Stuck Definition and 836 Threads

Homework Statement Derive the compton equation. Homework Equations \lambda` - \lambda = h/ mc (1 - cos\theta) E = hf = hc/\lambda The Attempt at a Solution Okay, I'm sorry this is so long, I'll try and make it as concise as it is possible for a whole blather of random crap to...

hello i am stuck on the following: A=cos(-20)-K1-K2cos(-20)+K3 K1=3.825 K2=2.295 K3=2.514 A should equal 2.922 but somehow i can't get it to equal that i have tried using my calc in radians and degrees mode but neither come out with the right answer please help me!

Hi, I was trying to solve the following integral, but i don't seem to get anywhere. \int_{0}^{\infty}ln^2(\frac{x^2}{x^2+3x+2})dx I played around with it, but got to a dead end each time. At some point i get to integrating the following, which seem equaly difficult: \int...

a block of mass 2.0 kg is placed on a compressed vertical spring that is compressed .050m. (The spring and the block are not attached) The spring is released, and it propels the block vertically upward. when the block has risen .60m abovie its initial position, its velocity is 1.7 m/s. how much...

Homework Statement what is the limit of as x approaches 9? Homework Equations The Attempt at a Solution I'm stuck please help...

acceleration. linear motion. I'm stuck! Homework Statement a train moves at a velocity of 60 m s-1 and stops after a distance of 600m. what is its deceleration?Homework Equations v=s/t The Attempt at a Solution this is my working: u= 0 m s-1 v= 60 m s-1 s= 600 m v=s/t 60=600/t t=10 s ...and...

What animals can naturally expel small nonselfs which penetrated into their flesh and were stuck right there from their bodies? I wish to mutate to be so, who can help me?

Homework Statement http://www.webassign.net/walker/p11-78alt.gif An 85 kg person stands on a uniform ladder that is 4.3 m long and weighs 65.0 N. The floor is rough; hence it exerts both a normal force, f1, and a frictional force, f2, on the ladder. The wall, on the other hand, is...

One cold winter day, a tractor gets stuck in a ditch. The operator hooks a tow chain to a nearby tree and attempts to move the tractor by jumping up and down on the chain. If the chain is 10 meters long and is stretched level one meter above the ground, and the tree is stationary, how far does...

Homework Statement What minimum energy is required to raise a 1.7e3 kg vehicle from the surface of the moon to a height of 5.22e6 m? Homework Equations Ep= -G(m1m2)/r The Attempt at a Solution Ep(initial)= -6.67e^-11(1.7e^3 x 7.35e^22)/1.74e^6 = -4789750000 Ep(final)=...

Can someone give me a hand with these questions because I am really stuck on these! I am stuck on both these questions, I have no idea where to begin I was given a worksheet which our instructor will review with us but I would like to know how to do them before class. I finished most of it but...

Homework Statement the barrel of a rifle has a length of 0.916m. a bullet leaves the muzzle of a rifle with a speed of 642 m/s. (note: assume the acceleration in this is constant) what is the acceleration of the bullet while in the barrel? answer is m/s^2 Homework Equations uhm i...

Can someone else me please I am so stuck on these questions! I am stuck on both these questions, I have no idea where to begin I was given a worksheet which our instructor will review with us but I would like to know how to do them before class. I finished most of it but this I am stuck on. Can...

Hi, i think I've got the first part of this question done but I am stuck with the rest, so i'll post the lot in case you think i have the first part wrong. a) Derive and expression for the work done by an ideal gas when it expands isothermally at temperature T from a volume V1 to V2. b)...

Homework Statement Hi, I am reading Ray d'Inverno's book, 'Introducing Einstein's Relativity' and there is a particular derivation of the geodesic equation that I get stumped on (chapter 7). It is a variational method and the final equation is df/dx_alpha-d/du{df/dx_alpha_dot}=0 where...

Homework Statement integral of (x^2)*sqrt(6x+7) from 0 to 1 The Attempt at a Solution i am thinking this has something to do with u substitution but i can't figure out what u should be?

