scilearner

Ok I see. Thanks everyone who helped Here is a picture I found that further helped me.

Hey thanks skeptic I did see 2 images then. I think then if both eyes look at the same spot, it is possible to easily merge the two angles into one picture. However I suppose the brain has evolved to do this. A simple yes or no would be nice. What I'm thinking is their some physics principle that if two different angles concentrate on the same spot, they add up, or has the brain evolved to do this? Thanks

Hello everyone, If we have 2 eyes how come we don't see 2 objects. Then I found the answer was binocular vision, and both eyes concentrate on the same spot. Now my question is does the brain make the 2 different angles into one object or it always happens? I mean does something have to be done from the brain to merge these 2 views? Also I would like to know more about how the different view merge. Thanks

Hey I have a new analogy. There is a hill, the bicycle is going up (charge) and chain is moving (electrons). Ok due to electron movements,very small speed(the charge is pushed along, so it is like the chain meaning it itself doesn't travel the whole distance in quick time, but like spins along, or pushes the charge along), the charge(the bicycle moves). If there is a movement of something there must be energy expended. So that is voltage. Did I get this?

Thanks swansoft I have seriously confused the wiki articles. I typed in google hydrostatic pressure http://en.wikipedia.org/wiki/Fluid_statics and this article came and then I quickly skimmed to the hydrostatic pressure section. Now I read the first line in the article Fluid statics (also called hydrostatics) is the science of fluids at rest Sorry I really missed it Merged post follows: Consecutive posts mergedHey but this topic is not over yet!! If the answer to this question is yes I will understand what voltage is. In a circuit with no resistance and energy loss. The positive end is A and negative end is B If find the number of electrons travelling in the whole circuit at one point in time. One electron would take a long time to move from A to B so what I mean is all the electrons in the circuit from A to B in an established current.Then add all their kinetic energies up that should equal to voltage. Is that right?

Hi swansoft Wiki says Hydrostatic pressure is the pressure exerted by a fluid at equilibrium due to the force of gravity Yes it could be the pressure generated by the heart here but may be I'm getting confused with the definition. Is the hydrostatic pressure only due to gravity, that is what wiki says.

I don't understand, how can hydrostatic pressure drop along this vessel, if gravity is always acting, even if molecules lose energy they will get it back from gravity.

Hey thanks ewmon for the detailed response. I appreciate it. Going back to that people in the room and opening the door analogy. When you open the door and some molecules hit,collide (call these A) and send some molecules through the dooor (call these B). Then molecules at A have lost momentum, meaning pressure, is this what happens along a pipe. Your room analogy is the one that is the easiest for me to understand. "If hydrostatic pressure in a pipe is acted upon by resistance, how can it ever be zero if hydrostatic pressure is due to gravity and gravity is always there." I'm asking this as a pressure question. I mean in a pipe if hydrostatic pressure is acted upon by friction, wouldn't it regain the energy because the gravity is always acting and it would give it back.

Thanks swansoft for the help For the first question what I mean is even if pressure drops to zero gravity would give some energy again, the force is always acting. For the second one ok if a collection of molecules (A) hit another collection of molecules(B) and make them move along the pipe. A would have less energy, I consider A as the molecules providing hydrostatic pressure, so if that drops what happens B(kinetic energy molecules) hit A can it gain hydrostatic energy again. Thanks

Hello everyone, If there is a pipe and it has a certain hydrostatic pressure and then goes through a region of high resistance. Why does the pressure drop? If hydrostatic pressure is due to gravity. Gravity is always there right? Momentum, So in the pipe when the molecules are moving. The hydrostatic pressure is converted to kinetic energy. Hydrostatic pressure molecule, hits another molecules and it goes flying, while reducing the pressure of the hydrostatic molecule. My question is can't the molecules that are moving (kinetic energy) collide and give back the lost hydrostatic energy? Thanks

Thanks again for everyone who replied I'm still trying to get this. Ok I can sort of understand how pressure would drop when there are resistors, let's say the same circuit I mentioned with no resistors, then is there no pressure drop along the wire. Resistance decreases current. So when the current is established why is it slow (ok constant but slow), in the pressure circuit above. If there is a circuit with no resistance does the voltage drop or not? Does the voltage and pressure always drop? Ok can anyone explain pressure drop in molecular level to me. p=120------------------------------------------------------------------p=0 Ok now if the pressure drops, how does this happen. The molecules bound off each at the start and then move, then why does the pressure drop along? How can relate this to voltage drop? Is flow and diffusion the samething in this case. Is that why molecules are flowing, are they simply diffusing. If they are diffusing why do they diffuse along a gradient? Ok can anyone explain pressure drop in molecular level to me. Edit: Another question raised just now. If hydrostatic pressure in a pipe is acted upon by resistance, how can it ever be zero if hydrostatic pressure is due to gravity and gravity is always there.

