modern physics 2009     trimester 3

Serway's Chapter 16 (on-line only) on Cosmology

course expectations   &   syllabus

Monday,
March 30
Tuesday,
March 31
Wednesday,
April 1
Thursday,
April 2
Friday,
April 3
class

very short reading quiz due by 1 pm today.....

now available on moodle

if you are missing today's class for a prearranged absence, the quiz must be submitted by 8 pm Sunday

quiz next tuesday or wednesday ?? (we're waiting on votes from david and haoyang) on chapters 1 and 2
what we'll do
in class
more relativistic dynamics
finish chapter 2

last chance to practice Lorentz transformations and mass/energy stuff:

problem 1(23)

the faster-than-light jets observed in quasars....

at what speed (v/c) will the mistake we make by using the non-relativistic formula for KE be larger than 1%?

start nuclear physics
(always done
before class)

1st pages of chapter 2, pp. 41-43

fill in the 3 rows & columns we had on the board friday:

 formula learned in intro physics relativistic formula in frame in which object is at rest relativistic formula in frame in which object is moving force momentum work

1st pages of chapter 2, pp. 41-43

+

examples on page 44

+

examples on page 49,
especially example 6

13(1 up through/including example 2)

13(2 up through/including example 3)

then submit reading quiz above in moodle
in-class
presentation

written
homework
(by 5 pm)
write the LT equations
1(23) and 1(26) as a matrix equation of the form

a x-bar
(                  )   =
b ct-bar

ax
[L(v/c) ]  (          )
b ct

where

ax
(             )
b ct

represents a vector matrix of event coordinates in one frame

and

L(v/c)

is a 2x2-matrix that represents the operation that
transforms the event coordinates (x, ct) in frame S
to event coordinates (x-bar, ct-bar) in frame S-bar
bring to class:

problem 1(20)

also,
<-----

2(12, 15)

so you remember the formula for electic energy?

do you remember how to start a conservation of energy problem?

rocket and earth problem
(wherein you are encouraged to do as many LTs as possible; however, each part can also be done as a
length contraction,
OR
time dilation
OR
time-lapse problem
(a la Tonya & Reid)
lab

alpha sources arrived yesterday, but since the prelab is lengthy, we will wait till next week

you can start the prelab this weekend!

other

do some problems out of chapter 2 on mass, kinetic energy, and total energy for practice