I've posted a review page for Exam #3, which will be held next Friday, April 13, from 7:30-8:20am in UC McConomy. You can find the link on the schedule page. I'll update it with old exam problems when I get a chance.
UPDATE: I've added some old exam problems to the review page.
UPDATE: I will hold a review session tonight from 6:30-8:00 in DH 2210. You can ask whatever questions you may have then.
21 comments:
can you have the hw solutions out somewhere for us to pick up like you did with the first exam??
Will we need to memorize all the equations for damped oscillations (i.e. page 196) or will they be provided?
Could you set up a time for the review session between 4:30pm and 6:30pm on Wednesday? Alot of us have class at 6:30pm through the evening and can't make it (alot as in me for one :) ).
in response to that last poster...a lot of people that do activities or sports have practice or meetings between 4:30-6:30 the later the better usually
anonymous at 9:07,
Yes. I've asked the TA's to put any extra solutions they have in a box just outside my office door (WEH 6214). It looks like they (or some of them, at least) have done so.
If you can't find what you are looking for, let me know, and I'll try to round it up.
anonymous at 2:58,
In my text p. 196 discusses undamped oscillations. Specifically, it covers how to determine the amplitude R and phase angle δ from the coefficients A and B of cosine and sine in the solution. This you ought to know.
The formulas for undamped oscillations, say equations (22)-(25), should not be memerized. They are essentially applying the formulas for solutions to second order, linear, homogeneous, constant coefficient differential equations to this special case.
I hope that helps.
needreview,
I am working on scheduling a review session for Wednesday. Unfortunately, it may be at a time when you can't attend. You will at least have recitations on Thrusday to ask questions of your TA's.
Will we be asked to use the "old way" of solving diff. eqns. by converting to a system, finding e-vectors etc., as on the homeworks, or can we concentrate on using the shortcuts?
short_memory,
You should be able to convert a second order (lin., const. coeff., homog.) differential equation to a first order system, solve the system, and then identify the solution to the original equation.
That having been said, you are welcome to use the shortcut formulas, based on roots of the characteristic polynomial, that we derived in class. That is, unless I specify otherwise, like I did for a few of the homework problems.
Thank you very much for going over all the review problems tonight.
i also couldn't go to the review session last night cuz of class.. i hate to be the one to bring this up again but it simply does not make sense to me that you do not post solutions or have them ready to pick up somewhere. now apparantly the people who went to the review session have solutions and people like me do not. giving solutions during a review session or handing them out have no difference in my mind.
anonymous @5:00AM
I recommend showing up for recitation, we'll be covering the review sheet for the most part
short_memory,
You should be able to convert a second order (lin., const. coeff., homog.) differential equation to a first order system, solve the system, and then identify the solution to the original equation.
That having been said, you are welcome to use the shortcut formulas, based on roots of the characteristic polynomial, that we derived in class. That is, unless I specify otherwise, like I did for a few of the homework problems.
Umm, is the fact that you posted that twice a hint?
I would just like to say something...
(Too creative a question) + (Too early an exam) = "Boom!" (The solution diverges)
and am I right to say that we didn't deal with f(ct) in class? All I remember is that for the Laplace transform of c f(t), the constant c can be moved out of the transformation as Laplace is a linear transformation. And t f(t)? Never seen it before. Arrrgh...this exam is too hard! I'm going to sleep now...
I agree with Michael. I felt ill-prepared for that question because
1) we never saw it in lecture
2) it is not in the chapters of the book covered for this exam
3) I did not know how to extrapolate what we have learned to that particular problem in 10 minutes
although i didn't get the second part of that question, i still feel like i had the preparation necessary to solve both parts
Neither parts of the last problem were really difficult if you just tried to work through them using the definition of the Laplace Transform.
That said I messed up on part a because I considered f(ct) to be a function of ct... which doesn't make much sense considering the steps I took after. Bah
I have to say that I was not a fan of having the exam at 7:30. I was way too tired; I couldn't even do simply math properly.
Is is true that we don't have class this Wednesday or Friday? What about recitation? Is there homework?
We don't have classes on Thursday or Friday due to Carnival. You'll note that on the Schedule page no homework is assigned. If I recall correctly, we don't have classes on Wednesday for as compensation for having class after the test (I think).
anonymous at 6:14,
I'm not sure exactly why that comment posted twice. It spent a long time in the composer window, and that may have confused it. I wasn't trying to send any subtle messages.
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