# Search results

1. ### B Is non-linear Tension Force possible?

I seem to remember from my school days that Tension Force can only be linear. Is this true? In 1 (in the graphic) the tension will follow the line of the rope In 2 there is an unbendable, unbreakable, steel cable formed into an arch. a ] In 3 which direction will the Tension be? b ] In 3 if...
2. ### I Horizontal Tension Force equation

(not a homework question - I left education over 45 years ago) Hi, this just out of interest as I have been googleing this and can't find the answer I know the equation for tension force, for example a weight on a string, block on a ramp, etc. But is there something similar for a horizontal...
3. ### I Maths required for rotation point

Hi The first thing to say about this is that I don’t have a clue where to start. What I’m looking for is somewhere (maybe a website or just a brief introduction) I can study – and learn – about the forces involved and the maths required. _______ Say I have an item/length/beam/weight/etc (C...
4. ### B Rotating line - x axis point

Hi (I hope this is the right place to post this - sorry if it's not) Say I have a line (in the graphic is shown a 10mm but it could be any length) and it rotates around a point at one end. What is the formula to get the length along the x axis directly under the other end of the line. In the...
5. ### I Turning radius of curved plane on an inclined plane

Hi again. I hope this is the right section to ask this question. Not home work (I'm retired) but yet another mind game I'm playing (and still getting nowhere). I have trying to work out the formula for how a ski will perform a carved turn. I have looked at many (many Many) websites and they...
6. ### The physics behind the Dew Point phase shift

Many websites gives the results of Dew Point but not the reason. What is going on at the dew point? Not the result (at a certain VSP vapour becomes liquid if it can find nuclei to coat) but the reason for the result. I have been reading up on this – just out of curiosity – and would like...
7. ### The first law of thermodynamics and the dry adiabatic lapse rate

Say there is a parcel of air rising and cooling, what is going? Is it that the net kinetic energy (Temperature) of the parcel is distributed over the (new and larger) area/volume? Or Is it that the parcel is undertaking work as it presses outwards and so looses a corresponding amount of kinetic...
8. ### Why is white paper white and not black

Why is white paper "white" and not black I understand this may seem a silly question but I really would like to know. As far as I understand it (may be wrong) additive colours (visible wavelengths) when combined equally produce white. Subtractive colours, when all the colours are equally...
9. ### Do photons oscillate?

OK I understand it’s a silly question but I have been thinking about this all day. Say you have an EM wave moving out from its source in a transverse wave formation. Where does the oscillation come from? And (another silly question) is the oscillation affected by mass? In my simplistic...
10. ### UV light absorption by transparent sheets – how?

Ok thanks for the responses to my other question; I think I now have it. I have a follow up question – that is almost on the same topic (but not quite) The complete spectrum (arund 200nm to 380nm) of UV light is absorbed by some plastics?? Elections will be moved to a more energetic orbital...
11. ### H2O Vibrational Transitions (molecular as opposed to election) Why ?

Good morning. Yet another question ;-) I have been looking at so many websites and I still can’t find the answer, so if anyone could give me a simple explanation, or give a link to a web page, it would be really appreciated. Visible wavelength selective absorption/reflection. Water is blue...
12. ### Refraction and splitting of a photon

I wonder if someone could help with me with this. I understand Snells Law and I can also work out various refractions in different media by using C. But “why” does refraction occur. Every website I look at (inc Wiki) gives the results of refraction (e.g. Snell’) not the reason. They will...

Thank you
14. ### H20 Molecular shift - what is the initial state just below the Dew Point

Hi all Another question (sorry) Water vapour in the air will phase shift back to liquid when it reaches its Dew Point temp (Partial Pressure = the Saturated Vapour Pressure), OK I have this. For this phase shift I assume that there are Condensation Nuclei and these nuclei are at a lower...
15. ### How many molecules make a droplet

Hi I am just wondering about this. How many molecules does it take before you can use the word Droplet in the atmosphere? As an example, one H20 molecule floating around (interacting occasionally with others, but generally just floating around) would be Vapour. If two H20 molecules...
16. ### Energy convertion - kinetic to heat

Hi All I am stuck with this (Not homework - jusrt writting a paper, well trying to anyway ;-) I wondered in anyone could offer some advice or a link to a webpage with more info - I have googled this any can't find anything for days. I am trying to discover how kinetic energy would be...
17. ### Molecular phase shift in a non-enclosed area – how ?

Hi I have read this and to put it mildly I am confused, so maybe someone can clear this up. The dew point is defined as the point/temperature at which the Partial Pressure of the water vapour within the air packet equals the Saturated Vapour Pressure. I understand that the dew point is a...
18. ### NOT homework - where would I get an apprisal on a physics study

Hi I am not in education (haven’t been for the past 30+ years) and I don’t know any physicists. I have called the local college but they said they are too busy. (asked in the physics section as my study is the physics of weather / ice - I hope this is OK) I have been working, for the...
19. ### Molecular work in an Adiabatic process ?

Molecular "work" in an Adiabatic process ? I have studied Adiabatic cooling in connection with a rising parcel of air. I’m confused. I understand that temperature is a macroscopic principle (not a Microscopic); molecules do not have a temperature, only velocity and Kinetic energy. I have read...
20. ### The physics behind the Le Chatelier principle ?

Can anyone explain the physic behind the Le Chatelier principle ? I know the gas will expand to fill an area but why ? If I have a box full of air (just normal air) and I enlarge the box without allowing any more air in, the air will spread out to fill the larger box. What starts this...
21. ### Boyle's Law, does it hold true in a non finite container ?

If a gas will expand to fill the available space (container) does this still hold true if the "container" is the atmosphere? Assuming the gas(es) can escape (either in molecular or in subs - atoms) from the area around the earth containing our atmosphere this means that the gas is not...
22. ### Where do electrons go (?) within a covalent bond

"Where" do electrons "go"(?) within a covalent bond If you take a water molecule (H-O-H) with 2 covalent bonds (imagine, just for now, that this is the only 2 atoms around ;-). The H’s electron and one of the O’s electrons (within the covalent bond) must be “somewhere”. They were...
23. ### Hydrogen bonding and Oxygen electron count ? (how)

Sorry to butt in on your form. Please can someone help me with this – I’m sure it’s simple to those who know but I have been thinking about these 2 problems for ages (and reading up on every website I can find) and still no answer. I am trying to get a basic understanding of this and seem to...