Scale Definition and 721 Threads

I wasn't sure where to put this post, but I'm interested in the Kardashev Scale and what the different Types of Civilization are in relation to us. I'm only somewhat familiar with Types 1-3 but am interested if it can go higher than that and how it can be described.

Remember that a scale records the value of the normal force, not a person’s actual weight. Draw a FBD. Rotate your coordinate system. A 61 kg student weighs himself by standing on a scale mounted on a skateboard that is rolling down an incline, as shown. Assume there is no friction so...

Homework Statement Supposedly, I put an object on a scale inside the elevator of a building, the scale reads m1. I start the elevator to the top of the building, during acceleration, the scale reads m2. As the elevator normalized, the scale reads m1. During the deceleration at the top, the...

The Hubble parameter is defined by: H(t) = a'(t) / a(t) where a is the scale factor which is a function of cosmological time t. This definition is equivalent to the Hubble relation: v(t) = H(t) r(t) where v(t) and r(t) are the proper velocity and distance of an object at...

No-one is suggesting that this is exactly the same as the wave-particle duality that exists at the quantum scale (e.g. non-locality) but I thought these papers looking at the behaviour of “walking droplets” that can be seen at the macroscale were very interesting: Quantum mechanics writ...

I'm not asking for what reflection and refraction are or the usual law governing it, but I would like to understand what they represent at the quantum atomic, molecular level? In a mirror is it about photons absorbed and emitted with the same wavelength and same direction through atomic electron...

I will be entering university in an aerospace engineering program next year but I want to get a head start on it right now. What I mean by that is start building basic rockets and planes, or even more basic than that, I don't know. Why I am here is to ask for guidance on where to start. I...

Hello everyone, thanks for reading. We all know that Quantum mechanics can be "ignored" when working with systems in which the typical distances and energies are big enough (compared to h, or other quantum constants). However, when I try to think of an explanation for it I'm not sure I hit...

Hello all: I would very much appreciate advice on setting up a problem. Apologies in advance... This is probably a silly question--I'm more of a chemist than an engineer/math person! I have written a code for calculating changes in concentration/mass within a domain over time, as new...

Homework Statement A weighs 600 N on an elevator when it is stationary. Each elevator accelerates according to the specified arrow that is drawn next to it. In all cases where the elevator is moving, it is moving downward. Find net force, if the elevator is accelerating 2.0 m/s/s upward, even...

Homework Statement A person stands on an scale in an elevator. If the scale reads zero, should the student worry? Explain. Homework Equations The Attempt at a Solution I think the student would be in free fall and he should worry. The only force acting on the elevator would...

First time poster so please be gentle... E = h * f f = c / wavelength 1) Is there a theoretical limit on maximum f (minimum wavelength of Planck length)? 2) Is there a theoretical limit on minimum f of 1 (maximum wavelength of c)? (ie// the maximum distance that a photon can cover in...

Because I cannot draw a picture in this problem, I will do my best to describe it in words. This problem is about a circular railway track. The diagram that goes with it shows one of the 15 curved pieces. Its width is MEASURED 1 cm and its arc length of the inner edge is MEASURED 30 cm...

To start, I'm not at all knowledgeable in physics; completely ignorant. Now, I know I could go ahead and research this on my own, but I've always felt like asking an actual interactive human being is the best way to gain direction compared to a lifeless search engine or book. So how do we know...

Hi, I was watching Through the Wormhole two weeks ago (I think it was a re-run), and they were talking about the uncertainty principle, and how it was impossible to prove due to the change in momentum of a particle when hit with an observation device, such as light. I think the guy was using...

What is the mechanism of pH scale?

i know how to read these scales, but this problem was really hard to see for me. can you guys see if it lines up at .44mm or .46 mm? I attached drawing

Max Tegmark has provided a four part taxonomy of multiverse theories (http://arxiv.org/abs/astro-ph/0302131). The first type can be labeled the "bubble universe" multiverse, in which universes like ours are scattered throughout an infinite space in every direction. Going the other direction...

Hey, I know that the kelvin scale uses the absolute zero as its null point. If so, I wonder why the scale needs to be defined using the triple point of water. I mean, the absolute zero serves the purpose of defining the kelvin scale already, doesn't it?

Hi.. umm, I'm from the math department, and um...I'm shy... hello physics people... So I saw this thing on tv, I think it was Through the Wormhole..I'm not sure..and um, don't judge me for watching "science for the uneducated masses"... But anyway, they were talking about gravity, and...

Okay, I will preface this by saying that I have no formal education in physics. I am just a regular man with an active mind and healthy dose of curiosity. There may be some errors in my terminology, but hopefully you'll get what I am saying. Heck, maybe this is already a well known hypothesis...

Empirical evidence supports that the scale factor is proportional to the following. a(t) = e^(HT) Where the distance between any two objects are D(t) = a(t)Δx Where x does not measure physical distance, but a conventional coordinate distance. This means that eventually any physical distance...

Homework Statement Expansion of the universe is described by the scale factor R(t), where t is the time after the Big Bang. For a flat universe the scale factor is today R(t)=C_{1}\cdot t^{\frac{2}{3}} When the Universe was radiation dominated, for t <200,000 years, the scale factor was...

I am doing multi scale analysis while solving a particular nonlinear PDE. I am trying to check a solution I have for a particular set of boundary conditions and governing equation, to a given order. Is there a simple way to sort scales on Mathematica? For example, if our small parameter is...

I'm working on a gravity simulator and I can't help but feel that I've done something wrong. Extremely large bodies take a longer time to fall into each other than smaller ones. Is this right? Like for example, if you had to bodies of solar mass at 1 AU apart, would it take a longer, shorter or...

