Search results

1. B Mobility in a Strong Gravity Environment vs. Moving Mass?

This is a basic conundrum that has bothered me for years: if you or a species like you is "adapted" to Twice Gravity (or any other multiple of 9.8m/2 squared) and your life functions and capacities are near identical, How strong/fast are you? Compared to 1G? See, this is the issue of mass vs...
2. Can Phonons and/or Thz+ Acoustic FX cause Ionizing Radiation?

For example: https://www.laserfocusworld.com/test-measurement/research/article/16566273/scientists-develop-saseran-acoustic-laserthat-produces-terahertz-sound-waves Can these devices produce ionizing radiation? I understand ultrasound traditionally does not produce ionizing radiation, but I am...
3. B What is the energy required to approach near absolute zero?

I'm trying to understand if the amount of effort/energy required to get to absolute zero approaches infinity, or if its a linear thing... is there a point in which dropping near 0 kelvin changes from a 1:1 to an exponential curve? Is the whole thing a curve or is there a static point, like 1...
4. B Is there a Relativistic Quantum Chemistry Table?

Wiki said "Arnold Sommerfeld calculated that, for a 1s orbital electron of a hydrogen atom with an orbiting radius of 0.0529 nm, α ≈ 1/137. That is to say, the fine-structure constant shows the electron traveling at nearly 1/137 the speed of light. One can extend this to a larger element with...
5. B 100sqft wormhole from sea level to outer space?

Hypothetical scenario and I'm trying to understand the velocity of the air as it tries to equalize with a large vacuum. I presume this model isn't very much different from an initial loss of 1 atmosphere pressure in space via some puncture. I'm mainly concerned with the immediate wind speeds and...
6. Friction of a Wheel on the Axle?

So say ive got a wheel who's outer radius is 12" and the radius of the axle is 1.5", so the simple machine here is an 8 to 1 ratio. So im wondering, since 1/2mv^2 is for kinetic energy, and the velocity here is 1/8th, does it mean the friction is 1/8th or 1/64th? does it get 1/8th hotter or...
7. B When do we use which notation for Delta and Differentiation?

I was taking notes recently for delta y/ delta x and noticed there's more than one way to skin a cat... or is there? I saw the leibniz dy/dx, the triangle of change i was taught to use for "difference" Δy/Δx, and the mirror six ∂f/∂x which is some sort of partial differential or something...
8. B Equations vs. Functions Quadratic and Cubic?

So if i take the rules that a straight vertical line drawn through the function with more than one intersection implies it is not a function, to mean that the quadratic equation for a circle is not a function. Furthermore, it also implies a cubic equation, such as x^3 can be a function, because...
9. Lens Math for a Semicircle and Vesica Piscis?

Hi, I'm trying to find the way that light (sunlight?) distorts through a lens with a diameter of 1, if the lens has the shape of a semicircle (width of 1/2), and if the lens has the shape of a Vesica Piscis (width of 1/√3). if you need units, yards works. I'm also curious about how that light...
10. A How is Inaccessible Cardinal Written?

I'm writing some notes on set theory, Aleph Null, etc., and was wondering if there's a Notation or Symbol that abbreviates this (inaccessible/strong/uncountable etc. cardinals). I'm not sure if ive seen notation before but it seems like symbols resembling Theta and phi have been used.
11. B What is the name of this triangular geometric shape?

I used to think it was called Zeno's tower, but then realized I probably called it that because it reminded me of his paradox. I have been unable to find this shape on the internet, although I saw a small steel tower outside Stonybrook using this geometry. I have attached an image of the basic...
12. I Equidistance of Points in a Sphere?

I've been trying to wrap my head around equidistant points, like platonic solid vertices inside a sphere where the points touch the sphere surface. This led me to the strange and unusual world of mathematical degeneracy, henagons, dihedrons, and so on, along with the lingering question of...
13. Automotive Flying Hypercars?

Recently the Bugatti Chiron set a record of some sort for rapidly accelerating to 249 mph and then dropping back down. The engine is something to the effect of 1500 horsepower and the vehicle isn't terribly heavy. Old Airplanes had engines below 400 horsepower and ultra lights can be far less...
14. What happens with counter rotating gyroscopes?