Find the set of all solutions of the following differential equation dy/dx=3y I've gotten this far y'=3y y'/y=3 I feel like I'm forgetting a fundamental integration identity like, y=ln(y'/y) <-- Not sure that is even correct. I'm not sure. The book says the solution is...

A Few Tough Physics Problems! I'm stuck, Please Help! 1. Two canoeists in identical canoes exert the same effort paddling and hence maintain the same speed relative to the water. One paddles directly upstream (and moves upstream), whereas the other paddles directly downstream. With...

The draw i keep my kitchen implements in is stuck, i am sure it is the the spatula thing for picking up fried eggs as it has done it before, but this time i can not un wedge it as the draw will only move about 1/4 inch, i have tried shaking, wiggling, pulling, banging it but nothing works this...

Homework Statement http://img375.imageshack.us/my.php?image=70177175xx7.jpg The Attempt at a Solution Hey guys I'm new here and was wondering if i could get some help. I'm stuck on how to construct the matrix A. Any help would be really appreciated!

[b]1. The problem statement, all variables and given integral of : (nRT)/(V-nb)dV from Vi to Vf\int ^{Vf}_{Vi} [SIZE="4"](nRT)/(V-nb)dV I am really stuck on this one! Do you need to move the denominator up first?

Hey everybody, My professor started our PDE I class in Chapter six, so I am having a hard time with the really basic stuff to get the theory down. One of my questions to answer is to verify a solution by using direct substitution. u(x,t) \ = \ \frac{1}{2}\left[\phi(x+t) \ + \ \phi(x-t)...

Completely stuck with this: \int_0^\infty sin^{2008} x dx Any help on how to tackle this please?

A particle of mass 0.2kg hangs from and ideal spring. In equilibrium, the spring is stretched by amount of 0.49cm. The spring is then suspended from the ceiling of a lift and hangs motionless relative to the lift as the lift descends with a constant velocity of 2.0m/s. The lift then suddenly...

Homework Statement Hey guys. I'm in the middle of this crazy exercise and I got stuck in this ugly integral in the bottom of the page, any ideas on how to solve it? Homework Equations The Attempt at a Solution

two questions that i can't ever remember covering first of all finding a perpendicular vector find a vector perpendicular to the vectors a=i+2j-2k and b=-2i+3j+5k and secondly the equation of a plane?? through point with position vector (2,1,1) and perpendicular to (3,-1,2) what are the...

i have an exam in a few days and am certain a question like this is going to pop up but i have no solutions to this question and no idea how to work it out the question is as follows Find the equations of the line L1 through the point with position vector (4,2,1) and parallel to the vector...

Homework Statement Use trigonometric substitution to evaluate \int{\frac{x^2}{\sqrt{9-x^2}}}dx The Attempt at a Solution Let x=3\sin\theta then dx=3\cos\theta d\theta \int{\frac{x^2}{\sqrt{9-x^2}}}dx =\int{\frac{9\sin^2\theta}{3\sqrt{1-\sin^2\theta}}}\ 3\cos\theta \ d\theta...

Homework Statement Ok, so I need to solve this integral (bottom of the pic) using Stokes' theorem. What I did first is to find the Curl, then I used the UV surface as usual and then found the normal. After that, I switched to an area integral of the dot product between the curl and the...

The cost function for production of a commodity is given below. C(x) = 369 + 21x - 0.08x^2 + 0.0006x^3 Find the actual cost of producing the 101st item. (Round the answer to the nearest cent.) i know that c'(x) = 21-.16x+.0018x^2 but for the life of me cannot figure out how to find...

Homework Statement On a warm day 90F, the air in aballon occupies a volume of .25m3 and exerts a pressure of 20 lb/in2. If the baloon is cooled to 30F in a refrigerator, the pressure drops to 14.2lb/in2. What is the volume of the balloon Homework Equations...

Yet another problem I'm stuck on tonight... The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. Assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a...

