Reverse Definition and 296 Threads

i am connecting a wire to a battery and i pass current in wire and so battery will be charged.suppose if i change the direction of current then will the battery charge? i.e if i change the direction of current alternatively after some time? why i am confused is because of this? suppose if i...

Homework Statement The work function of caesium is 1.35eV. A photoelectric cell has a caesium surface and is illuminated with monochromatic light of wavelength 400nm. What reverse potential difference must be applied to the tube to just stop a current passing through it? Homework Equations...

Is HP the only company that sells calculators with RPN? Why is the HP-12C so expensive? It doesn't look expensive. I was wondering if it was possible to get a small pocket calculator that used RPN that wasn't too expensive?

Homework Statement A heat pump is used to heat a building. The outside temp is -5.0 Celsius and the temp inside the building is to be maintained at 22 Celsius. The pump's coefficient of performance is 3.8, and the heat pump delivers 7.54MJ as heat to the building each hour. If the heat pump...

In an Excel group someone connected with the Texas caucus gave this math problem> how to subdivide the following set of precincts into subsets so that there are a maximum number of subsets from this set with each subset of precincts totaling at least 180 votes. Since the caucus is this month it...

I am to give my first physics talk for a seminar class next week and I am looking for info on recent research done on the reverse diffraction phenomenon. Any links or thoughts would be appreciated. (Credible sources only please, as this is for a class).

http://www.independent.co.uk/news/science/scientists-discover-way-to-reverse-loss-of-memory-775586.html

So would more copies of the SIR6 gene help reverse aging or anything like that if it's possible that deletion of the SIR6 gene speeds up aging a large amount? How dangerous would it be to have more copies of the SIR6 gene? If the mitochondrial theory of aging is correct, is there a way to...

I'm using windows XP and I'm trying to reverse the system restore I just did. I've tried undoing it, but my comp just keeps saying its unable to undo the system restore. What do I do?

http://img151.imageshack.us/img151/1953/51953732lu5.png In this case, is the reverse breakdown voltage at V = 0V since there is negative voltage?

1. there is such a reverse bungee machine called the G-max Reverse Bungee in New Zealand and Singapore. Basically it works by attaching a car to two stretched giant rubber bands, then releasing them from the ground, so that it rockets up (to 60m), quite like reversed bungee jumping. it claims to...

4. The enzyme reverse transciptase is critical for? A. converting the RNA genome of a virus into the DNA form of the host cell. B. converting the RNA genome of a bacterium into the doble stranded RNA form. C. replacig the uracil with the thymine in DNA strands. D. replacing the broken...

Homework Statement (x^2+3x-1)/x^4 the answer is,(-x^-1)-(3/2)(x^-2)+(1/3)(x^-3)+CHomework Equations Just reverse diferentiationThe Attempt at a Solution =x^2+3x-1+x^-4 =(x^3)/(3)+(3x^2)/(2)-x+(1/3)(x^-3+C) (1/3)(x^3)+(3/2)(x^2)-x+(1/3)(x^-3)+C I know i got the answer but somehow it is...

hi can you please tell me what is reverse electromagnetic force? thankz!

"reverse pitot" if one reverses the direction of flow in a pitot measuring system (i.e the pitot tube doesn't face the flow), will there still be a difference in pressure between the pitot and static tube ?

Homework Statement I am trying to finish the equation, to compare it against a set of data so I can then find the accuracy of my results in relation to the equation: I(dark) = I(sat) * e(qV/kT) -1 I have the following data: Va - the applied (bias) voltage q kB - Boltzmann Constant...

why do mirrors reverse left and right but not up and down? thank you very much. Ryan.

Hi, I really want to know if there is a way to do detection whenever wire been reversed between Life and Neutral. Any opinion guys?:smile:

I've become fascinated by the prospect of using reverse time dilation as a means to achieve a "holy grail" of computational power. I'm probably going to get knocked down by not explaining this right (I haven't studied SR yet) but please try and understand what I mean. If a computer was...

I know the following ion/inside cell/outside cell Cl- 5mM 150 mM K+ 130mM 5mM Na+ 20mM 140mM Ca2+ 10^-4mM 2mM How would I find the reversal potential for conductance equally permeable to sodium and potassium? How do I find the reversal potential for a conductance equally permeable to...

Hello everyone, Here's my question. We have a reaction with an overal enthalpy change of -66KJ. The activation energy is 7KJ. We want the Ea for the reverse reaction. Formula: Ea (rev) = ∆E + Ea (fwd) So I wrote: Ea (rev) = -66 + 7 = 59 KJ. But the corrected exercise says: 66+7 =...

If it is thermodynamically favored for a reaction to occur forward and reverse, does that mean that the standard enthalpy of the reaction is close to 0?

http://www.latimes.com/news/local/la-me-ocean30jul30,0,7764272.story?page=1 "...In many places — the atolls of the Pacific, the shrimp beds of the Eastern Seaboard, the fiords of Norway — some of the most advanced forms of ocean life are struggling to survive while the most primitive are...

