Another hot day. I will see if I can pass multivar or not... Geeze

Dreams

I've been having a lot of dreams lately. Today I remember my dream vividly. I was at an air port with some people. Some how I had a cell phone, and a device that allowed radio waves to work again. It was strange because I was trying to go home or some where. Everything was very expensive. It felt like time had stopped. My mom's car wasn't that common, but because of some strange effect became rare. Same with one of my companions. He was wearing things that normally could me mass manufactured easily, but because of the weird effect the items became unique, thus valuable. There was a point where my group accidentally made a ruckus by activating the device. Time seemed to move forward a bit, and the cell phone I was also holding rang. We almost didn't make it out safely.

Physics!

Today we talked about beats, sonic booms, and the Doppler shift.

If you have mass, you can't travel the speed of light!

How do they teach physics in the south? (said after a failed demonstration due to humidity.)

1) Charging by 'contact'
glass (+) + silk(-)
plastic(-) + fur(+)

We also talked about electrons!

Coulomb

unit vector denoted by "hat"

Ch 15 Waves: Definitions

15.1


mechanical wave: a disturbance that travels through some material or substance
medium: some material or substance through which a mechanical wave travels

transverse = perpendicular

transverse waves: displacement of the medium are transverse to the direction of travel of the wave along the medium

longitudinal wave: displacement of the medium is in the same direction that the wave travels

propagates = travels
waves speed: speed of propagation; v

Mechanical waves:

1. propagates with a definite speed through medium
2. do not cause medium itself travel through space
3. must have energy added to system to be set in motion

15.2

wave pulse: single instance (wiggle) of a wave

periodic = repetitive

periodic wave: medium goes through periodic motion as the wave propagates

simple harmonic motion (SHM)

amplitude; A

frequency; f

angular frequency; ω = 2πf

period; T = 1/f = 2π/ω

sinusoidal waves: periodic waves with simple harmonic motion

wavelength: the distance from one crest to the next crest, or one trough to the next trough, or the from any point to the corresponding point on the next repetition of the wave shape; λ

wave function:

wave number:

phase:

wave equation:

intensity

interference:

boundary condition:

principle of superposition:

node:

antinode:

standing wave:

traveling wave:

destructive interference:

constructive interference:

fundamental frequency:

harmonics:

harmonic series:

overtone:

normal mode:

harmonic content:

10.6

10.

Graph: -4x^2-y^2

I wonder what's the difference between men's and women's laxitives.

Physics...

Mastering physics is a bit irritating, but I at least I completed the assignment. I need to sleep.