Recent content by nobahar

Hello, I have found this chemistry equipment, but I cannot determine what it is for. I have a suspicion it is for measuring boiling point temperature elevation. I have included a drawing of how I think it should go together. It consists of a conical flask connected to a graduated boiling tube...

Hello, I am trying to understand an equation from the textbook "Theory of neural information processing systems" by Coolen, Sullich and Kuhn. The book states that "the evolution in time of the postsynpatic potential V(t) can be written as a linear differential equation of the form: \frac...

Regarding x=0: Thanks qwerty, I didn't notice that; I need to be more careful. Regarding differentiability: Thanks for the information; I'll need to go and look into that a bit more as I am not that familiar with it (I vaguely remember something about it...!).

Thanks for the response, RUber. I never thought of doing that; I guess if you know that the function is monotonic, then that would be a quick way of identifying whether it is increasing or decreasing. I wanted to identify if it was also monotonic. It is reassuring that both methods agree that it...

Hello, The equation is from a chemistry calculation; the textbook claims that the function is monotonic, without specifying whether it is monotonically increasing or decreasing. Depending on the starting conditions, the function can look different; I basically want to know if the following is...

Thanks for the reply Borek. I assumed this might be the case. This relates to the point I made earlier regarding the theoretical "infinite resistance" of a voltmeter: in that case, there wouldn't be any change, but an "attempt" to change is present. In reality, something is changing at the...

Thanks for the response Borek. I found some useful sources which I will try to add when I can access a computer. Doing it on a tablet is difficult. Just briefly, let's say hydrogen ions, or as some sources suggest, sodium ions cross the glass bulb (if, incidentally, hydrogen ions do cross the...

Hi Borek, Apologies if the post was long, but I believe there is a lot happening in a pH meter. Basically, I want to know how a pH meter works. I can't find an online source that goes step by step, without making assumptions about the readers knowledge or omitting important information. I...

Hello! I have a question concerning the functioning of a pH meter. All the sources online that I can find either omit, I think, important information, or describe it in "technical terms" with equations. I would like to know what is happening at the level of the distribution and movement of...

Don't worry: If the distance doubles as time doubles then the acceleration would have to be zero, since the average velocities would have to be the same. But the problem involves non-zero velocity, and so the distance does not double as the time doubles. Kind of obvious and I completely missed...

Thanks for the replies. I am not sure if it is an error in the book, but perhaps the acceleration is not constant and the relationship is simply |v| = kx and I do not need anything more "fancy" to solve the problem (such as differential equations), I might be neglecting something obvious. The...

Hi Orodurin, thanks for the reply. The chapter concerns kinematics with either zero or constant acceleration. It doesn't even assume much familiarity with calculus so I can't see that the question would require one to solve a differential equation. That's why I thought acceleration would have to...

Homework Statement An object starts from rest at the origin and moves in the positive x direction. The velocity is proportional to the displacment. I am trying to find the equation linking velocity to displacement. Homework Equations Since the object starts at rest and then moves in the...

Thanks for the reply. I guess it's just an error in the textbook.

In the textbook the value from A to B is 8.8 m/s and from B to A it is 6.6 m/s. They give the answer as something like 2.6 m/s. I got 7.54 (to 2 d.p.): 40 m / [(20/8.8) + (20/6.6)] s = 7.542857143 m/s.