Scale Definition and 721 Threads

beaker with water on a weighing scale... A weighing scale has a beaker of water on one side and a balancing weight on the other side. You put your finger into the water carefully without touching the beaker. Will the balance be upset? Which side will appear heavier, if so? What will...

Hello, I had a question about the Cassimir effect. As I understand it the force is created by an Electromagnetic radiation vacuum created in between two closely spaced metal plates and since only non-half integer wavelengths can exist in this spacing, the plates are drawn slightly closer...

In a screw gauge, the pitch is defined as the distance traveled in one rotation. Is it also equal to the length of one main scale division? If the length of one main scale division is not given, then can we take it to be equal to the pitch? Or do we take it as equal to some other default value.

How do I change the scale of the x-axis so that it does not automatically plot the number of data I graph but my customised x points? My situation: I like to graph hundreds of different points or data But only want the x-axis to be from 0 to 3, including decimals in between.

Im doing a project and i did some test with AL using the Rockwell/Vickers machine and I was wondering if the units i have are in Kg and if they are I need to pick a unit to change them to so i can have a scale what should I use. my teacher was saying something about using the K value for the...

I basically am having a problem understanding the units used on the atomic level such as MeV/c and MeV/c^2. I have a problem where I have a given energy of 370 MeV for a photon. This means the wavelength is \lambda = \frac{{(6.6261*10^{ - 34} )c}}{{(3.7*10^8 eV*\frac{{1.6022*10^{ - 19}...

A 1-kg beaker containing 2 kg of oil(density = 916 kg/m^3) rests on a scale. A 2kg block of iron is suspended from a spring scale and completely submerged in the oil. Find the equilibruim readings of both scales. For the bottom scale, I can find the weight, 29.4 N of the beaker and oil, but...

I read somewhere something about observability, and things which are infinitely big, or infinitesimally small. Basically, the question is whether it would be possible to make an observation of an infinitely long yardstick. If it existed, could you observe it in it's entirety ? is it possible ...

I am working on a homework for a programming class. We have to create a Logarithmic plot and add to it a marker when the program is running on the click of the mouse. That is NOT the problem :) , in fact, that's very simple! My problem, however, is with the scale. When my plot is in linear...

Hi everyone i have comed across a fairly difficult question in chemisty that's been baffling me. A 51.1 mL of 0.153M NaOH was mixed with 27.5mL of 0.0147M H2SO4. What is the pH of the resulting solution. What I want to ask is shouldn't the resulting solution, water, be neutral with pH of 7...

http://www.lightningpacks.com/" to recharge your dig cam batteries on a wilderness hike. "Carrying weights of between 44 and 84 lbs, testers generated up to 7.4W,..."

I am asked to prepare some information on ph scale. I know what pH is, I know how to calculate it in some cases, I know it is lower than 7 for acid and higher then 7 for base - is there anything more important? G

you are standing on a scale in an elevator. the scale reads 176lb when the elevator is at rest. the elevator begins to accelerate upward at 12ft/s^2. what is the reading of the scale? i converted 176lb to 80kg. i know the sum of all forces equals mass*acceleration but i don't know what...

formula Help! i got this question but i don;t know which formula to use Q - A 1m plank of Mass 1.0kg is placed on two scales which are at either end of the plank. Masses are hung underneath the plank. Mass A = 5.0kg at a distance of 0.30m from the left of the plank Mass B = 5.0kg at a...

Hi, this problem gave me some trouble and I'm not sure if I did this correctly. The problem reads: A 75-kg person steps onto an elevator with a scale. What does the scale read when the elevator (a) is at rest, (b) climbing at 3.0m/s, (c) falling at 3.0m/s, (d) accelerating upward at 3.0m/s^2...

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.67 of the person's regular weight. Calculate the acceleration of the elevator. how do i start this problem? help please!

http://www.arxiv.org/PS_cache/astro-ph/pdf/0508/0508047.pdf

Need a help on how to go about building a Laboratory scale using strain gages I need to build a scale with a working range of 2 to 200 gm, an accuracy of at least 2 gm, footprint of no more that 16 in sq, and use no more that 6 strain gages. I believe I need to set up the strain gages in...

During a physics prac today, we were using a traveling microscope with a vernier scale. My demonstrator told me I was reading the scale wrong, and as much as I tried to convince him otherwise he insisted he was right. Can anyone here tell me what the correct value to be read from the vernier...

If two 100-N weights were attached to a horizontal spring scale would the scale read 0, 100, or 200 N, or would it give some other reading?

Hi All, I would like to hear opinions about an explanation I gave some time ago to provide physical fundamentation to the concept of instantaneous velocity. I started showing a typical situation where one calculates average velocity between events separated in time by one second. Along the...

I need to find the mass of an aluminum rod without the use of a scale. I have all the dimensions of the rod but I just don't know the right equations etc. Thanks for the help!

Hi All, I was wondering if someone could help me with a basic understanding of the scale of things in our body. I love this little animation that Brian Greene has out there http://www.pbs.org/wgbh/nova/elegant/scale.html I know very little about biology, so you’ll need to humor me if...

What is "scale radius" I've tried posting this on the Cosmolgy and astronomy forum but got no reponses yet.* Of course it only been a few days but I'm impatient... *I've been researching dark matter lately.* Evidence for it in spiral galaxies is the fact that the stars revolve about the...

Hello, I'm writing a bit of an absurd business plan, and I'm faced with ethical considerations. I'd like your advice. The plan consists of using certain species of monkeys as laborers, on a massive scale. The monkeys will be bred, trained and employed to carry out specific tasks, which can't...

ok on a scale from one to ten exactly how likely is it for M-theorie to be true?

