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- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!gatech!destroyer!news.iastate.edu!isuvax.iastate.edu!TWH18
- From: twh18@isuvax.iastate.edu (Phoenix)
- Subject: Cards for hp48SX?
- Message-ID: <Bzq66E.AK0@news.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Reply-To: twh18@isuvax.iastate.edu
- Organization: Iowa State University, Ames, Iowa
- Date: Wed, 23 Dec 1992 18:32:36 GMT
- Lines: 66
-
- From what I read on the Educalc catalog, they have a
- chemistry card which can do some equation balancing. I was
- wondering if anyone knows how good is it. Like, can it
- balancing the equation based on the reactants only and gives
- you the products? Can it do oxidation/reduction formula
- blancing? and what other good features does it have?
- Thanks in advance.
- I also have something to say about use graphing calc's
- on test. Since most of my opinon are being expressed in the
- last few posts. I just want to give an example:
- I was Calclus BC class. When we taught about apprximate
- area under curve by using inscribe/circumscribe rectangles, trapzoids,
- and simspon's rules, I thought I might as well to program it on
- my TI-85 to help me a little on the test, also practce my prg skills.
- (the main reason was that find the error for simpson's rule was
- kind of messy, taking the 4th derivatives is not that fun)
- Well, I started it 1 week before the test, by spending
- average 3 horus on programing, by the 5th day, I finally completed
- it so that when I enter the equation, and A,B(range), and N(how many
- slices), it will give me everything from ins/cir rect, trap, and simpson
- appoximations and it's errors, plus the acutally area done by TI-85's
- FnInt mode. I spent about 18-20 hours on the whole program (yeah, that's
- because I have never programmed before, and don't even know BASIC),
- while it took me no more than a hour to read each section in the text
- book. Finally, on the day of the test, there was only 4 probelms out
- of like 30 quetsions needs to find the area under curve (not to mention
- that find error of trap/simpson's rule was not even on the test).
- And all of them are not very complex, but I did them by use the programs
- anyway. Then, I use the extra time did the Bonus problem, and gone back
- redo those 4 problems by hand to show some work.
- I can't say that 20 hours of programing time was wasted, since
- I had gain insights of programming. However, had I not had that program,
- I could also done the test questions by hand, and do just as fine(but
- it will take like 5-10 extra minuate, plus I can't be sure if I did it
- right or not:). During the programming, I had to keep look back at
- the text book in order to get the algorthim right. So later, I even
- rememberd all the formulas because of the extensive reference checkings.
- The reason taht some professor/teachers ban graphing calc's is
- probabely they are
- jealoused about today's technology while back in their day they had
- to do lots of memorization, carry a big log/trig table with them:)
- But, I don't see any point to do all those # cruching to find area
- under curve when I have a graphing calc to do it and I know how to
- do it with my hand. After all, if I can do an indefinate integral
- in 5 sec by calc and you can do it in 4 min by hand, which one is
- more efficent in real lab works? If those guys still want ban
- calculators, they should ban the scientic one's in elmentary school
- or secondary school. I had a guy in my algebra class who
- forgot "what's 3*7" on a test, and all these 12th graders in my speech
- class who all need calc's to add 12 2 digit #'s (their speech grade
- by the class). Face it, even AP exams are going to allow grahing
- calclators in 1994(though they are going to clear all the memory,
- sucks! what happend if I have a TI-81 which can't link w/ computer?
- or I have a Ti-85 but don't have the Link-85, etc)
- By the way, one more examles for those guys who think Graphing
- calc can "can grah a function very fast, thus gaing advantage on exam".
- I was try to graph a function on one of my clalus test, which I try
- to find the max point of the graph. It took me a while to just type
- the equation in and check them(since the TI doesn't have the equation
- writer on HP, it's very easy to make a mistake). It took another 5
- min to do the zooming/range, etc. I spent about 10 min on that problem,
- and discoverd later that I could had it done in 3 min by take it's
- 2nd derviative. I think you got the point.
- That's all.....
-
- Ming
-