Assistance Definition and 204 Threads

Hey all. I have a practice assessment on mechanics and structures. question 1one was to calculate mathematically using the method of joint principle the magnitude and nature of the forces for all members of each frame. I have completed this part and the answers are acceptable. But for...

Hello, I have a Tungsten filament radiance source that has been calibrated in the UV region and would like to extrapolate the radiance to longer wavelengths. By calibrated, I mean, a NIST plot of spectral radiance v. wavelength at a certain set of operating conditions. I'm new to this...

Hi, I'm trying to solve an argument and hope someone can point me in the right direction. How does one calculate the impact force of a 7.26kg bowling ball traveling at 12 meters per second and impacting a single pin weighing 1.64kg. I calculated the energy of the bowling ball at 662 Newton...

[SOLVED] Help a newbie! Hey everyone. This will be my first post. A little background info: I have a bit of math anxiety due to doing very poorly with it in school despite a bit of effort. I had finished college in May with a degree that required only Statistics. My last year, I had...

Greetings! I am researching ways to set up an online observatory. I am not very familiar with telescopes, so I thought I would ask for the assistance of this community. Here are my questions currently: What kind of telescope should I get? I'd like to image planets, comets, galaxies, etc...

I am familiar with what the shear and moment diagrams should look like for a simply supported beam with one moment couple located somewhere between the supports. However, I'm working with one that has multiple couples applied to it and I'm having trouble wrapping my head around how it should...

What are the last three digits of 2007^2007^2007^2007? So far, I have tried doing it one by one to see if there was a pattern in the units, but haven't had much luck. Any help?

I am having a problem with a question, I am wondering if anyone can help me with it. A man jogs at a speed of 1.5m/s. His dog waits 1.6s and then takes off running at a speed of 3.8m/s to catch the man. How far will they have each traveled when the dog catches up with the man? Answer in units of m.

There is no answer for this problem in my textbook and since no values are given, I can;t tell how far the answer should go. Here it is: http://www.imagehosting.com/show.php/1152971_Question.bmp.html could anyone please explain? Thank you.

Homework Statement My professor set us an online quiz in IUPAC nomenclature. I managed to get all of the problems correct, except for one. The graphic shows the molecule and my attempt at a solution. http://img67.imageshack.us/img67/8673/14ne9.gif The attempt at a solution If you can't...

Folks, hopefully someone can assist me. I am a EE by education and am in the process of designing a mechanism that I need some assistance on. The basic issue I face is determining the torque needed for a miniature drive motor/gearbox for this mechanism. The problem, I think, might be fairly...

Homework Statement A skier with a mass of 62 kg starts from rest and skis down an icy (frictionless) slope that has a length of 69 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the...

Hey guys, I’m currently working with a personal water craft docking company that is trying to redesign there current port series models into something that can capture the market as well as be designed to hold future personal water crafts i.e. jet skis and there future bulkier sizes and...

assistance required for following please 3 questions that have driven me up the wall Homework Statement 0.5km2 is the same area as a)5x10*6m2 b)5x10*12mm2 c)5x10*9cm2 d)5x10*13mm2 Homework Equations 10*6m=1km2 The Attempt at a Solution 0.5x10*6= 500,000 the answer is a) i...

If anyone can lend me some assistance with sonme Abstract Algebra problems. Please e-mail me at racland@gmail.com. Thanks in advance...

Please Help Me! [b]1. I have a physics paper due tomorrow about how physics relates to shuttle launching and every search engine tells me how about the shuttle mission and nothing else. [b]2. So does anyone have any ideas that I can work off of? [b]3. Or does anyone have a useful...

I'm taking chemistry in my sophmore year, I need help with writing names or chemical formulas, to be honest I don't know anything whatsoever. For example: HOW can I possibly know that Calcium Selenide would be CaSe in chemical formula Or that (NH4)2SO4 is ammonium sulfate ? I really...

I am trying to type up some pretty equations for my physics coursework. I was told to download mathematics and have done so using winedt, however I can only get pdf documents which are f-all use for a word docuemnt. Does anyone know how I can do this?

You are sitting in a life boat at rest on a calm se, with your eye 1m above the water. A rescue ship is moving directly toward you at a constant speed of 5m/s. If the tallest point on the ship is 12m above the water, how long will the ship take to reach you from the moment when you can first see...

Hi I'm fairly new at abstract algebra and have therefore got stuck with this assignment. Hope there is somebody here who can help me complete it, because I have been ill these last couple of weeks. Its goes something like this b is a number written in base 10 b\;= \;b_010^0 +...

It has been a long while since I have had to calculate normality. If I remember correctly the formula for normality is: N=g/(equiv wt x Vol) or NAcidVAcid=NBaseVBase The known values given are the normality of the base and the volume of the base. Since the normality of the acid is the...

Which has a higher density, oxygen or air? Prove by calculations, knowing that air is approximately 20% oxygen and 80% nitrogen and that 1 mol of any gas occupies 22.4liters at STP

sorry if this doesn't belong here - please feel free to move it to the proper section. im looking for a good book/reference material that would be helpful during a year of HS AP calculus. something that will supplement the school material and help me better understand it as we go through it...

I'm interested in understanding the physics of infinite LC ladder networks (not homework or coursework). There's a paper that looks good on the subject in the American Journal of Physics, but I don't have a subscription. Could some kind soul who has an unlimited subscription (so it wouldn't...

Question: Assume that a sound pulse travels with a constant velocity of 1,000 meters/second and that point A is separated from point B by a distance of 1,000,000 meters. Compute the time that elapses between the moment the sound pulse is transmitted at point A, strikes the object at B is...

hey can anyone help me with this problem... three pounds-mass per second of air is reversibly and polytropically (n=1.48) expanded in a gas turbine from 2100F to 900F. if the exhaust pressure is 15psia, determine the work produced per pound-mass of air, the power generated, and the rate of...

