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--- 184_projects:f21_project_15 [2021/08/19 15:23] – dmcpadden
+++ 184_projects:f21_project_15 [2021/12/10 14:43] (current) – [Project 15A: Metal Detector] dmcpadden
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-~~NOTOC~~
 ===== Project 15 =====
 ==== Project 15A: Metal Detector ====
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-Dramatic events have occurred all over the world as the stormclouds and alien spacecraft have been repelled by what has been described as reverse Hawkion beams. The breakthrough came when it was realized that you must cross the beams in order to disrupt the alien technology. In Lakeview, life has gotten back to relative normality but the town continues to use the magnetic field in order to keep any remaining boar tigers away. 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 try and capture a live adult EM Boar Tiger. S.P.A.R.T.A.N force has been tasked with acting as a local guide, as P.E.R.L head into the surrounding forest to complete 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 Dr. O'Tallest who did research on the boar tigers that their excrement has a very high percentage of nickel in it (it was the colorful poop that kept on being found all over town). 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.
+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.
 <WRAP info>
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   * Use the right hand rule to check the direction of the induced current.
 </WRAP>
+Conceptual 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 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?
+  - 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?
 ==== Project 15B: Sending signals ====
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 </WRAP>
+/*
+==== Project 15B: Design your own review ====
+Your group is to design two exam problems that can be used as practice problems by the class. As a reminder the topics for the final exam include:
+  - Electric fields (including force, potential, energy) from charges of different shapes
+  - Circuits
+  - Magnetic fields/forces
+  - Induction
+Your design should include both the **problem statement** and the **solution** to the problem. Imagination is a plus. Try to come up with a context for your problem (not just "There's a moving charge") and follow the typical format for exam questions (multiple parts, some calculations, some concept questions).
+A good solution will not just be equations but will include some commentary, so everyone can follow your work.
+We encourage you to take this opportunity to review any physics you had particular difficulty with. The tutors are here to help you consider the correctness of the physics you are trying to include in your problem.
+At the end of the project, please email your problems & solutions to: mcpadden@msu.edu. We will post all of the class's problems as extra resources that you can use for practice and review.
+*/