Xittenn

I think the argument has changed though, from this statement of "the velocity v never actually attains zero", to "well maybe we might define a body in motion as having velocity or having acceleration at any given moment, or both". I hadn't seen it like this before, until Swansont brought it up. I kind of like the idea because we would then define the body as being in motion at its first instant of a force being applied from rest. We could also then say that a body remains in motion as it is accelerated through zero. These statements seem perfectly logical to me, and I don't see why we couldn't use this as definition. I think however, that the ambiguity should be removed from the definition; although, that might be somewhat difficult as it would be a pretty massive undertaking. Is there somewhere where this is defined properly, and without ambiguity?

Just to be clear on my meaning I am saying that this: "He argued that since it pivots on a circular motion from the bottom that it didn't." -JustinW's friend Isn't a direct negation of this: "I had just had a discussion with a friend of mine about whether a piston's motion stops before it changes direction." -JustinW Unless of course it was intended to imply that as a consequence there would result an unbalanced force at all times. And I now see, as a consequence of Swansonts statements, why one might say that the piston does in fact not stop at the top of its stroke. well I'm contented : D

The OP was asking about a tie between circular motion and whether or not the piston comes to a stop. I still argue that the two are in fact not related, and that whether or not the piston is connected to a system in circular motion is irrelevant to whether or not it stops at its peak of oscillation. --edit-- made a comment not sure I actually understood what was being said, edited out

Yes, at time t, otherwise you have a non-linear discontinuous manifold and modifications would have to be made to its treatment.

A body in continuous motion doesn't stop, but the body that you are refering to is not in continuous motion because it does. The only state that this body is continuously in is accelerating.

In a system that is in a continuous state of change, no event is incurred over a period of time. They are incurred as instances, and occur at specific times. We might say that at some moment the piston achieves 1 m/s. We then say the piston achieved 1 m/s at time t. We don't say that the piston was traveling at 1 m/s for a time because it is in a state of change, and the velocity achieved is instantaneous and only exists for a moment with no relevant duration. You can magnify the event as much as you wish and analyze the precision to as many decimal places as makes you happy. I'm sorry I missed Swansont there . . .

I'm sorry I do not understand what you just said.

If it didn't attain a speed of zero at all, then there would be a change in velocity [math] \Delta \nu [/math] in zero time [math] \Delta t [/math] such that the resultant energy required to perform the work necessary to achieve such an event, would be infinite.

My analogy to your statements. First find a train track. Mark an 'instance' on the track. Now drive over it really fast with a really fast train. Does the wheel ever make contact or drive over the mark? According to your statements, this might be questionable because the time spent in contact might be infinitesimally small depending on the size of the mark chosen, and depending on just how one would define an 'instance' and how you might mark that. Some might try to use this sort of statement to say that the train never really made the trip at all, and that the train in fact merely appeared magically at its destination. I don't believe in magic, so I say the damn thing happened. The point here is, either we have a smooth manifold and we pass through all points, however unequally and however briefly, or we have to further explain a set of non-linear behaviours. In operation you will see the piston slow and then reverse its direction. The time spent at this fraction of the operating speed is enough to satisfy your flat sine wave argument for me because I rarely work in absolutes. That said you are obviously having trouble with this sort of mentality. Maybe you would like to attribute this behaviour of passing through a point, without passing through a point, to quantum tunneling? But tunneling is not something that objects of macroscale mass simply do on their own or even at all. So as it stands, if point B lies in the path between points P and Q then we say that an object traveling from point P to point Q passes through point B. We could further analyze the problem to deal with deformation as different points of the piston will be traveling at different speeds at different times. Sure we could analyze a piston as not being a 'rigid body' at all. But it does nearly operate as a pure rigid body, and being that I don't do work in absolutes I have no problem with this. I guess if you wanted to treat the piston as a fluid and apply fluid dynamics, all of our statements may need to be modified. If this was the method chosen to analyze the piston, then one might have to make a statement about the speed of the waves and so on and I think this might get pretty complicated. Can a fluid attain a uniform speed or a net speed as a single body? Sure. . . . . Could we make these statements about a piston? Good question! I really didn't understand your third statement. Also, keep in mind that I post answers for fun. I am not prepared for a battle about the de-factos and may very well crumble when challenged. I'm discussing, not debating.

In conventional combustion engines, yes the piston achieves zero velocity along its axis of travel. Given that the velocity is in fact zero, the speed is also zero. This is unlike the crank shaft or piston rod which has constant speed but varying velocity. In the case of velocity varying in direction, components of the vector can and do become zero. : D The piston rod is an ugly thing and I retract any mention of it. . . .

Given your statements previous to this comment I think you know the answer is in fact no. Circular motion can provide an indirect path to inverting the direction traveled by a mass. To linearly invert the direction of a mass along one axis in the objects local space, requires the object to--ideally--come to a complete stop before traveling in the other direction. I'm not sure the most appropriate way to phrase that, but I think when the language is used loosely, this is where people start to come up with their own personal meanings. Maybe another way to say this might be: Given a mass traveling with 'velocity', any component of the 'vector' where the direction of travel of the mass is inverted, will see at minimum, a momentary value of zero. This doesn't however assure that the mass will ever attain zero 'speed'. Another example of choice in wording is seen in iNows reply below. A ball thrown into the air begins accelerating in the opposite direction the instant the ball leaves the hand of the individual who has thrown it. Which is quite unlike a piston that accelerates down due to a chemical explosion and up again due to a circular acceleration. Forgive my post if it sounds obnoxious, or contains any misinformation! : D

DI.FM -- Dubstep

Why not plexiglass?

