysesforthehandle,shaftandblade of the shovel: (9 marks)

Note:Thereshouldbethreetable,oneeachforhandle,shaftandbladeoftheshovel.

1. Thefollowingdatawereproducedasthedesignmechanicalspecificationsforhandle,shaft and blade of the shovel. (5 marks)

Bladematerialspecification

Shaftmaterialspecification

Handlematerialspecification.

Use the Ashby Charts from the lecture slide to identify suitable materials for ONE shovel component.IdentifyTHREEdifferentmaterialsthatsatisfythemechanicalspecificationsin all the four Ashby charts for each component.

1. YoungsModulus-Density
2. FractureStrengthDensity

iii)FractureStrengthYoungsModulus

1. YoungsModulusRelativecost/vol
2. Fortheselected component,identifythesuitablematerialsoutofthe threeselectedin(b), basedonthedesignrequirementsandthemechanical specifications.Give justificationsfor the materials selection by providing the pros and cons of each material and how they addressthedesign (6marks)

Question6:ReflectivePractice (5 marks)

Answerallquestions.

1. WhatskillsorknowledgedidIgainfromthisassessmentandhowcanIapplytheseinmy work?
2. WhatismyoverallreflectionofthisunitandwhatengineeringabilityhaveIgainedtohelp me grow as an engineer?
3. WhatpersonalandprofessionalattributeshaveIdemonstratedduringthisprojector assignment?
4. HowwasmyoverallexperienceintermsofteachingandsupportfrommyunitLecturer?

Question7:Videodemonstration (10marks)

CreateandsubmitaLoomvideowithwebcamON(showingyourface)andscreencaptureshowing and explaining ANY TWO SOLUTIONS/ANSWERS from Questions 1, 2, 3 and 5. The video length should NOT be more than 5 minutes. So, practice well before recording.

Thisvideoisoneofthemandatoryrequirementsandifyoudontsubmitthisvideo, your

assessmentmarkswillbezero.

TheguidelinesonhowtocreateaLoom video:

https://www.loom.com/share/159e007948ce4cb8acfee8a99615f388

ENDOFASSESSMENT