Rob, Shouldn't have mailed your response to the list just yet... I started to get some private replies with the guesses for the answer. I was beginning to feel tempted to take score and post it to the reflector after a bunch of replies came in... Anyway, you are correct. I might just add, that the speedometer may not even have to be mechanical to exhibit this effect. Think about how an electronic one may work. It would have to sample at least two samples of whatever part's (drive shaft, etc.) position it measures with respect to time. Then it has to do some calculation to display the number as the speed of the car, which also takes time... Of course they could also put a magnet on the moving part and a coil next to it and measure the voltage it generates as an analog signal that is proportional to the speed of the car resulting in a real time readout. But even then we would still have the mass of the needle to deal with... Regarding the rest of your writing, and the laziness of students, I agree, there is a problem there too. We ALL have our share of strengths and shortcomings, and I didn't mean to point my fingers at the professors alone, because I have met very good ones too in my life. I feel I had to mention this before it got too late and the mud began to fly around... Arpad =================================================================== -----Original Message----- From: Rob Szalapski [mailto:Rob_Szalapski@xxxxxxxxxxxxxx] Sent: Wednesday, January 30, 2002 12:17 PM To: arpad.muranyi@xxxxxxxxx; 'Si-List@Freelists. Org' Subject: RE: [SI-LIST] Re: HSDD: Re: SI Position Open READ THIS!!!! You have me curious about the clutch. Here is what I think. Most mechanical automobile gauges have some type of mechanism that involves a spring and something that opposes the spring, like an electric magnet operated by a spinning cable. If you were to accelerate really fast, like you are describing, you should expect the needle to overshoot the correct mark by a significant amount, then oscillate about the equilibrium point, the gauge being almost unreadable. To correct this you overdamp the system so it relaxes exponentially to equilibrium. Your car is fine; Newton is fine; your gauge has a delay. I would hate to think of that during an interview. By the way, I am a high-energy particle physicist/theorist, though I did spend a lot of time in a chemistry lab when an undergrad. I do software these days -- pays better than quantum field theory. I have tutored, TA'd and taught many courses. The problem is not so much the curriculum, but the quality of the students. Good students are curious and go looking beyond what is required. Most are lazy and do nothing more than what is absolutely required. Students should learn theory in the class. Then they should work with a research group in the lab on the side and try to do internships in the summers. That is the only way to cover all of the bases. I worked as an undergraduate RA in graduate research labs while I was a student, and that is just part of the experience. Any decent engineering department should be working hard to get students into internships and/or labs. Unfortunately it is very hard to get good students these days unless you are in the school of business. There you can be lazy and only marginally intelligent and still make much better money than a hard working, very intelligent engineer. (It's even worse for research physicists!) -- Rob ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu