Hey Definition and 109 Threads

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I am honestly not sure where to start. Please give me a hint on how to solve this problem. Thanks!

Hello y'all! I'm a high school student and I'm looking for some advice:) I am very interested in physics, quantum mechanics in particular. I'm a bit of an overachiever, and I usually overthink everything. I come from a family of doctors, and although they don't pressure me into following in...

Hey guys, I'm going to say right up front that I haven't a clue how to do these calculations, but I have a scenario that I would like the math to if anyone can help me figure it out. What I had been able to attempt to figure out doesn't seem tangible? The formulas I had researched/used was...

Hey there. I'm a new member. For the past 20 years I have worked as a computer programmer (SAS language; clinical trials stat programming). A few years ago we moved to the beach and now I teach math at the local community college. I always enjoyed math and physics in high school and college...

my name is Angie, in high school I suffered anxiety, my performance in class was non-existence. which lead me to believe I was "dumb" .. Now that I am in my twenties I realize after " finding myself" I want to be a registered nurse. so here I am upgrading my grade 12 courses. I finished...

Hello electrical engineers and hobbyists of PhysicsForums! This is my first post (I think... I might have posted before) and I am a junior-year EEE student at a local University. I have some free time this summer and want to study/review some concepts to be fresh when I need them for my...

Hello guys I'm a new member, I joined this website because I am interested in discussions about physics. That's about it.

HO! I am new here. HUZZAH! WOOOOOOOOOOOOO!

Hey guys I am an AP Physics high school student who hopes pursue STEM in college and career

hello everyone, can someone help me know where I can take a course in astronomy / cosmology on the Internet where you get recognition and diploma and to get on with my passion of the universe? This means a lot to me and I want to move on in my passion. thanks

i want something to be fitted in a gas tank on one side that will slide and compress the gas present in the tank

guys i just wanted to know the formula by which i can calculate the thermal efficiency of a pass out steam turbine( a steam turbine with an extraction for process ) I've attached a simple diagram explaining my problem can anyone please help !

I want a design for a small 15 cm long beast wolf I can use- -wires -motors -rubber bands -cardboard -matchsticks :thumbs:

We are having the tires with internal dia of 12inches and disc of 190mm Can someone suggest me the caliper we can use? 2. Should we use single cylinder or double cylinder calliper??

If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...

If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...

If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...

If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...

If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...

If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...

Homework Statement Let f(x), g(x), and h(x) be polynomials in x with real coefficients. Show that if (f(x))^2 −x(g(x))^2 =x(h(x))^2, then f(x) = g(x) = h(x) = 0. Find an example where this is not the case when we use polynomials with complex coefficients. i have no idea where to start...

Ive been thinking about the movement of things recently. How we measure things here on Earth but for some reason we don't add up all the variables... its kinda weird. So here is a general question that has been giving me a big ache. So, for instance, If particles can be accelerated to...

Hey guys, I'm having a difficult time over here. I think that my friend is going to drop out of grad school; he really seems to dislike his advisor and his colleagues. Apparently they are all rude to him and a few have even tried stealing his work. More recently his ex told him that they were...

Alright. Physics Internal. I am investigating a physics principle applied into a practical way. Radar Guns and the Doppler Effect. Now the issue is, firstly, that I have encountered two equations to give me the perceived frequency of a wave with a moving observer and stationary source. I am not...

So I was thinking of swapping the following classes together, and I would appreciate an input from your guys first. I want to swap General physics 1(trig/Algebra based) to Intro to C++ and the reason being that I will be taking my classical mechanics course next semester anyway, so why...

So I have a list of "optional electives" for my math degree which I am about to finish. I've held off on these courses and finished up all my mandatory courses; analysis, ODEs, group theory etc. I have some fourth year courses to finish (PDEs, dynamical systems, lie algebras) and I have to pick...

Hey guys, I have to admit that my knowledge of this stuff is probably quite lacking in comparison to most other people's but I was wondering if anyone had some resources I could use to look into regarding nonlocality? From what little I do know about Quantum Mechanics is that Einstein had...

Hey, I was reading Neil Turok's book (The Universe Within) and it got me thinking about E=mc^2. Here's what I came up with (keep an open mind):

Yer.. I'm lazy and tired, did not enough research and found out that the radio/electromagnetic wave makes all the electrons move back and forth when the wave oscillates between the magnetic and electric fields... so you can see how much the current oscillates etc. But... um cameras work...