Hey guys, I was doing some practice free response questions for my upcoming AP Calc AB test but was somehwhat unsure of this one. ------------------------------------------------------------------------- Sand is removed from the beach at a certain rate by this function R(t)=...

Compute the sum from k=0 to infinity of (k+1)(x)(1-x)^k. I don't have any ideas about how to start this one, except that perhaps it resembles a geometric series? Also we're supposed to use the power series for 1/x which we know to be (1-x)^k. (That's all I could figure out on my own so far)...

Howdy, I've come up with an idea that I think is feasible and, if so, useful and possibly lucrative. However, I've got no serious engineering or physics background and am thus looking to get some assistance with my project. How do I go about finding someone to assist with this project - to...

Could someone please point me forwards again. By integrating the following equation twice... \frac{1}{x^2}\frac{d}{dy}(x^2 \frac{dx}{dy}) = 0 I tried integrating by parts but came to a sticky end. many thanks skook

Hi I have been given this following problem: X is a stochastic variable with the distribution Function F_X which is given by: P(X \leq x) = F_{X}(x) = \left\{ \begin{array}{ll} 0 & \textrm{if} \ x>0 \\ \frac{{1- e^{-x}}}{{1 - e^{-1}}}& \textrm{if} \ x \in [0,1]\\ 1 & \textrm{if} \ x \geq 1\\...

I received a homework problem that I need guidance on where to start. What is the longest vertical soda straw you could possibly drink from? I do not know where to start on this problem. A small push in the right direction would be greatly appreciated.

1. If a comet has an eccentricity of 0.98 and a semimajor axis of 12 AU, what are the apehlion and perihelion distances? What is the period? How does the velocity at perihelion compare to the velocity at aphelion? In this problem, I used the perihelion and aphelion equations to solve for...

Ladies and Gentlemen This is from my class work and i was not there when the teacher did this.I want to understand this.Please assist A car with a linear momentum of 3.0 x 10 raised to 4 KG x M/S is brought to a stop in 5.0 sec.What is the manitude of the average braking force? I really...

who can help me? I want this paper "QCD and resonance physics. theoretical foundations" by M. A. Shifman, A. I. Vainshteinstar, filled and V. I. Zakharov who can email it to me?or tell me a website to read full text? Thanks!

Hi , is anyone studying gear ratios?? i need some help with calculating the final gear drive.. i've calculated it at 94.97:1 is this correct??

Any error analysis gurus out there? I'm trying to work out the uncertainty for the following equation: C = \sqrt{(A-B_A)(P-B_P)} A and P are counts from a radioactive source from two opposing detectors. B_P and B_A are background counts with no source present. It's a simple geometric...

A stone is projected from a point O on a cliff with a speed of of 20ms^-1 at an angle of elevation of 30. T seconds later the angle of depression of the stone from O is 45. Find the value of T. I assumed that when the stone is at depression of 45 degree to O, it has reached the horizontal...

Here's my first question: A 3.3 kg block is pushed along a horizontal floor by a force F of magnitude 20 N at an angle = -40°. The coefficient of kinetic friction between the block and floor is 0.25. (a) Calculate the magnitude of the frictional force on the block from the floor. (b)...

Hi I really need help for this problem: A mass is tethered to a post and moves in a circular path of radius r=.35m on an air table -friction free- at a constant speed v=18m/s. We employ the coordinate system ( classic 2 dimension space). If at t=0s the mass is at θ=0o, a-what is the...

ok i am in serious trouble in my math class alos in spelling some of u might think of my word dier i don't think that's how you spell it but whatever. as i was saying i am totally lost in my class not to mention my homework :cry:. Could someone just define function, domain, range, and how to...

Do you have any suggestion to help this chimp?

How do I go about finding the equivalent expression for cot 50 degrees? When I work the problem, I come up with tan 130 degrees. Where am I going wrong?

Hello, I've enjoyed reading these forums for a while now as they have lots of great insight! Today I decided to register so I can ask a question that's been bothering me for a few days now. (By the way, I'm moving onto my senior year as a physics major) So yea, to the question. I have been...

Hello, After a few hours of searching for an active physics message board, I was so happy to find this one and I am hoping for some assistance :smile: I am not looking for homework answers, I have already completed this assignment to the best of my knowledge. I got my paper back today...

Hey I am in need of some assistance. In a problem I need to transfer Joules to quanta but am unsure on how to do it. A radio station is going at 200 KW with a frequency of 103.7 MhZ. So 200,000 Joules a second need to be converted to quanta. Thanks in advance!

Two long, parallel wires hang by 4.00-cm-long cords from a common axis. The wires have a mass per unit length of 1.50×10-2 kg/m and carry the same current in opposite directions. What is the current in each wire if the cords hang at an angle of 6-degrees with the vertical? Basically,,,,,I...

I am working on a project for graduation and I am writing a paper on rail guns, but I am having trrouble understanding the basic principle behind it, Loretnz Force. I've tried to look online for a good site that explains it in laymens terms, but I can't seem to find one. I know that current...

Hi, I carried out the integration until the very end...I don't know how to convert the variable back to the original one. :confused: \int_{R_{0}}^{R(\Theta)}\frac{du}{u\sqrt{a^2-u^2}} Let u = a\sin{\Theta} du = a\cos{\Theta}d\Theta The integral becomes...

I have a problem... Can you help me ?... :confused: I need to calculate the n-derivative of a function of z (complex number)... n derivative of complex function of a complex variable Thanks, fellows ! Looker