Scale Definition and 721 Threads

My skill with proofs and number theory is very limited and my use tends toward the stereotyped physicist. Dealing with infinities and identifying exactly what assumptions are in play has become somewhat an issue for me though. My questions are contained in the following visual tool. Please slap...

EDIT: I corrected a typo below: I had forgotten to put my entire expression for a(t) to the power 1/3. It's corrected now This may sound like a silly question but it's bugging me quite a bit. Consider a cosmological model, let's say the simple case of no pressure, no cosmological...

Extension of Einstein's principle of relativity: http://en.wikipedia.org/wiki/Scale_relativity How well known is this idea, and what's its status?

Homework Statement I must determine the mass of 2 objects with lab equipment and 50g mass pieces a scale may not be used as well as density. Homework Equations have no idea The Attempt at a Solution have no idea

When I step on a scale I see that it says...70kg. We typically call this value weight? However, kg is used for "mass" and not "weight". So when we say 70kg do we mean that my mass is 70kg OR do we mean that my weight is 70 N? So if it does mean mass, then my ACTUAL weight is 686N! lol And...

I am taking a Math/Cmpt class and I am useless with this program that we need to use Matlab. Q: The derivative of a function f(x) can be approximated at the point x=x(sub)0 by a forward divided difference f'(x(sub)0) ≈ [f(x(sub)0 + h) - f(x(sub)0)] / h or by a central divided...

a b ___ | | | | | | | | | | | | | | _____________________ | | | | |___| |_____________________| ============= =============...

Homework Statement See image Homework Equations M = log(I_i / I_o) The Attempt at a Solution See image

To date, the little higgs implied by some SUSY models requires higgs of energies less than 130 GEV, which Fermilab's Tevatron has not yet seen. These models do help explain EW breaking, however, If SUSY explains E-w scale breaking, does it require a little Higgs at Tevatron energies? I...

1. A 11.4kg block of metal is suspended from a scale and immersed in water. The timensions of the block are 12.7cm x 9.9cm x 9.2cm. The 12.7cm dimension is vertical, and the top of the block is 4.94cm below the surface of the water. The acceleration due to gravity is 9.8m/s^2. What is...

Spectrometer vernier scale. Quick answer please! This is a quick question. I am measuring the emission spectra for hydrogen, but now I'm finding myself wondering about measurements in the vernier scale. I have the right and left angle measurements; however they differ by more than 180 degrees...

Homework Statement suppose that a spring is used in a spring scale that is limited to a maximum value of 25N, but you would like to weigh an object of mass M that weighs more than 25N. What commonly available equipment, along with the spring scale, can be used to determine the weight of the...

Homework Statement * A 14.0kg block of metal measuring 12cm x 10cm x 10cm is suspended from a scale and immersed in water. The 12.0 cm dimension is vertical and the top of the block is 5.05 cm below the surface of the water. (a) What are the forces acting on the top and on the bottom of...

Does anyone know the significance of 1233 degrees Kelvin?

I would want to create medals is it possible to do this on a small scale

An elevator is at rest with a bag hanging from a spring scale. My question is Which force gives the scale reading? The mg (the weight of the bag) downward or the force exerted by the scale on the bag Fn gives the scale reading? thanks.

double log scale - please help I am trying to find/create the equation for a straight line on a double logarithmic scale graph - what is the format of the equation or how do I do this using data points from the graph.

Help please! Here is the prob and i don't not know where or how to begin. 1.Jose was having a really bad day out on the bike. He should have checked the forecast. First, the wind coming out of nowhere. Must have been a steady 30 mph with gusts up to 50, head on. Then the lightning. First 1...

Hey guys If the output of the function generator for a sinusoidal waveform is 6 voltage divisons peak to peak along the voltage axis- and the voltmeter reads 2.12v, find the volts/div scale that is being used? for this do just divide the volt given by the division given?, please help,(pretty...

#1 On takeoff, the combined action of the engines and wings of an airplane exerts an 8000N force on the plane, directed upward at an angle of 65* above the horizontal. The plane rises with constant velocity in the vertical direction while continuing to accelerate in the horizontal direction...

Hi all, as a school project we are trying to build a small scale windtunnel. I've been doing a lot of reading, the design of the tunnel is basicly done now. But now comes the real math's. So I got a few questions which i hope that can be answered by one of you guys. To deside the scale of...

A 62-kg girl weighs herself by standing on a scale in an elevator. What does the scale read when the elevator is ascending at 11 m/s but its speed is decreasing by 5 m/s in each second? I'm not really sure where to begin.

This idea is for an alternative to large scale energy storage. Sorry for the double and confusing post (https://www.physicsforums.com/showthread.php?t=179768), I should have posted here in the first place. As far as I can understand, pumped-storage hydroelectricity is the main technology used...

Hi everyone, I had to write about the cardiovascular system in biology and that got me thinking, would quantum effects alter the flow of oxygen or other chemicals around the body? Atoms really aren't that small, electron microscopes can after all see them, but at what scale do quantum effects...

A couple years ago it was typical to see in articles, and to hear in conferences, specially when discussing about the hierarchy or about meeting of the coupling constants at GUT scale, of some other examples of misleading coincidences. The most prolific example was the coincidence between the...

What would an 80/100 translate to on the 0-4.0 scale at most universities?

The empirical MOND explanation of galactic rotation curves involves switching over in the low acceleration regime from the Newtonian acceleration Gm/r^2 to the MOND acceleration term sqrt(Gm a_0)/r. This is normally achieved using an "interpolation function" which effectively switches off one...

