Reading Definition and 614 Threads

I've always gotten this impression from reading books and in history that a hundred or so years ago there were these guys that through their great inventions (especially later in the Ind. revolution?) that became socially accepted and revered as "inventors" and it was a pretty big deal and...

Say that an object is placed on a scale and it gives a reading. Does that number represent the object's weight (w = mg) or mass (just m)? I'm a bit confused because my physics teacher told me that it is measuring its mass...is this correct? Many thanks.

on pages 14-15, in deriving the normal vector to a surface, they use a plane to cut the surface (the plane is parallel to the xz plane) then use the curve 'c' in the xz plane (this curve being where the plane intersects the surface), draw a tangent vector 'u' and want to use the components of...

I keep encountering people who think "critical" means carping or fault-finding, and nothing more. So it would seem that the critic's pen, once mightier than the sword, has been supplanted by the ax. Yet I have always maintained that the critic has three duties: to write as well as a novelist or...

Hi all. How to read the following plot? Thanks.

Hi everyone, I've been searching and googling for the answer to no avail, so I'm just wondering if anyone at PF could help me out. It's for my work assignment, by the way. I have two power meters connected at two ends of a transmission line (assume it's 33kVAC). At each power meter, there...

Ok, so I am having help knowing when x,y,z are positive or negative. My graph looks something similar to this.. -------------z---------x -------y ---------------------y ---x --------------z I am really confused as to when...

Hi, I am new to the forum, apologies if I break any rule posting a new thread. I could not find the answer in similar threads came up after searching the forum. I want to read a formatted file of six column data. Reading works OK, but I want to put it into a do loop with the repeat as many as...

I put up a security gate requiring a code at the entrance to my property 6 months ago but the electric company has never requested access to read my meter. I have an old fashioned non-digital meter that cannot be seen from the road. My bill references a specific KWh usage. How does the power...

Can some one Fully explain reflection for me, because i am reading my book and i read about wavelets and I DONT UNDERSTAND THAT, so can some one explain it all PLEASE

learning C++ by reading the code of open source projects? Is there any resource that teaches C++ by taking an open source project (at the level of quake 3 for example)and explains the code step by step for some one who only knows the very basics . In my opinion It will be very efficient . I can...

Hi all I am using some code that was originally written in F77, but as it is many thousands of lines long, I haven't the time to go changing it. There is one section of code that refuses to work, but I'm assuming it must have at some point since the code has been used in the past...

Hi, If I have three light quark flavours with massses m_u, m_d,m_s , I want to try and calcuate the masses of the eight pseudogoldstone bosons. I have found from my mass term in the Chiral L that: L_{mass}=-2v^3...

I am trying to read and display the content of a text file in Fotran 90 to make sure that fortran is interpreting the data correctly. Eventually I want to store the data in an array so I can calculate averages, but at the moment I am still working on getting the data displayed in Fortran. I've...

Greetings! A little about me first: I'm an above-average Junior in high school in the US who loves Maths and Physics. Since I was a child, I was never told how to read (I never read much, really...) I taught myself to pronounce the words out loud in my head, and this habit is really bad...

So I'm starting to review Calculus and I was wondering what you guys do for taking notes from textbooks since I don't normally take notes and I would only read the text when necessary. I am debating taking the following options: Just reading the book (probably least effective) Reading and...

Homework Statement Predict whether heat is lost or gained by a gas, and whether work is done by the gas or the gas does work on its surroundings, given a P-V diagram. Homework Equations The Attempt at a Solution I'm trying to understand how to read a P-V diagram and am wondering...

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...

I was trying to write code that would read integers stored in a file, line by line and then save them to a list and average that list and display it, it didn't work. What can I do to correct this code, I believe that the error is in how I am treating the list but I am confused at why the...

Homework Statement A person struggles to read by holding a book at arm's length, a distance of 45 cm away (near point). What power of reading glasses should be prescribed for him, assuming they will be placed 2.0 cm from the eye and he wants to read at the normal near point of 25 cm...

I have £25 or $40 worth of book tokens to spend. I normally don't read fiction books and was thinking of getting a scientific or engineering orientated book that I could read without having a degree in the relevant subject? I like electronics and physics and had though about either getting...

As the title says I'm looking for reading suggestions for complex analysis. I'm a novice at the subject and looking to do some self study to bring myself up to a graduate level of understanding. I've been looking at some reviews on Amazon on such books, but I think I would rather hear your...

Hi everybody, I have 3 columns of data (3 different variables) and 400 rows. How would I set up a matrix/array sort of thing to read each row individually and store it in my fortran program to calculate equations at each step? What I have basically tried and can't get to work, I think it...

I've got a question about interpreting these - mainly about how the horizontal axis works. See attached file - On the leftmost panel, it has a form of the wavevector q plotted from left to right, labeled as (000) on the left and (100) on the right. What does this mean? Does it mean that...

Homework Statement This is assignment is on FORTRAN 90: In an assignment i have, i am to enter a date in the format DDMMYYYY, and its suppose to compute and display the day of the week that date falls on (based on a given algorithm). I was able to code a program that would give me the right...

i am reading about differencial exact form, and i don't understand why d \theta is not a exact... i think that is because d \theta is not a total derivative of some function, since d \theta = \frac{1}{x^2+x^2} (-y dx+xdy) is not definned globally in x,y = 0,0... ¿is correct?