Thanks for the reply swansoft Could you please tell me how exactly does a resistor slow the current using pressure analogy. Thanks

Thanks a lot for the reply All though I'm still uncertain about some bits (not your fault) in general I found the response very helpful. Continuing on that exit door bit you mentioned, is that the reason pressure drops, as more and more people exit. Could you further explain why pressure drops along the tube using that analogy. Thanks

:-)Hello everyone, First of all I have to say I never understood what voltage is? So this is my final hurrah at understanding this I'm hoping to understand this using pressure analogy. Pin= 120 mmHg -----res1-------res2---Pout= 0mmHg This is the circuit. Now lets think water is flowing. Now I want to know when water passes through the resistor 1 and resitor 2 why is the flow rate the same. I mean if res 1 slows down water, then res 2 should slow it down further.Why is it constant? The way I have come up with an answer is like this, please tell me if this is right. Water has 2 energies = Hydrostaic pressure energy + kinetic energy pressure. So each time the resistor only loses the hydrostatic energy of the water so flow remains constant. Now I don't know how to transfer this analogy to electrons, is it the same thing, does electrons also have 2 energies like this. Also one last question. Why does a pressure gradient make something flow, is it simply that 120 mmHg pressure side in this case has more collisions, and molecules simply move due to these collisions? I know voltage is electrical potential difference between 2 points, but why exactly does this make electrons move? Do they move due to the collision like water or due to opposite charges attracting the electrons? Thanks

Hello guys, This is what wiki says, Now why do they say it is amplified by chronically low insulin levels. Hormone sensitive lipase which breaks down Triglycerides is inhibited by insulin. Lipoprotein lipase which breaks down Triglycerides is activated by insulin. Since insulin level is low in this case, how does low insulin levels increase TG level, it should decrease it right. The only way I could see TG increasing is excess Acetyl CoA turned TG. Your help would be much appreciated. Thanks

Thanks Greippi, that's what I was thinking but you confirmed it. I have one quick question. When the DNA is double stranded, does that mean it has 2 separate helixes joined, or one long helix interwined to make 2 helixes. What I mean if it is former if you are unwinding the DNA helix, you have to keep one dna strand under the other dna strand to find the length, if the 2 dna strands are separate. I hope you understand what I mean. Thanks

Hello guys, I have a very quick question. They say nucleic acids are very large molecules and they cover some large distance I can not remember. Are they saying the length of these molecules are long or the size(meaning they are big with width). I don't understand how they can fit in a cell if they are that big. I can understand how they can wind a lot inside a cell, but that only explains the length. It is those trivia like things where they say this can cover the size of a tennis court and such things. Just give me your opinion. Thanks

Thanks swansoft Why does pin hole block rays off axis? I mean light still has to pass through pupil, so isn't it the pupil that can block this?

Hello everyone, Why do looking at things with one eye closed through a small hole like microscope make the object look clearer. Someone told me it gives less abberation. Then I checked it online and it said different wavelengths converge at different points in a lens. Ok I understand why that would create a blurred image, but I don't understand why looking at objects as the way I describe create less abberation. Thanks

Hello everyone, This a question related to ATP pump that uses electrochemical gradient to provide energy to make ATP. I have few questions about this. 1. In an electrochemical gradient there are more positively charged ions on one side of the membrane(In proton gradient case). So why do the protons move from highly concentrated area to low concentrated area? Is it because the side that has more protons repel each other and eventually push the protons away until the charge is neutralized? 2. If there is a higher concentration of ions in one area why do they move to the less concentrated area? Is it because higher concentrated area has higher pressure so they move to lower pressure area, because that side provides less impedance. 3. Now what exactly gives the energy for the ATP pump. Is it the movement of ions. Is it using the kinetic energy of the movement of ions across a gradient to produce ATP? If so why does it need a proton gradient, ions are moving all the time randomly even without gradient? Does the gradient give it a direction or something that can be efficiently utilized the pump. Thanks a lot for anyone who is going to help. Thanks

Hello everyone, I know the pressure at bottom of atmosphere is higher than above. Then when I suddenly heat up air at the bottom of atmosphere why does it rise? Ok if it is buoyancy, why doesn't the air at the top fall down towards earth, because they are less dense so they must fall right? I can understand how a small leaf can float in air but how can the medium itself float up? Thanks

Thanks Skeptic Ok so if I get a water bottle, are the molecules at the bottom travelling towards the top because of the pressure difference? So then if I submerge an object with large volume, it will displace water to a greater depth, hence it has to overcome a higher pressure difference to sink. Is that what happens. EDIT: Now I'm getting confused. If there is water in cup. At the bottom the pressure is higher and at the top pressure is lower, wouldn't this create a buyoncy force and raise the water molecules at the bottom to the top. Why doesn't this occur? When you displace water molecules do they follow this gradient to push back on the object?

Hello everyone, I'm bit confused about buoyancy. First of all I want to know if it is newton's third law, filling a vaccum or none of above. For example these are my 3 diffferent understandings of what buoyancy could be. Which one is right I fall on water and diplace water molecules, do the water molecules give a reaction force back on me calling buoyancy. If that is the case why is it not Newton's third law. when I displace water molecules, water molecules from underneath come to fill the vaccum and push me up(especially when you displace air isn't this what happens). Is this buoyacny? Thanks

Hello everyone, I always though when reactants are heated up, there are more collisions and more like a reaction is to take place. However this is not the case for spontaneous reaction according to Gibbs equation. Why is that? Thanks

Thanks for the reply Skeptic said that you don't need charges to create an electric field. Wiki:electric field is a property that describes the space that surrounds electrically charged particles or that which is in the presence of a time-varying magnetic field. So is charges involved or not in this. EDIT: If light is an oscillating electromagnetic field? How is the electric field it oscillates created?