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  1. Puma

    I Is space compressible?

    I was asking some Big Bang related question on Reddit and someone replied "The big bang is an explosion of space itself. A shock wave requires an explosion propagating into pre-existing material. Not only was there no pre-existing material, there was no pre-existing space to hold it. This all...
  2. Puma

    A theoretical question about forces

    F=ma, in the two cases the mass is different, the force is the same, so you would get a different acceleration.
  3. Puma

    Can you combine two accelerations together?

    I think you'll have to post the original question to get a clear reply. All that comes to mind is that gravity had already, in some way, been accounted for.
  4. Puma

    How fillers are added to silicon fluids?

    Yes its right! You'll have to look up mulling paint I guess to get good info. But anyhow basically all you need to know is that powders have to be really finely ground into the carrying medium to disperse it evenly eg by hand with paint this equates to a flat stone, oil, pigment and another flat...
  5. Puma

    Double Slit Experiment: one at a time

    I think there was some experiment that managed to detect some perturbation at either slit as the electron passed and showed it does indeed only go through one slit.
  6. Puma

    How fillers are added to silicon fluids?

    It depends on what kind of silicon polymer you have. Usually they are gels or thick fluids which will hold onto suspensions. If it is a fluid it is a complicated but not too difficult subject. It depends on such things as the polarities of what you are adding and whether they are attracted to...
  7. Puma

    Flywheel for energy storage

    I would approach it as 3 concentric circles, calculate the energy of each disc and add them together. https://www.physicsforums.com/threads/rotational-kinetic-energy-of-a-solid-disk.181191/
  8. Puma

    How fillers are added to silicon fluids?

    Liquids are mixed with liquids, powders are often ground in, a process called mulling.
  9. Puma

    Double Slit Experiment: one at a time

    The gun isn't like a rifle it's more like a shot gun spraying the electrons out. As long as they get through the screen they will register. Particles this small are associated with having some wave form like properties. If you think of a small toy boat heading towards a slit with its own bow...
  10. Puma

    Integer solutions to ax^2 + bx - cy^2 - dy = 0

    Sorry I know the variables a, b, c, and d but I don't know x, y. It looks as though I might be able to do something with modular arithmetic given that both x(ax+b) and y(cy+d) now seem to both be integer multiples in other words either x or ax+b must necessarily contain some factors in common...
  11. Puma

    Insights Think you know Richard Feynman? - comments

    6 - it's been a long time since I read his excellent autobiography.
  12. Puma

    Integer solutions to ax^2 + bx - cy^2 - dy = 0

    Homework Statement I am a hobbyist looking for solutions to ax^2 + bx - cy^2 - dy = 0 where all variables are integers and are non-zero. Is there a method of doing this effectively? Homework Equations The Attempt at a Solution I can look at the numbers produced by ax^2 + bx vs cy^2 + dy and...
  13. Puma

    Best colour to make paint UV resistant

    Yes I am painting the frames of wooden windows with exterior paint. The binders in the modern formulations are not lasting that long, and it's very time consuming to paint them every 3 years or so, hence the reason for my looking to improve the longevity of the paint. I know Borek, you didn't...
  14. Puma

    Best colour to make paint UV resistant

    Hi I am looking to repaint my windows. I've noticed that black paint lasts very well generally. I don't really want my windows black. Is there anyway I can reduce uv damage to the binder in the paint by adding some UV blocking colour? I've googled UV blocking pigments but it doesn't seem to come...
  15. Puma

    Startup offering shares for my technology -how to evaluate?

    A good point above. Even appoint a neutral intermediary?
  16. Puma

    NASA Interest thread: Nasa warps space time

    Not kidding http://mysteriousuniverse.org/2015/04/nasa-may-have-accidentally-developed-a-warp-drive/ Astounding, is it true?
  17. Puma

    Any signs of fundamental blocks of energy?

    Or an electron cannot be made out of smaller blocks of a mass because you would have thought it would have been observed by now. I have googled and couldn't find anything.
  18. Puma

    Electronics Engineering or should I study Mathematics instead?

    I am not sure if you will have to take all of the courses again at all. Usually you have a choice of courses to take though there are some compulsory modules. I would have thought the enforced overlap would actually be very small indeed, but check out the syllabuses and see for yourself...
  19. Puma

    Thermodynamics heating water from a copper tube

    The bumping noise is due to a blocked heat exchanger most commonly or insufficient water flow. There should be an automatic shut off but they don't work so well once the system gets blocked. They should also have an expansion bladder which usually takes care of the bumping noises in the heating...
  20. Puma

    Thermodynamics heating water from a copper tube

    Well all heating systems in the UK have a pump in them so I doubt having a pump would be illegal in anyway. He's aware of the relief valve and I mentioned the need for a large tank.
  21. Puma

    Startup offering shares for my technology -how to evaluate?

    It sounds like you have massive leverage. The worth of what you have is solely based on future sales, so I would still go for a percentage and offer a few trouble shooting days software wise, and whatever else you want basically. You'll have to haggle face to face, there is no other proper way...
  22. Puma

    Find average velocity of a sphere which expands and moves

    Ok ignore v' eg imagine the sphere is stationary what is the average velocity of the sphere shell. The speed is v but the velocity which is a vector cancels out: if you imagine any point on the sphere - there is one going in exactly the opposite direction so when you add them all up the answer is 0.
  23. Puma

    Startup offering shares for my technology -how to evaluate?

    Generally for a prototyped item the renumeration is 6% of wholesale cost. If you already have regular buyers and have done extra work finding manufacturers you'll have to just add those figures on top to find the total worth of your product.
  24. Puma

    Find average velocity of a sphere which expands and moves

    That's right. If you draw a line in any direction through the shell's centre those expansion velocities cancel out so you are just left with v
  25. Puma

    Any signs of fundamental blocks of energy?

    Assuming, possibly erroneously, that there are blocks, it then seems impossible to find then any discreet fundamental block value due to the fact the blocks themselves can have a continuum of energies rather than discreet levels or ideally a single level... which I should have realised. So...
  26. Puma

    Any signs of fundamental blocks of energy?

    I would just like to ask a basic question as to whether there is any sign of there being a minimum energy block size which may hint at a fundamental particle building unit, or whether there is just a continuum of energies as far as we know so far.
  27. Puma

    Grease supply to 4 seals with different pressure gradients

    So you are pushing grease into the pistons at the lowest part of the piston cycle? Can you place the pistons vertically and just spray them all continuously at the lowest piston point collect the waste oil and recycle it? (allowing the piston head to reach a freshly oiled part of the cylinder...
  28. Puma

    Thermodynamics heating water from a copper tube

    Never mind the calculations. You need a pump which is regulated by a thermostat kind to stop the water boiling and to get the water out at an even temperature, a relief valve, a large immersion tank to feed your heating or hot water, and another thermostatically controlled device to pump the...
  29. Puma

    Household Portable Electric Blender Blade Design

    Generally Industrial designers take a design that works and largely copy it - they may change it a little on the basis of style and instinct. If it works why do more research? Having said that there is a good article here in what to look for in a good blender...
  30. Puma

    And if i fail?

    What a nightmare to be honest. I have to say I made the mistake of working too hard. I was absolutely exhausted in the exam room and this cost me a lot of marks. Make room for exercise. Never do useless revision. This is the other mistake I made. Revising when I was tired and bored. Half an...
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