## courses > physics 221-223

### physics 223

To use Spotter, click on one of the following links:

The textbooks are Simple Nature and Relativity Simply Explained.

Lab manual: download

codes for comments on lab writeups

I'm the author of the book. I do not receive any royalty from sales of the book. You can choose to download the book for free and print it yourself, but you typically don't save any significant amount of money that way, and what you get is a big, thick, unbound stack of single-sided output.

syllabus for Physics 223, fall 2015

homework printout### physics 221

To use Spotter, click on one of the following links:

The textbook is Mechanics.

You need to download and print the lab manual.

I'm the author of the book. I do not receive any royalty from sales of the book. You can choose to download the book for free and print it yourself, but you typically don't save any significant amount of money that way, and what you get is a big, thick, unbound stack of single-sided output.

syllabus for Physics 221, spring 2012

### physics 222

To use Spotter, click on one of the following links:

Lab manual: download, in print

I'm the author of the book. I do not receive any royalty from sales of the book. You can choose to download the book for free and print it yourself, but you typically don't save any significant amount of money that way, and what you get is a big, thick, unbound stack of single-sided output.

syllabus for Physics 222, fall 2007

### miscellany

To calculate a standard deviation, click here.

Browser-based app demonstrating entropy

data analysis for exercise 12E in Optics

### computer software for doing integrals

Usually the best quick and dirty way to do an integral is by using the web interface at integrals.com. However, integrals.com only does indefinite integrals, and there are cases where a definite integral is doable, but the corresponding indefinite integral is impossible to calculate, so you can't just evaluate the definite integral by plugging in the upper and lower limits of integration into the indefinite integral. As far as I know, the best open-source software for doing integrals is maxima. It runs on Linux, MacoS X, and Windows. I have it installed on the Linux machine on the lab bench at the back of the room. To run it, log in using the username and password posted on the monitor, right click on the desktop, and select Open Terminal with the left mouse button. Type "maxima" at the prompt. Examples of using Maxima to do integrals:

the indefinite integral of cx^2: integrate(c*x^2,x); (The asterisk indicates notation. The second argument to the function tells the software what variable you want to integrate with respect to; it plays the same role as the Leibniz notation dx inside an integral in normal human calculus notation. Since c isn't the variable you're integrating with respect to, it's assumed to be a constant.) the definite integral of e^-x, from 0 to infinity: integrate(exp(-x),x,0,inf); (Note that the Exp function has to be capitalized; the same is true for Sin, Cos, etc. INF stands for infinity.) the definite integral of e^(-x^2), from 0 to infinity: integrate(exp(-x^2),x,0,inf); (Note that this integral can't be evaluated as an indefinite integral in terms of elementary functions like exponentials, trig functions, etc.) To exit maxima when you're done: quit();