Homework Statement Path between O=(0,0) and P=(0,4) for which the integral int. O to P (x (1-y'^2))^(1/2) dx becomes stationary. Homework Equations http://en.wikipedia.org/wiki/Calculus_of_variations#Example The Attempt at a Solution Okay guys, so mimicking the...

hey anyone please can tell me this one: A=lim(e^(1/n*logn)) (n tends to 0) i took log on both sides and then by using l hospital rule i arrive at lim(-1/n) (n tends to 0) can't solve further...please help

Hey guys so I've been having some trouble with this question... How many nanoseconds does it take for a computer to perform one calculation if it performs 6.9 × 10^7 calculations per second?

I=mr^2 I know moment of inertia depends on how for a object how far a bit of mass of that object is from the axis of rotation. i.e. farther from the axis = higher moment of inertia-= more torque is needed to cause rotation. this just doesn't make any sense for the seesaw example, on the seesaw...

This question may have been asked hundreds of times before in one form or another. If that's the case, simply point me in that direction but please read through what I have to say first. I am finishing up my second semester as a physics major with my science courses being: Physics 201...

Homework Statement An electron and a proton each travel with equal speeds around circular orbits in the same uniform magnetic field ( I tried to attach a diagram...not sure if it worked but I've described it anyways). The field is into the page on the diagram. Because the electron is less...

Hey all, I really need help with this homework. Any help would be appreciated(FIXED) Problem: Ball of mass m hangs on a string of length L straight down from a cart of mass M standing on horizontal rails. The cart can move along the rails without friction. While the cart is at rest, the ball...

You want to know what really grinds my gears? When these idiot businesses require you to submit an "inquiry" to request the price of something so you can buy it and they never even bother to respond to you. I've spent a good 20 hours of my time this week dealing with these numbskulls that don't...

hey everyone my name is jillian and i just want to say hello to all

Hey, so I am just working on a second year Analytical Mechanics assignment, and right now dealing with oscillations. I have two questions I am stumped on and don't know if I have it right. It is probably basic, but just checking. 6. The frequency fd of a damped oscillator is 100 Hz, and the...

Hi everybody, thank you in advance for all comments/help. First off, I know I am new here, but a friend of mine is a casual on this board and he suggested I try it for help. I have just begun a 2nd year university introductory to mechanics class, and I have an assignment due tomorrow. I...

This is the first time I've ever heard these words from a professor: "Hey, bring your laptop! (To the tests) Use maple/mathmatica/excel! That's what it's for!" This is from my probability professor. *glee* My calculator actually performs all the necessary functions, with convenient menu...

Homework Statement The Half life of the isotope 24Na is 15.00 hours. a stock solution of 24NaI contained 16000Bq of activity in 25cm3 at 5.00 pm on the 2nd of june. An experiment starting at 8:30am on the 4th of june requires 1kBq. What volume of the stock 24NaI solution would be required to...

Just saw this article here about it being announced on 20 July of this year, 2011! http://en.wikipedia.org/wiki/S/2011_P_1

Hey guys, So I have been playing with LogLogPlot in Mathematica and it seems to me that PlotRange->{a,b} does not work. I also tried Show[%,PlotRange->{a,b}] but somehow my axes got cut off. Anyone knows how to do it if I want to display a certain area of a log-log plot?

Hey guys, I'm looking for some sort of mosfet/relay/switch that can handle up to 1 milliamp and 8kV. I don't understand the technology very well, but from talking to some people, I know I can put 2 4kV mosfets in series to achieve my 8kV goal. On the other hand, while looking for relays, I...

Hey there, I've been learning about AC circuits recently and while considering and LCR circuit it occurred to me; it's possible for the voltage drop across a capacitor/inductor/both to be greater than the voltage source itself however I can't think of the reason for this, any hints or reasons...

hey v-day chat is up. anyone game?

Homework Statement Prove that for every natural number n we have that 4^(2n+1) + 3^ (n+2) is divisible by 13 Homework Equations The Attempt at a Solution im not too sure any help or anything please

Hey. First of all let me make a few things clear. Firstly, I didn't know weather to post this question here or in the "Academic Guidance" board since it my issue has elements of both careers and academia involved. Secondly, I understand that you probably get a lot of similar questions to mine...