184_projects:metal_detector_24

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184_projects:metal_detector_24 [2023/12/19 22:09] – created dmcpadden184_projects:metal_detector_24 [2024/04/12 18:11] (current) – [Main Problem] dmcpadden
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-==== Project: Metal Detector ====+===== Project: Metal Detector =====
  
-{{ 183_projects:rainbow.jpg?300 }}+==== Kick Off Questions ==== 
 +  - What would happen inside a metal if it is placed inside a magnetic field? 
 +  - Draw out a sine graph on your whiteboard. What is the amplitude of the graph? What is the frequency? 
 +  - What steps do you follow to use the $V_{ind}$ equation?
  
-Life has gotten back to normal in Lakeview as the continued magnetic field seems to have driven away the boar tigers. There has been the added bonus that there has been a drastic reduction in car accidents due to the populace being afraid that the magnetic field will destroy their engines. However, tranquility is unsettled when the government agency P.E.R.L. comes to town in order to further investigate the boar tiger phenomenon. You are a local guide, part-time engineer and a high ranking member of the McGyver fan club who has been recruited to go into the forest surrounding Lakeview to help P.E.R.L in their investigation. Once deep in the forest, your party is ambushed by boar tigers and several of the team are captured and taken away. The remaining members of the team try to follow the tracks of the Boar Tigers but this becomes impossible after a time. However, you remember hearing from a friend of yours that did research on the boar tigers that their excrement has a very high percentage of nickel in it. You indicate to the group that you think you can McGyver a metal detector together to track your kidnapped colleagues. You have access to a whole bunch of 12 gauge copper wire, an alternating current power supply that can produce a maximum current of 2 A and has a frequency of 60 Hz, and a voltmeter that will measure an alternating voltage. If the voltmeter measures a voltage bigger than 50 mV, it will sound an alarm. You want to design your metal detector so that if there is not a metal nearby, the voltmeter will be below the threshold; however, if there is a metal nearby, then the measured voltage on the voltmeter will be above the threshold and set off the alarm.  + 
 +==== Main Problem ==== 
 +{{ 184_notes:cute_bt.png?400 }} 
 + 
 +When you dug up Dr. Watersa's secret jellybean stash, you were immediately surrounded by the herd of EM-boartigers.  You were quite alarmed at first, but the EM-boartigers ignored you and focused on the jellybeans, the black licorice ones specifically.  Since black licorice jellybeans are disgusting anyway, you were happy to let the EM-boartigers have them. 
 + 
 +After eating the jellybeans the EM-boartigers became very friendly, even letting you pet them -- although you got some pretty ferocious static shocks in the process -- and then wandered away.  They seem to have completely disappeared, since no one in Lakeview has seen them in weeks now...maybe they just wanted the jellybeans all along?  But just as you were getting ready to leave Lakeview and return home, a new problem popped up.  The S.P.A.R.T.A.N. financial auditors say they need proof of these weird creatures, or they will disallow your expense reports for the whole time you've been trapped in Lakeview and you'll be on the hook for thousands of dollars in costs.  
 + 
 +Desperate, you turn to Manny for help since he's been right about everything all along.  He says his research on the boartigers suggests that their excrement has a very high percentage of nickel in it.  If you can MacGyver together a metal detector (similar to {{https://www.explainthatstuff.com/metaldetectors.html|this one}}), maybe you can find some...evidence...to give to the auditors.  
 + 
 +{{ 183_projects:rainbow.jpg?200 }} 
 + 
 +You have access to a whole bunch of 12 gauge copper wire, an alternating current power supply that can produce a maximum current of 2 A and has a frequency of 60 Hz, and a voltmeter that will measure an alternating voltage. If the voltmeter measures a voltage bigger than 50 mV, it will sound an alarm. You want to design your metal detector so that if there is not a metal nearby, the voltmeter will be below the threshold; however, if there is a metal nearby, then the measured voltage on the voltmeter will be above the threshold and set off the alarm.  
  
 <WRAP info> <WRAP info>
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 </WRAP> </WRAP>
  
-Conceptual Questions: +==== Wrap Up Questions ====
-  - What is design of a metal detector? (Hint: use your resources - *cough* google *cough*)+
   - What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there is *not* metal present?   - What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there is *not* metal present?
-  - What would happen inside the metal when it is placed inside a magnetic field? 
   - What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there *is* metal present?   - What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there *is* metal present?
   - If there was a lot of metal near your detector versus a small amount of metal, what would you expect to change?   - If there was a lot of metal near your detector versus a small amount of metal, what would you expect to change?
   - What assumptions are you making in this problem?   - What assumptions are you making in this problem?
  
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  • Last modified: 2023/12/19 22:09
  • by dmcpadden