After a spectacularly unsuccessful first post--the silence of the replies was deafening--I would like to again beg the simplest of answers. I am aware that most forums of this kind do not allow unqualified pontificating, yet I'm seeing quite a few ‘ideas' being put forward, and they often...

Wow, just found this great little link that gives an awesome perspective on the scale of things. Just thought I would share: http://www.pbs.org/wgbh/nova/elegant/scale.html

My sister's having kind of a rough time in high school this year. I was talking to her about it and I was really surprised to find out what her school's grade scale is: Numeric Average | Letter Grade | Description 90-100 | A | Excellent Progress 80-90 | B | Good Progress 75-79...

So, we have to build this scale in mechatronics class that weighs things as small as a dime to as large as however we want, but it has to weigh a dime. I came up with this idea that will be constructed with legos: A pully (20 cm radius) will be fixed on a shaft with a cup kindda thing hanging...

I'm wondering what happens if the scale factor of cosmological expansion increases without limit? Will you always calculate the same quantum foam and virtual particle production rates no matter what the scale is of the universe's expansion? If particles are extended objects, then of course...

Just a quickie I'm taking a slice of a galaxy picture and plotting luminosity vs kpc. I'm fitting a luminosity profile (de vacouleurs) and keeping disk scale length as a free parameter. However, textual values for this (referred to as h from now on) range between 3-4 kpc for most galaxies. h...

Space time question. Before I ask my question I suppose I should ask a preliminary question that will tell me if my actual question has an answer. Does space time only exist in space? If so, is Earth's surface considered space, thereby abiding by space times rules? Also, theoretically if we...

A 20.8 kg mass attached to a spring scale rests on a smooth, horizontal surface. The spring scale, attached to the front end of a boxcar, reads T = 38.7 N when the car is in motion. If the spring scale reads zero when the car is at rest, determine the acceleration of the car, when it is in...

Here's a question. I don't have any problem getting the answer, or identifying the forces, but I'm having trouble explaining why the scale reads what it does. A woman of mass 65 kg stands inside an elevator on a bathroom scale calibrated to read in Newtons. Calculate the scale reading in...

What does it mean for a matrix or a vector to be "defined up to scale"? I don't remember ever seeing this expression in my very limited exposure to linear algebra. To put it in context, I'm finding it in a text on computer vision in the section on geometric camera models. They're talking...

Most commercial nuclear fission reactors are large, on the 1000MW order of magnitude. Some of the early experimental reactors were small, and the reactors in nuclear submarines are relatively small. I understand that the Navy even has one very small (crew of 7 people, 400 tons v...

Clauset and Young, in their new paper http://www.arxiv.org/PS_cache/physics/pdf/0502/0502014.pdf , apply standard modern statistics to a database of terrorist strikes ordered by the number of people killed or injured. They find that extreme cases, such as 9/11, are not outliers, but find their...

1. A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 836 N. As the elevator moves up, the scale reading increases to 936 N, then decreases back to 836 N. Find the acceleration of the elevator. 2. The instruments attached to a weather...

if you stand on a bathroom scale, the spring inside the scale compresses .50 mm, and it tells you your weight is 700 N. Now if you jump on the scale from a height of 1.4 m, what does the scale read at this peak. i found an equation to use, i just can't figure out what I'm solving for. I'm...

The question is I have to convert my scores to GPA system. But first I have to know how you calculate the GPA number over a scale of 4. I'm figuring it out as: GPA=\frac{4}{10}\frac{\sum n_i Q_i}{\sum n_i} where n=credits of the course (here 1 credit=10 hours attended) Q=score. Here...

The scale factor in the R-W metric is there to account for the expansion of the universe. My question is whether this scale factor is put in by hand just to account for observations? Or can it be derived from more basic assumptions? Thanks.

I'm new to this stuff, so the question may be really simple, but I just can't work it right... Alright, so the question I'm trying to figure is this: The student's normal weight is 500 N. He stands on a scale in an elevator and records the scale reading as a function of time. So for the...

If you stand on a bathroom scale, the spring inside the scale compresses 0.50 mm, and it tells you your weight is 805 N. Now if you jump on the scale from a height of 2.0 m, what does the scale read at its peak? I used F=kx, and solved for k...but I don't know what to do after that...do I set...

Hi I'm in grade 11 physics and my teacher assigned a question where he asked "What does a bathroom scale measure? Explain you're reasoning" Ok for this I would say it measures normal force, according to Newton's 3rd law you apply a force on the scale it exerts a force back on you and that is...

I am designing a lab to prove that F=ma. However i am only using a spring scale, 1 kg mass, string. I have come up with a procedure where you would attach the mass to the scale and accelerate the unit upward, recording the time it takes the unit to accelerate from 0-1m and the force shown in the...

Two physics students are having a debate about the best way to define a force scale using rubber bands. Each one is trying to convince you to do it their way. They have the following apparatus to use in tests: A bunch of identical small rubber bands 10N spring scale meter stick Joe...

"Planck scale Lorentz-symmetry test theories" Amelino-Camelia new paper by Giovanni A-C http://arxiv.org/abs/astro-ph/0410076

According to the big-bang model, it is assumed that when the universe was young enough (lets say z > 1100), the density fluctuations did evolve in the linear regime. Due to this fact, one can make use of simple linearized formulas such as the continuity, Poisson and Euler equations to model the...

large scale electromagnetic hover sculpture... HELP! [really quite urgent...] Hi all! i'm a design student, trying to find out about the feasibility of a project I'm working on... http://i.1asphost.com/s2mega/magnet.jpg the concept goes like this: a "bowl" structure, lined with...