Welcome to the PHYSICS 105, Fall 2000, Course Page--- (remember to reload...)
1st Homework assignment includes:
1. The water tower problem and the mechanical analog to the "water tower problem"
as discussed/assigned in class. (calulate the range vs height of the hole (reflector)).
b)---Graph your result for this problem (range vs ...)
c)---Also draw three water stream trajectories chosen to illustrate your result.
indicate what point they correspond to on your graph from (b).
---------------------------------------------------------
2. Now do the same problem with damping (air friction) added for the portion after the ball
leaves the "water tower". This MAY be hard to do in general, but perhaps you can do
calculate to lowest order the effect of a very small damping, B (beta).
(for the x motion the eqn of motion is them: ma=-2mBv ,
where v is the x velocity and a is the x acceleration and B is the damping parameter)
(for the y motion the eqn of motion is them: ma=-2mBv-mg ,
where v is the y velocity and a is the y acceleration and B is the (same) damping parameter and
g is gravity...)
[this notation is good as it ties in with damped osicllator notation we will use soon.
Do not use the notation that the book uses in chapter 2.]
Can you also do this for the case of light damping both in the intitial fall section
and in the flight trajectory section? How messy does it get?
---------------------------------------------------------
3.--- Do the same problem for the case of heavy damping (large B).
What is a suitable definition for heavy damping? SHould B be greater than
something? What?
Is this easier or harder? (than light damping)
(Note: the eres bulletin board is a
valuable resource for people doing homework.)
Click here for ERES Bulletin Board...
Click here for ERES WEBB Site...
Homework is due each Friday by 2:00 PM
in the Physics Department Office, 297 Kerr Hall.
(Look for the "105 box".)
Click here to post comments on problems...
(The ERES page, passwd=105)
Note: FINDING ERRORS in solutions or in problems/answers in the book gets you xtra credit !
Check out the ERES bulletin board. Post comments and point out ambiguities etc...
Everything below this line is for future use..... NOT active yet...
-------------------------------------------------------------------------------------------------------
marilyn
jayz
cow
rainbow
cow
Click here for the 7th HW assignment
Click here for the 6th HW assignment
Click here for the 5th HW assignment
Click here for the 4th HW assignment
Zack Schlesinger
Department of Physics
University of California, Santa Cruz
office: 205 Kerr Hall
zack@physics.ucsc.edu
Office Hours:
2:00 - 3:00 PM, Thursday
office: 205 Kerr Hall