I just thought it was note worthy that there is current research into using the Hydrogen sorption properties of Titanium Sponge as an alternative form of storage. I'm not exactly sure where this fits into the grand scheme because the material I have read was all online, and the availability of this content and the readiness for Google to bring it up seems to have fluctuated. This was information that came up while I had previously been researching current trends in Hydrogen Fuel Cell deployment.

I had assumed other to mean alternatives. The only alternative that I could conceive of was, do it yourself memorabilia design kits. So basically, here is the design, now go do it yourself, ya lazy bum! : D

SFN rub on tattoos! For the kids, you know . . . .

1) I can't think of a language that does not allow for comments in it's specification. Comments are not however, placed into compiled code. There are ways to embed comments into compiled code. There is a special form of notes in some languages, libraries, or variants called annotations. Annotations are an active form of notes that can affect the way a program operates and is mostly used to help ensure correct program execution. 2) No! Notepad(Windows) files do not have a header that allows you to place a comment on the file. This is an awkward question because the explanation of all the different background and inner workings involves specifications created by both the file type creator, and also specifications created by the OS. 3) There are size restrictions on anything you do on a computer. Sometimes these only manifest as hardware considerations, where other times they are explicitly stated as part of a specification. I think it is safe to say that you will only encounter headers whose comments have a defined maximum string length. 4) Isn't this the same as asking questions #1 and #2?

I may undercook my steaks, but a lot of people overcook them. Steaks really do not need to be anything more than heated through, and a nice pink in the middle is usually ok for most people. I say this because thoroughly cooking a steak more often than not leaves it chewy and can affect the taste. I like mine blue because the texture is softer and the meat dissociates with a fresh musky flavour. Mixed with a good sauce, whatever fits the mood, and eating a steak becomes a very relaxing experience. Mood food : D

Someone must have the purchase order, or you must at least know the manufacturer name. I think you are oversimplifying your approach, and generally wasting your time by trying to preconceive a solution. All of the embedded systems I've worked with employed solutions that were significantly more complex than anything you have proposed or implied. This wasn't simply to exhaust all solutions, but was also necessary given the onboard controllers for power-on reset generation. Many of the embedded systems I've used have employed standard PCs that required additional hardware for this purpose. They often use a custom card that receives a signal and turns the PC on as necessary. The cards often include circuitry that will detect sudden drops in voltage and will additionally signal the PC and other controllers to act accordingly. Any oversimplified solution may be misconstrued as bad engineering. Also, this isn't my profession and my opinions come from experience with a narrow selection of system types. My experience is mostly limited to CNC and similar types of equipment. You haven't given any details about your project, and these details might be relevant in forming an opinion. The general lack of details surrounding your project might prevent others from having any opinion at all.

Although I am currently about 20lbs overweight, I don't believe in maintaining a strict diet. Most strict diets are almost impossible to maintain, and I really do not have the time to fuss about things that I can not control. For me maintaining a healthy diet is centered around controlling the quality of the foods that I eat. I avoid eating any processed foods, no processed cheeses, no boxed or frozen dinners, and so on. I don't however, avoid things like chocolate, chips, and ice cream. I currently have a plate of soft chocolate that I made from cocoa, sugar, and butter, sitting in the fridge and I am consuming it in bites. If I don't make it myself I go to a bakers, or specialty shops like Thomas Haas chocolatier. I most often snack on fruits, quality cheeses, and fresh breads. I really like olives. I eat meat a fair bit. Most of my dishes involve a cut of meat and some vegetables. I eat more meat because this is what I am attracted to. I feel most satisfied with what I have eaten when it involves meat. Meat with sauces that is. I like my salmon with hollandaise, lamb with chocolate raspberry, duck with a wine reduction, southern fried chicken with gravy and corn bread, and so on. I try to cook my meats as little as possible, but ensure that meats like chicken are cooked to safety standards. I simply sear my steaks on the stove and consume them blue rare. Sushi is also one of my favorites. If it's not a meat dish then it is a casserole or pasta. I try to make the classics like moussaka and dolmades, or lasagna. I can't believe how disgusting lasagna can be made, and how people order noodles with sauce from pizza shops and call it lasagna. Some of the best pizza shops make really terrible lasagna, and that said, I always order my pizza and do not bother to make it myself. Sometimes I will pick up a bottle of wine if I am making something fancy, and will try to complement the dish with an equally thought out dessert. I think if the concern is maintaining a diet to improve the quality of ones health, one should instead focus on incorporating more exercise into each and every day. I refuse to drive, I have never held a driver's license, and walk whenever I can. I try to keep myself enrolled in physical activities, either holding a gym membership, or taking martial arts, or whatever. I tend to take jobs where I am not sitting all day and where I am involved physically with the work I am doing. This last bit is about to change and I will have to spend more time in the gym.

Motherboard model #??

Would this not be caused by power-on reset? The reset is being held high, or on regardless . . . . . PoR generator