Monthly Archives: March 2014

Assignment 9

This assignment is due Thursday, April 3, in class. Recall the exam is Tuesday, April 1. There will be no quiz that week.

1. Read Sections 6.3 and 6.4.
2. Do WeBWorK for Sections 6.3 and 6.4.
3. Do written problems Section 6.3 #22, 36, Section 6.4 #1, 14.

Assignment 8

Due March 25

  • Read Sections 6.1, 6.2
  • Do WeBWork for Sections 6.1 and 6.2
  • Do book problems:
    • Section 6.1 problems 5, 8, 24
    • Section 6.2 problems 11, 21, 24

Assignment 7

Due Tuesday, March 18.

  • WebWork for Sections 3.7 and 3.8
  • Read Sections 3.7 and 3.8
  • Book problems
    • Section 3.7 problems 3, 6, 11
    • Section 3.8 problems 5, 6, 10

Lecture supplement 3-6-14

We talked about forced spring vibrations. You can download a Sage worksheet that I used to generate the plots. Also, check out the disastrous consequences of resonance and the “beats” caused by amplitude modulation, both below.

(Note: for the sage worksheet to unpack properly, I had to use Stuffit Expander on a Mac. The build in archive utility didn’t work. You should get a .sws file after unzipping)

Resonance:

Beats:

Spring-mass systems (i.e. vibrations) bring this 90s gem to mind:

…And this older one: