Figure Definition and 590 Threads

I needed help figuring out the formula for a sequence with these conditions: 1. The first term is 1. 2. All terms are positive integers. 3. 3 times each term (3*a_n) must be greater than the sum of that term and all the terms before it, but no more than 3 greater. Operators like ceil() and...

But not for the reason or application you might think...lol I live in SE Texas, just south of Houston. It is hot as balls here in the summer. (Which accounts for three of our seasons here) My neighborhood is on a "community well" type water system, and the well is in the back of the...

Homework Statement Two springs which have spring constant of k1 and k2 respectively are vertically hung in a series. Then, a mass m is attached to the end. Find the displacement and the spring constant of this series. Homework EquationsThe Attempt at a Solution I got the displacement x1+x2...

Homework Statement We've got an object/person in the center of a cicrcle that spins around with an angular velocity ω. That same object is moving at a constant speed k with the direction of the radius, that is from the center to the outside of the sphere. That object describes then a spiral...

Homework Statement I'm trying to do this limit based on a previous thread ( https://www.physicsforums.com/threads/proving-n-x-n-e-x-integrated-from-0-to-infinity.641947/#_=_ ) I got up to the last part of thread where I need to find the limit of: limit as x approaches infinity of...

I'm taking a trip aboard the Shanghai Transrapid Train. The train maintains its maximum commercial speed of 430km/h along a straight. I position myself at the centre of my carriage and jump straight up at 2ms-1. How many horizontal meters am I displaced along the aisle before landing...

The side by side coils are round or oval, and wired together in series. Let's say the side by side coils are wound opposite (one clockwise and one counterclockwise) to match the direction of travel of the twisted coil's loops. Each of the side by side coils has the same number of turns as the...

Hi everyone, 2 days ago at 10am in Monterrey Mexico i looked at the sky and saw this strange lights, and i want to know what are they. Can some astronomer help me figure out what are they? Note: These things are not product of the lens of the camera, i saw them with my own eyes. My deduction is...

Homework Statement Homework Equations / 3. The Attempt at a Solution Here is my attempt from the homework assignment. It doesn't appear that I got any points for this question and was hoping to get a little help in correcting my issues or pointed in the right direction to start over. [/B]

Please bare with me as I'm a beginner with this stuff, and am just learning lol But I was wondering if I did the right math to figure out the momentum of the Space Shuttle. Linear Momentum, in classical mechanics, is the product of the mass (the measure of an objects resistance to acceleration...

Homework Statement the limit x->a of [(x+2)^5/3 - (a+2)^5/3] / (x-a) Homework Equations limit laws The Attempt at a Solution [/B]

I understand that the acceleration of the universe's expansion was discovered by looking at very far away Type 1a supernovae. My question is how was the data used exactly to calculate the Hubble constant in the past and then compare it with today's value? Did they simple plot the distances...

I am hoping someone can assist a non engineering person figure something out and is probably the oddest question you will get. I have built a life size version of Han Solo In Carbonite (HIC). It is 80 inches tall and 32 inches wide at the base. It weighs about 125 pounds with most of the weight...

Maybe, it's a useless question. The figure which I'm talking about consists of two parallel lines each of length 'b' and are separated by a distance 2r. Their ends on one side is closed by a semicircle which in pointing inwards and decreases the area and the ends on the other side are joined by...

Hi all, What is the tool which can add my Listplot graph like: to an experimental figure as following: such that the (x-y) axes coincidence in both figure and graph: Actually I tried Mathematica as: data27 = Import["~/Events/scan.dat"]; idata27 = Table[{data27[[i, 2]], data27[[i...

Hi, I need to figure out how much weight a 5 foot steel pipe will support before becoming unsafe. I am building a series of out door pull up bars for my neighborhood as an eagle project. I need to buy the right pipe/tube that will be sturdy enough but not have too big of a diameter that you...

I'm studying for my physics exam and there is a figure on the book physics for scientists and engineers 4th edition by giancoli that i just don't understand. I know that the electric field of a negative charge points toward it and the electric field of a positive charge points away from it Also...

Homework Statement Convert ##120. \frac{km}{h}## to ##\frac{m}{s}## Homework Equations ##1 km=10^3 m## ##1 hour = 3600 seconds## The Attempt at a Solution Not so much concerned with the solution, it's easy, as to what happened after the solution was found. So you get ##33.33\overline{33}##...

I am using a Tascam recorder to record an environmental nuisance noise that is occurring in my home. I then use Virtins Multi Instrument Software, which includes an oscilloscope, band pass filter, and a spectrum analyser. Noise source is probably machinery at a legal marijuana grow op. That...

If you aren't already aware, there are some folks who use a couple million volt particle accelerator to make lichtemberg figures in acrylic. If you watch some of their videos over at http://www.capturedlightning.com/frames/lichtenbergs.html#Make it looks like they only leave the acrylic under...

Hi all, Do anyone familiar with these analysis of cross section ? I wonder how to find the cross section of ( p p ## \to \gamma \gamma## b b~) (blue region) in the opposite plot, the y-axis is the number of events divided by 100 GeV with luminosity = 100 ##\mbox{fb}^{−1 }##.. The Fig. from...

So I know that you can't round off numbers in a longer calculation. (in physics) but how is this with adding and subtracting. For example 52,32*13=680,16 -> 680,16/123=5,529...=5,5(because of the 13) but what is correct when adding inbetween 530,014+0,01=530,02 ->...

Homework Statement "Find the magnification of the following system: A diverging lens with focal point -9.5 cm is placed 4.35 cm to the right of a converging lens with its own focal point of 13.0 cm. Parallel light enters the converging lens from the left." Homework Equations M = -p/q 1/p + 1/q...

I'm only a uni student at the moment and this feels more like something you learn from experience than something taught in a lecture but I'll thought I should ask anyway. Is there an easy way to select materials for engineering projects? I was hoping to find there is a nice dictionary sized...

Homework Statement Trying to come up with an equation of V_D in terms R_S, R_d, R_D, V_i, G G is a constant Homework Equations Sum of voltages around a loop = 0 Sum of currents at a node = 0 Voltage divider Current divider Resistance of resistors in parallel The Attempt at a Solution...

Hi, so for example in the figure below the missing mass squared has been calculated under the assumption of the detection of a pi+ particle decaying from a K+. What I am wondering is what is it that's bounding all the decays at 0.122 GeV2? And for the decays at all, what is e.g. bounding the...

I have no idea what is this

Homework Statement A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest...

Programming with Fortran77, I got some problems during coding... How can I set to be the value? For example, I want to the value 'a' set to be 0.0000045. But, in command window, value of a is set to be 0.000004499876895. How can I set to be the value 'a'? In my case, I command the real value...

Hey so I'm getting the error message: Euler_Method.f90:43.1: fun=(c)(1-c)/(d+2) 1 Error: Unclassifiable statement at (1) And here is my code: PROGRAM Euler_Method !------------------------------------------------------------------- ! The purpose of this program is to read in endpoints...

Homework Statement Three blocks of identical mass are placed on a frictionless table as shown. The center block is at rest, whereas the other two blocks are moving directly towards it at identical speeds v. The center block is initially closer to the left block than the right one. All motion...

I'm in college working towards a degree in Mechanical Engineering, so far I've only made it through physics 1 and calculus 2, but I've been building race cars and pulling trucks and tractors since i could hold a wrench. I work for a guy that builds super modified four wheel drive pulling truck...

I have always felt that the inflationary period immediately following the 'big bang' is a contrived theory, and this leads me to ask if the speed of light has always been the same figure. The reason I ask this is that to explain the initial rapid expansion, I wondered if the speed of light...

Hey PF! So I have a pretty weird situation, here is what's up: I am 2 semesters away from finishing either a math OR physics degree. I recently came to the conclusion that I want to make a lot of money and am trying to figure out what I want (or am able for that matter) to go to graduate school...

I came across an equation used in one of the forums from a few years ago. Found here: https://www.physicsforums.com/threads/calculate-how-long-it-will-take-for-the-ice-to-melt.531908/ I am researching a similar topic into melting ice and using it as a cooling solution. However when i came...

I want to present a picture which was taken from a paper in my thesis. Can I simply write at the end of the figure caption "(taken from [reference])" or should I get an official permission from the paper's author?

Homework Statement As I reading this article I conflict with a problem, I never find the meaning of Figure 3(b). the paragraph below the figure illustrated it but I couldn't find what it want to say. every help will be a appreciated. Homework EquationsThe Attempt at a Solution

We have a cube with sides of 10mm (fig a) (in the same material than the exercice 1 (have poisson coef & young's modulus) A- figure A 1- Write the stress state and the relatives values deformations (tensor) 2- Why the sum of relatives deformation is equal to 0? B-Figure...

Can anybody tell me which book is this one, if you can tell from the figure below?!

I want to create figure that is enlarged, I use: fig = figure(1);%These two lines maximize the figure dialogue set(fig,'Units','normalized','Position',[0,0,1,1]); Then I use zoom(1.9); to enlarge the figure The dialogue is enlarged. But I want to reposition it just like use the "pan" button...

I have asked multiple electricians this very question and none of them had an answer. I am working on a project right now that hinges on the control of electrical temperature. This is my first post, thank you in advance.

"The uncertainty should be rounded off to one or two significant figures. If the leading figure in the uncertainty is a 1, we use two significant figures, otherwise we use one significant figure. Then the answer should be rounded to match." "Here’s a rule of thumb you can rely on: round the...

Homework Statement A ball is thrown down with an initial velocity of 2.0 m/s from a height of 1.75 m, determine how long until it hits the ground. initial velocity = 2 m/s distance = 1.75 m acceleration = 9.8 m/s2 time = ? Homework Equations d=vit+1/2a(t)2 The Attempt at a Solution 1.75=2t +...

Homework Statement The figure below represents part of the performance data of a car owned by a proud physics student. (The horizontal axis is marked in increments of 2 seconds and the vertical axis is marked in increments of 10 m/s.) (a) Calculate the total distance traveled by computing the...

Why is it that only one significant figure for any uncertainty is taught? It seems like a nice general rule, but isn't it an unnecessary constraint and ultimately a poor rule in many cases? For example ## 5 \pm 1 ## could mean an error of either 0.5 or 1.5, which is a very large range. Wouldn't...

Homework Statement In hot pursuit, Agent Logan of the FBI must get directly across a 1200-m-wide river in minimum time. The river's current is 0.80 m/s, he can row a boat at 1.60 m/s, and he can run 3.00 m/s. Describe the path he should take(rowing plus running along the shore) for the minimum...

Picture a large ring floating in space. It is rotating with angular momentum L. However, its radius is so large that it has essentially no tangential velocity or momentum and therefore no kinetic energy. The total energy is mc^2, with m being the invariant mass. It then begins to draw itself...

Hi, I'm looking for a great software for drawing illustrations in physics (Graphs, geometry, box drawings, integral and area 2d Graphs) and perhaps some trigonometry (triangles, Graphs, unit circles with angles/degree). I'm on a windows computer and the purpose is for making textbooks and ebooks?

1- Let the linear operator on R^2 have the following matrix:A = 1 0 -1 3 What is the area of the figure that results from applying this transformation to the unit square? 2- I am abit confused here, I thought that the matrix for the unit square would be, 0 0 1 0 0 1 1 1... But...

Say I get married, the odds of me getting a divorce in a year or less are 11.5% and the chances for divorce for marriages between 1-5 years is 15.7%. My first question is, would adding them up be a good approximation for the odds of divorce in 5 years? Bearing in mind that the total number of...