Homework Statement Okay , i am trying to know if a compass will work alongside a pedometer , under a very weak battery. What i mean by this is that will there be a large scale interference if the compass is placed next to it. I am trying to do such since, according to my schoolwork have to...

if we have cylinder full of water on a scale the we heat it, does the scale show any difference in weight of cylinder? water don't evaporate.

A student showed me a problem, this week, it was: What is the number of regular polygons whose intern angle is an integer number? I used the equation i=180 (n-2)/n, where i is the internal angle of the polygon and n is the number of the sides of the polygon. After some trials, i got to the...

Dear All, I started to use Mathematica to make some plots I usually did with gnuplot. I know it has some great color schemes, but I would like to be able to use the same I was using in gnuplot. The question is: how could I create a color scheme? In gnuplot I just used the following command set...

As the title says, I am confused - very confused. I know that the 2nd law of thermo means that the universe is increasingly disordered on a universal scale, even though there has been an apparent increase in order since the "Big Bang." Does that mean entropy isn't exactly synonymous with a...

Hello. I have been working through some questions and answers to do with cosmology. One of them asks you to consider a model where: \Omega_{MO}=3 \Omega_{\Lambda O}=0.01 \Omega_{RO}=0 and asks you to show mathematically that the model re-collapses. Following through the math, I get three...

I was trying to figure out the following - assume you have an old fashioned balance scale, with two pans hanging from a lever with a fulcrum in the middle of the lever. On one side you have a weight of X, and on the other side you have a weight Y. If Y is big enough, that side of the scale...

hi this is word21. I have a question to anyone who can help in any way.is there a mathmatic form. that is best to use to asign integrals to musical scales as in a=x number

Why are quantum fluctuations amplified when viewed on a smaller scale? I read about this in 'elegant universe' but the book never answered my question.

I recently heard of this theory: Discrete Scale Relativity which can be found here: http://www.science20.com/discrete_scale_relativity/blog/discrete_scale_relativity-78208 and http://www3.amherst.edu/~rloldershaw/ What are the issues with this theory and why has it not picked up more...

1 being the worst you can buy right now, 100 the best you can buy right now i got a mobile intel R 4 series express chipset family with a booster: nvidia geforce G210M cuda 512Mb i think that's right. >.> could be wrong though :s the dxdiag window thing just says the mobile intel r 4 stuff but...

Not long ago I was arguing with someone on the Internet (where everyone is wrong) about impact of quantum effects on macro scale objects. Imagine ice-hockey table (one with almost no friction) with number of pucks on it. If you'll hit one of them it is safe to say that pucks' paths are very...

hi all.. i facing problem to get a good contour..because the scale at fringe levels so big. for example: level 8 = 1.224e+037 level 9 = 6.122e+036 level 10 = 0 i have 4500 element that the value from 0 to 6.122e+37..so the result that i got all in blue color because have a big difference...

After reading more about Loop Quantum Gravity. I realized they tried to solve quantum gravity by literally sweeping Planck scale under the rug. That is. The smallest volume and area of the spin networks in LQG is Planck size. In String Theory, they make the string Planck size too. They are just...

Is the need for Quantum Gravity only related to understand what goes on in the Planck Scale between quantum fields and curvature of spacetime where they collide. Or is it a more general solution to how quantum object is connected to spacetime (or quantum spacetime)? Let's take the example of a...

Homework Statement The arms of a scale are of equal length so that when weighing objects, one side will hang lower if the load is heavier on that side. Homework Equations List the weights P1 through P4 in order starting from the heaviest and ending in the lightest based upon the...

Hello all - I'm new to the forum - I hope some kind person can help with a question of calculating scale weight in a scale model of a glider. I want to test the glide ratio of a glider design by making a 1:4 scale model and thowing it from a certain height at a certain speed and measuring...

Reading on a weighing scale... Homework Statement Two vessels have the same base area but different shapes.The first vessel takes twice the volume of water that the second vessel requires to fill up to a particular common height. IS the force excerted by water on the base of the vessel same...

Hello All, Does anyone have a picture/chart in their possession depicting the scale of atomic and subatomic particles? I'm basically looking for a diagram that shows the relationship of atomic matter according to size (IE: Atom Nucleus>Proton>Quarks). Also a description of each particle in the...

Lisa Randall's states in the book "Warped Passages" dealing with the Hierarchy Problem: "The Plank scale energy determines the strength of gravitational interactions...the strength is inversely proportional to the second power of that energy...A huge Plank scale mass is equivalent to...

I need to design a scale. It is a simple 2-D problem. All you need to know is that it's a plate on a vertical spring. Each end of the plate slides a little ways into an indent. It is a scale for weighing ingredients in a bakery. A weight of 22lbs (+or- .25 lbs) is acceptable. If there isn't...

Hello all, I'm a 3D graphist trying to deal with particles motions and attributes for visual FX I have a surface mapped with a black and white picture. Those different grey values gives me a x value inbetween 0(min) and 255(max). Particles are shot from this plane and from random positions and...

http://arxiv.org/abs/1102.2784 New Limits on Planck Scale Lorentz Violation from Gamma-ray Burst Polarization Floyd W. Stecker 3 pages, submitted to Phys. Rev. Letters (Submitted on 14 Feb 2011) "Constraints on possible Lorentz invariance violation to first order in E/M_{Planck} for photons...

The guiding premise of this thread is the following proposition: If fractals play a role in the behavior of partitions, then maybe, just maybe, they play a role also in the positioning of the primes; and if they do, then who is to say that the two, prime numbers and partition numbers, cannot at...

Homework Statement The scale on a map is 1:25000. The length of a wall on the map is 3.2 mm. Find the actual length in metres.Homework Equations The Attempt at a Solution