I was thinking about retro rockets for landing and how precise they have to be, but then i thought "you could stabilize the whole thing with a gyroscope". Then I realized the gyroscope would cause the landing shipment to rotate in the opposite direction. So I thought, hey, why not two...
15. For gear teeth to linear shaft, what's the center point?

I used to know this back when i worked with Flash animation, but I'm working on a 3D printer now and I've forgotten, when you have a set of teeth, on a linear shaft and a gear, do you base the unrolling of the gear, for the spacing, on the inside of the teeth, the outside of the teeth, or the...
16. Coil Winding Orientation and Pattern...

OK, so imagine you have a wire coiling over itself, in a near concentric spiral. When you get to the outer most edge, such as 10 or 100 wrappings depending on thickness, you then bend the wire so it's one diameter of the wire over and then start spiraling inward, till you get to the smallest...
17. How do I calculate Phase Angles?

So I got to the part of my math/engineering textbook on vectors and scalars, and I've got to calculate phase angles and voltage. I see this equation, and I've tried doing it different ways but I don't get correct answers. tanθ=XL−XC / XR Angle θ represents the phase angle between the current...
18. Confusing terms? Live, Common, Neutral, Ground...

OK, so I've gone through probably 90 tutorials on electricity and related topics, and there's a bundle of terms I ran into, used by people ages 12-80 with a dozen different accents and twice as many time zones. (So I'm not sure how many terms are universal and how many are provincial). Live...
19. Surface area of a Hypersphere?

I'm wondering how to scale up the surface area of a sphere of 6 million meters in radius, into a hypersphere of similar radius (i.e. a Hyper Earth). I would also like to know the ratio. I would like to know the basic value in 4th dimension, but knowing values for 5th, 6th, and higher would...
20. Sine wave & reflection question?

I seem to recall it is possible to change a wave's frequency, pattern, and amplitude by adding another wave to it. Is it possible to add a second wave to a Sine wave to turn it into a cosine wave of the same amplitude and how would you do this? I'm thinking if I had an amplitude 1 for the...
21. Plasma reaction with Water?

what happens to a body of water when coming in contact with plasma - such as the plasma cutters? I've been thinking if you had a cylinder filled with some water and something like a plasma "spark plug" you could get some serious vapor pressure. Is this an accurate estimation, or am I way...
22. Graviton amusement ride as generator?

Hi, I was thinking about the graviton ride at amusement parks - the one that sort of simulates the feeling of gravity by spinning. I was wondering if the pressure between two objects (such as your head and the surface when spinning around) is potentially useful in terms of power generation, via...
23. ? Inverse Series method?

hi, im trying to find out how to get the inverse of the series 1/1+1/2+1/3+1/4.... i know the output of 30 is approximately 3.99 and 450 is around 6.6, but I'd like to be able to find the fraction range for outputs of numbers such as 10, 20, and 72. The online series calculators tend to die...
24. How fast does a human sink in h20?

assuming a human being with average body type and health, how fast does a human being fall through water from the surface? what is the terminal velocity and what is it reached at? I've been trying to find answers everywhere but can't get a straight answer. These calculations would be useful...
25. Square pyramid?

I was reading book on numbers and it had an equation for 1^2+2^2+3^2+4^2+5^2... but I worked out the equation several times with different integers and they didn't appear to work at all. Does anyone know the equation for finding the total sum if the base sum (such as 5 above) is known?
26. Toroidial Time

I was staring at my calculus book when this came to me, so apologies if its a little murky. I've been thinking about hubble time and noticing something odd, that my astronomy professor really couldn't (or wouldn't) answer. t(u)= 1/H x 10e12 years which didn't quite work because if the...
27. Help with integral?

Hi. I've been having a lot of difficulty wrapping my head around (1,0) is the same as the set {1,{0}} 1. I do not know what a Set is, and the definitions I've found do not make any sense. 2. I still do not understand integrals 3. I do not know what this {1,{0}} means. 4. all my...