• Blank copy of Math Quiz #11 is available at the Math page.
• Math Quiz #11 Revisions & Reflection are due 1pm Tue. Feb. 20.
  
• See this post for detailed guidelines for Revisions and Reflections

Here is a video on semiconductors devices and, in particular, the NPN transistor. In lab you will be building a version of the transistor switch (0:25-0:31 of the video).

I’d like you to watch through about 5:50 of the video (keep watching if you want a brief introduction to transistors used as amplifiers).

Here’s a revised reading schedule for the quarter.

Apologies for taking so long to get this to you. If I’d just shifted everything one lecture slot later, you would have done two labs before you’d reached the concepts in lecture. 

Adjustments: We will be having a quick lecture (~20 min) on properties of liquid/gas interactions (section 11.4) before the start of lab on 2/20. We will also have a full-length lecture/workshop on entropy and free energy before our lab clean on 3/6. 

Download (PDF, 48KB)

• Please find problem set assignment at the Math page, also linked in the main navigation bar.
• Complete All Problems in your Math Problem Set Notebook. Bold underline problems also due via WebAssign by 9pm on Fri. Feb. 16, 2018.

• Chemistry: McMurray & Fay 8.10-8.13,11.1-11.8
• Math: Stewart 6.1, 6.2, 6.3
  • Math Reading Responses due via WebAssign 3pm Sun. Feb. 11
• Physics: Wolfson 25.1-25.5; 18.1-18.3
  • Physics Reading Response due via MasteringPhysics 6pm Sun. Feb. 11

• Reminders:
  • Math Exam 3 Revision and Reflection due 9am Mon. Feb. 12
  • Energy Project Literature Review due 9am Tue. Feb. 20

The IDEAl solution for this week is the first problem of the revision edition of Quiz 11, finding the electrostatic potential energy of three charges at the vertices of an equilateral triangle. If you make quiz revisions, please use the version posted here (and in the program fileshare).

A quick remark on IDEAl solutions. When you write these, each equation should have a brief justification. By this I mean in terms of the physical situation – why a particular law applies, how the geometry of the problem leads to a particular formula, etc. The one thing that is not what I mean by “justification” is a description of the algebra you have done (or will do) in solving the problem. For instance, if I were doing a problem involving a mass vibrating on a spring that asked for the period, and you wrote the formula omega^2 = sqrt(k/m), you should justify it be writing something like “formula for angular frequency of mass on a spring” rather than “I can use this to plug into T=2 pi omega.” True, you may use that formula to eliminate an unknown quantity as you do the algebra, but the reason you can legitimately use the formula is not because it has a variable you want to eliminate, but because it is relevant to the physical situation.

A way of remembering this is to realize that when I look at your solution, the algebra steps you use will be right there in front of me. You have no reason to describe what you are about to do, because I can see what you actually did! So words outlining your algebra work are unnecessary busy work for you to write and for me to read. What I want you to do is focus on identifying how you know, based on the physics of a problem, what equations are applicable, rather than choosing equations based on what symbols appear in them.

Download (DOCX, 192KB)

As rated by students elsewhere, Problem 10 was rated 4 for difficulty, 5 and 15 are both a 3, and 2, 11, 12, 13 and 17 were rated 2, with the rest deemed a 1.

System-recorded median time to complete problems rated 10 as the longest, then 17, then 5, 11, 12, 15, 16 and 17 (which were all the same)

• Handout from Math Exam 3 Group Revision Workshop
• Link to Math Exam 3 Revision info

A representative from the Washington State Opportunity Scholarship will be visiting Wednesday, February 7, 11:30 am to 3:00 pm, with an information table in the CAB, second floor lobby. Flyer with details; this scholarship has a process for Evergreen students re: the GPA requirement.

• Blank copy of Math Exam 3.
  • Please note the modifications to question 12. I should have explicitly indicated that one would need to use numerical or graphical methods to solve the expression you would arrive at after taking the derivative.
  • I apologize to you for the frustration that must have caused those of you who were trying to solve this algebraically during the exam.
• You can find detailed guidelines for Math Exam 3 Revisions and Reflections here.
• Math Exam 3 Revisions and Reflections are due 9am Mon. Feb. 12 in class.