Thank you for your insights on this. Suppose our kitchen table has a double glass top. Here and there it produces Newton's rings type interference patterns. I understand that by reverse transforming an interference pattern you can recover an image. If I were to somehow do this...

Im working at this at the moment on this and i was wondering if is posible to reverse polarity of a permanent magnet without expending huge ammounts of energy and keep that polarity

Johan Noldus is an interesting "outsider" figure on the margins of QG. This thread (if he happens to come across it) will give him a chance to make himself visible to us and to discuss his approach to QG---which he asserts to be radically different from that taken by the other efforts to put...

I built a computer in my car, mainly for navigation and mp3 purposes. I would like to display song/artist information to the OEM LCD screen. There is a one wire bus in a wiring harness that carries data (track name, artist name, XM channel) from the XM tuner to the LCD in the dash. I'm...

Hypothetically, if someone built an antigravity generator out of an exotic material that warped spacetime in an opposite way, so that matter was repelled instead of attracted, would the passage of time speed up for that frame of reference? I'm not a physicist or physics student, though I am a...

So, we are just starting ABEL... and I don't quite understand reverse polarity usefullness or application. Here's the extract from my textbook (Wakerly, 3rd ed.): "In this example, the reverse-polarity equation has one less product term than the normal polarity equation (whatever...the...

If a mirror reverses left to right, why doesn't it reverse top to bottom?

What would be the effect of an increase in temp on the rate constant of a) the forward reaction b) reverse reaction and my second Q is..why is it important to specify the temp when giving a value for Ke? Thanks

Hey , I still do not understand how to determine the activation energy for the reverse reaction when you are given the activation energy for the forward reaction and the delta h for the reaction. I was told to draw an energy diagram but I think I am drawing it wrong. I do know that the...

Piezoelectric Crystal Vibrates When Subjected To An Electric Pulse , Now I Wonder If Putting Stress On A Piezoelctric Crystal Would Yeild An Electric Pulse ?? And If That Is So, Are There Any Machines Based On This Theory ?and If There Are ,how Efficient Are They ??

Hi guys… there was a lot of arguing in my class when my teacher gave us this one assignment question that I’m not too sure about. It goes as follows… A Polar Lander somewhere above the surface of the Mars is landing with a deceleration of 23m/s^2. If the Lander itself had a mass of...

Is it possible to start with the Lorentz transformations - I mean the whole Poincare group SO(1,3) - and derive that there exists an invariant speed? Is this a known derivation? I suppose we could assume a "flat" manifold with metric Diag(1,-1,-1,-1,).

The game of reverse Tic-Tac-Toe, called Eot-Cat-Cit, has the same rules as Tic-Tac-Toe, except that the first player with 3 markers in a straight line looses. Can the player with first move avoid being beaten? (note: a tie counts as a win for player 1)

If time were to go in reverse, how exactly would the universe, and humans act? For instance, humans can think and be conscious while time is pointing in a forward array, but can humans be conscious while time is running backwards? That is what one would think, right? Would mathematics have to...

I have an equation, that I used in a software I made (Delphi). Now, I want to sort of "reverse" this equation. Y = 0-((( ClickedY * (1800 / PicHeight ))*2)-1800) X = (( ClickedX * (1800 / PicWidth ))*2)-1800 What does ClickedY = if you know Y and the PicHeight? what does ClickedX = if...

Someone mentioned this web page tangentially in a thread in Skepticism & Debunking, but it deserves its own thread here in GD. http://www3.telus.net/jefmil/stairwaybackwards.htm Everyone's heard the claim that certain songs contain hidden messages if played in reverse, but you (or at...

In a low key admission, Bush officials are allowing that they were wrong in their summary dismissal of man induced atmospheric warming. link:www.nytimes.com/2002/06/03/science/03CLIM.html

If I understand it correctly it is possible that due to relativistic effects, 2 events A and B may be perceived by one observer as A happening before B, while for another observer B may happen before A. Can someone give a layman explanation of under which circumstances this would happen (i.e...

The big news of the day, seems to be that tanning beds have addictive properties. Clients choose tanning beds that have some UV light to offer, because it gives them an "addictive", sense of well being. The real news is this. Due to scares regarding skin cancers, and due to the fact that...

(Sorry, I'm testing with the 'tex' code) Reverse Gravitational Force is the opposite force of Gravity. It is it that keeps two bodies from not moving EXACTLY into the areas given by F=\frac {G_m_1_m_2} {r^2}... You can test it by using EXTREMELY precise instruments, and checking if an...

Help with reverse siphon break? Hey there, Not sure if this is possible but... I was wondering if there was a way to set something up so that one liquid would siphon into a lower container and stop when the liquid reached the level of the tube opening without using any sort of valve...

Ok, is there any solid, liquid, or gas that becomes heavier as it gets warmer and lighter as it gets colder? Like a reverse lava lamp. The little physics I know says no but I Know VERY little, you know? CJ

This is not a homework question but I am posting it here because I think it may be too basic for the other forums. I am looking for a ray diagram for a reverse galilean telescope (ie. + eyepiece, - objective, so image is minified). Can anyone describe what the ray diagram would look like or...