Hi I am novice to programming and trying to read each character from file till white space [next line / space] and append symbols to the read characters. example: say I have string how are you doing sir then I should read it into char buffer as char buff =...

hi want to read the rows of a matrix from a file which are written in the following way : (2:1,3), (4:3,1), (2:1,8) i am working in java, i am not able to figure out how to do this using bufferedreader :( can someone help? Thanks

http://www.smh.com.au/technology/sci-tech/mindreading-technology-reconstructs-videos-from-brain-20110923-1ko5s.html ::I can't locate the primary source:: Didn't want to put this in skepticism or another sub section.. too interesting. Move if wrong thanks.

Hi all, I am reading a paper related to astrophysics and I am stuck in a step in a calculation. It is about orbiting gas in a spiral galaxy and it calculates the errors in the fitted rotation velocity if one of the viewing angles is incorrectly estimated. My problem is that I don't understand...

When I was in 8th grade I found that I had a bit of a talent for writing, and it seemed to come out of nowhere. I'm not the most outspoken guy, but I have no trouble with writing. I find it to be an easier communication medium than speech (although I will not deny that speech is the most...

((Not certain this is the right place)) Hi guys, Currently I'm voluntarily undertaking a project qualification and have decided to write a report on Nuclear Physics and how it could be used as an energy source in the future. I already know quite a bit about this topic but was wondering if...

I am newbie to programming , I am trying to write a program in c++ to read strings from the file until white space [ space/ newline] each time i encounter white space i append to the string read append a symbol "$" and push to the buffer. and for the same string append another symbol "(" and...

Is reading the Principia a good idea as a supplement for my physics Mechanics class I will be taking this year. The class is a 1st year class btw, I feel by reading it along with my textbook and lectures I will be able to develop a very deep understanding of Mechanics. Do you guys think it's a...

In a course at a college level, if you read the textbook from front to back instead of just using it for reference it seems to not help the grade? What do you think? P.S. EDIT: and just put this in a reply to the first person to answer: That, the book must be EVIL: The teacher told us, you...

I am about to go back to school and need to retake just a ton of math that I completely forget. If I had to guess I'd assume ill even need algebra 1 again. So I am thinking about this on the way home from work last night and had a thought. I play drums. I, due to living in a condo for 6...

These are the books that i have decided to study from for my PGRE...Any advice and recommendations are needed... Fundamentals of Physics : Halliday, Resnick and Walker Introduction To Electrodynamics : David J. Griffiths Introduction To Quantum Mechanics : David J. Griffiths Optics : E...

When I put an o-scope probe into my (120VAC) wall socket, with no ground (reference) attached, just a single wire, I get a perfect 60 Hz sine wave, with about 35Vrms magnitude. When I plug the o-scope probe into the socket with the ground attached appropriately to the return of the same...

Homework Statement 8. Below is a graph of electron energy v light frequency for platinum. Record and identify the following on the graph. • The threshold frequency. • The range of frequencies that give an electron a kinetic energy greater than zero. • The range of frequencies that...

When we take down voltmeter readings from the terminals of a Rectifier (rated 12V), we get the voltmeter reading as 4.5V. Does that mean the rest of the voltage is lost in the form of voltage drop? or is it because of the current drawn by the load? I would be glad if someone could please post...

inf{(-1)n+1/n : n=1,2,3,...}=-1 I was reading about Infinums and Supremums, when I saw this problem. How did they get -1 as the Infinum?

Hi, I just started reading "The Elegant Universe" as an introduction to physics. Up to this point I thought I understood everything but now I get a to a part that doesn't make sense to me and was hoping someone could explain it. If you have the book you can follow along with what I am...

Hi Folks, I am currently reading Brian Greene's 'The Fabric of the Cosmos' which is excellent. I am trying to get my head around the Delayed Choice Quantum Eraser in this book. Is there a website link I could follow up that explains it well? I have already looked at...

Hi, I'm a raising college sophomore. I took Calc I through IV in high school and I'm on track to major in a completely different field (non-science) which I also love at a fine arts school which doesn't have a math dept. After college, I want to get a PhD in Math. To gain admission and...

I remember reading somewhere about how a wormhole let's you see yourself 10-30 years ago, I don't understand how that works. I knew they are a 'shortcut' through space time, but is it because your traveling a distance so large, but technically your just going through a much shorter distance...

Hi. I have a file like this: 1990 01 01 0000 27 16 1990 01 01 0100 25 15 1990 01 01 0200 24 16 1990 01 01 0300 24 16 1990 01 01 0400 22...

Is it any good? I mean scientific papers on arxiv. I'm contemplating buying some kind of tablet vs kindle dx for this purpose.

Question 1: solved! Question 2: Why it's zero? I think we cannot get zero unless it's an exact differential form? Many thanks.

Hi All, Let me preface by saying this is my first post, but I'm very glad to have found and joined what looks like a great community here. Also I have no Fortran experience, so please bear with my greenness: I'm trying to resurrect and use a code written by another engineer in our...

I own a copy of Griffith's Quantum Mechanics and I like how it is written very much but while skimming through Griffith's Particle book I saw a reference that said "at the level of Park" and I decided to investigate. I started to read through it and the text is structured the way most books...