# Recent content by karen_lorr

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

You’re probably right about the rose. But let’s say each petal opens from the centre with a force of 123kn (very strong roses). There are two petals each pulling with the same force. The cotton is not massless (as infinite acceleration hurts my brain), so let’s say it has a weight which is so...
3. ### 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...
4. ### 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...
5. ### 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...
6. ### I Turning radius of curved plane on an inclined plane

I'm sorry but that's not correct. I am trying to introduce something like tan = v 2 / g r (banked turn) - of course I have left out F (friction) but if I can include this it go a long way towards what I'm looking for
7. ### I Turning radius of curved plane on an inclined plane

Yes I have. This is just one of the many sites I've seen that seem to me to have got it wrong. On that site there is a section called "Force Balance For Skier Going Around A Purely Carved Turn" But that is looking at this as an inclinded plane whereas it's more in line with (for example) a car...
8. ### 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...
9. ### The physics behind the Dew Point phase shift

I know that at a certain saturation vapour pressure the gas will shift to liquid. What I'm trying to work out is why? There must be something going on with the molecules - I think it may be down to their speed (maybe they slow down and at a certain speed they can't rebound so much - but that...
10. ### 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...
11. ### The first law of thermodynamics and the dry adiabatic lapse rate

Thank you. You have explained it wonderfully.
12. ### The first law of thermodynamics and the dry adiabatic lapse rate

Hi Thanks for the answer. I am trying to understand exactly what is going on. If no heat/energy is lost to the environment, then (I can't think of another way to put this) where has it gone? I assume the net temp (avg kinetic energy) is still the same - as no energy has been lost. So is it...
13. ### 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...
14. ### Why is white paper white and not black

Right let’s see if I have this. Light is always additive. When all the colours are added you get white Non light source objects (with a very few exception) are always subtractive. When all the colours are subtracted you get black. So if I shine a light onto a white object all the...