I bought a 80g x 0.01g scale from ebay and it came with a 50g weight. Now this weight is exactly 50g up to more than 1mg, I suppose? But when I put in on, it read 50.08g. So the scale is off it seems. There are instructions to recalibrate the scale but it seems like the instructions are talking...

Hi to all, I have a quantum question to post here. In the discussion on atomic theory, we know that electrons in different orbital levels have different quantum energy, say n=1 and n=2 have different energy levels. When one electron 'jumps' to another energy level, say from n=2 to n=1, the...

Hey, How do u arrive at the state diagram for a scale of 10 gray code counter? I know how to draw all the used states, but the problem comes when the unused states are considered. The unused states namely are:1100 0100...

I will be writing my final exam tomorrow evening, and I am currently terribly stuck on the following practice problems. I have posted my thoughts below each problem. They look tricky to me. It would be very nice if someone could help me out and I will remain eternally grateful for your help...

Homework Statement I just used the Kundt's tube to illustrate the effect of a standing sound wave in a glas tube. The characteristic nodes and antinodes were perfectly visible and some small scale striated vibration patterns at the antinodes were prominent. What is the physical explanation for...

We are given a form of Einstein's field equations: 3R'' = -pR R''R + 2((R')^2) = p(R^2) where p is a constant and R' = dR/dt Assuimg that R and R' are both positive, we are asked to show that the general solution is R(t) = A*[(t-ti)^(2/3)] I'm very confused about this. If we...

What is the ratio of the scale factor now to the scale factor at the end of the inflationary era? Edit: In other words, what is the z value of the end of the inflationary era?

If you look at the planets, they group into a star, which all form a galaxy. It just seems like everything groups together. Our observable universe with the Hubble isn't as enormous as the universe may be. If so, galaxys would form an even greater cluster and so on and so forth.

What happens with causality at the Planck scale? Can effects "precede" causes? I would like to know what happens with causality at the Planck scale, explained in "educated layman" terms, if that's possible... :) Might effects "precede" causes in time? Do we have to redefine causality at the...

Hello, here's my problem : I was introduced the Gauss algorithm used to scale a matrix (to obtain a triangular matrix in order to solve a system of equations), but my teacher says that we can only use the pivot line to null the rest of the numbers of the column. The fact is I have done quite...

A pulley Problem Homework Statement So, in the diagram attached one mass is 1 kg, and the other one is 2 kg. and what would be reading on the scale Homework Equations F=ma The Attempt at a Solution I think this is very much like an elevator problem where the elevator is moving...

A Wikipedia article says: "The surface of the inner core exhibits rapid variations in properties at scales at least as small as 1 km. This is puzzling, since lateral temperature variations along the inner core boundary are known to be extremely small (this conclusion is confidently constrained...

arvind drops a scale vertically which is grabbed by Vijay whose hand is just below the scale. In the mean time the scale slips by 20cm. What is the reflex time of Vijay?

Hi,I had this problem which I cannot answer. I would appreciate if someone could help me out. Here's the problem - Homework Statement In the labaratory,you are asked to determine the mass of a meterstick without using a scale of any kind. In addition to the meterstick you may use ...

The Kardashev Scale is a scale (duh) that judges civilizations based on their energy output. There are Three Types: Type I: 1.74×1017 W Type II: 3.86×1026 W Type III: 10^36 W Now, its is said that civilizations will grow like this: Type I: Uses the energy output of One Planet...

I'm stuck, again, on a particular passage of a book (jean zinn justinf's QFT and critical phenomena). it says: We will find it convinient to t -> t/hbar , the action is then written as: S_{0} / \hbar=\int_{t'}^{t''} dt [\frac{m \dot {x}^2(t) }{2 \hbar^2} + V(t)] where t' and t'' are...

I'm supposed to determine if a bunch of materials have a high or low impact strength. I did the hard part and determined that the impact strength for each material, but I don't know a relative scale. What is a high value on the izod impact scale test(it's measured in joules). Any idea?

Hey! I'm new here.. and I desperately need help for some PHYS12 hw.. I hope I'm in the right place. My new teacher has a strong russian accent so I don't understand a single word he ever saids. A uniform 1.3 kg beam hinged at one end supports a 0.5 kg block. the bean is held level by a...

A 1.5kg crate falls from a height of 2.0m onto an industrial spring scale with a spring constant of 1.5 X 10^5 N/m. At its greatest compression the reading on the scale is: My work: mgh= PE (1.5kg*9.81m/s*2.0m)= 30J The potential energy of the crate is 30J The Force of the crate is...

hi all! I am not a physics but enginereing major. I am confusing about what's going on with heat tranport in micro- scales. I encounter terms like phonon-electron interaction, electron gas, lattice etc.. What exactly is a phonon? does it posses mass? What is electron gas? Could anyone...

I have a problem that shows a picture with an arrow in it. The arrow in the picture shows that is is 5 cm in length. The actual length of the arrow is given in the problem as 43 m. The question asks for me to determine the scale of the picture. So, I've set up a ratio: 1/x = 5/45 (1 cm...

Hi firstly Thanks for the help... I am not very good at forces ... and spring balances etc... Q1 A 10N force is pulling up on the ring of spring scale that weighs 2N. If an 8N mass is attached to the bottom hook of the scale, what is the scale reading? I figure that the mass of the...

In the macro, non-relativistic world, let's say that the present is the interval that separates the future from the past. And that this is an analogy for the interval within which the probability waves in a region in space collapse into particulate matter resulting in a measurable event which...