I hate it when this happens: Okay, actually I love it when this happens. :smile: This actually happened to me and my teenage daughter several years ago. I couldn't help but yell for help. My daughter wasn't sure whether to die of embarrassment or die of laughter. I think it's worse...

http://img103.imageshack.us/img103/637/trigrb3.th.jpg I was having trouble with parts iii and iv. I have done i and ii. Please can someone help me with iii and iv. I do not really know where to start for iii and hence iv. I was thinking about the double angle formula for tan, but didnt...

Im trying to teach myself some geometry on my own, but I am stuck since some weeks, with a couple of area problems of triangles. I ll really appreciate any help or advice about it. The formulas for a triangle are: A=1/2 bh and A=1/2 ab Sen C The problem says: -Find the area of a...

Hello everybody.. my name is Rohan Prabhu and I am tanked. The results of the various entrance exams to colleges that i gave have started coming in.. and i have tanked like hell in all of them. Now there are two options in front of me: Either take whatever college I get.. whatever degree I get...

Im Stuck! I have a final exam coming up in my engineering calc class. I am at a loss for how to complete some of the 238570198437049870958273049875 problems he gave us for a review. I thought I did well on the exam covering the material but i got a 63. Apparently I am not understanding...

Homework Statement http://www.physics.oregonstate.edu/~mcintyre/COURSES/ph429_S06/hw1.pdf See question 3. I am really stuck trying to answer part c. I looked over the solutions to parts a and b and I really just cannot figure out what is going on. This is very weird. Homework Equations...

What would be required to cause photons to orbit an object?

Hi all. I'm enrolled in AP Calculus AB at my school. However, for months I have been learning calculus on my own. First and foremost I simply enjoy math, but an added bonus was that I would be able to take (and pass) the more advanced Calculus BC test instead of the AB test at the end of the...

Hi everyone ! I got the weird idea of revisiting my old math books from 20 years ago and I got stuck on an problem that is probably super easy for most of you. It's from the chapter where we learn about how to solve limits of the form 0^0, \infty^0, 1^\infty by transforming an...

Homework Statement let x + y = u and y = uv Expand dx and dy in terms of du and dv Homework Equations The Attempt at a Solution i got this answer: dy = udv + vdu and dx = du - udv - vdu is this correct?

So I got rejected from both programs I had lined up and applied to. I have a few options, but was really hoping you guys would have many more. I could take two classes online from ArtOfProblemSolving.com, they would help me prepare for math olympiads and contests, and I would certainly enjoy...

Homework Statement FInd the volume of the solid that lies within the sphere x^2 + y^2 + z^2 = 1, above the xy plane, and outside the cone z = 3 \sqrt{x^2+y^2} Homework Equations The Attempt at a Solution i tried to use rdzdrd(theta) to integrate this question but i can't get it...

I'm stuck on this problem. A sledge of mass 120 kg is at rest on a horizontal icy surface. A man of mass 70 kg stands at one end of the sledge so the initially the distance from the man to the shore is 20 m. The man now walks 3 m relative to the sledge, towards the shore. The he stops...

Use binomial series to approximate sqrt (35) with an accuracy of 10^(-7) (35) = sqrt(35*36/36) = 6*sqrt(35/36) Formula: (1+x)^n where x=(-1/36) and n=(1/2): 6*sqrt(35/36) = 6[(1 + (- 1/36))^(1/2)] = The coefficients of the binomial series are: '1/2 choose 0' is 1. '1/2 choose 1' is...

[SOLVED] just a problem that I'm stuck on.. Homework Statement A car travels around a curve with a radius 55.0 m at a speed of 20.0 m/s. At what angle must the curve be banked so that the car does not have to rely on friction to remain on the road?Homework Equations tan[theta] = FC/FG...

Simple Microscope Problem that I have been STUCK on! Homework Statement How far from a lens of focal length 50 mm must the object be placed if it is to form a virtual image magnified in size by a factor of 3? Homework Equations The Attempt at a Solution I thought I could us the...

Use binomial series to approximate sqrt (35) with an accuracy of 10^(-7) (35) = sqrt(35*36/36) = 6*sqrt(35/36) Formula: (1+x)^n where x=(-1/36) and n=(1/2): 6*sqrt(35/36) = 6[(1 + (- 1/36))^(1/2)] = from k=0 to k=4: = 6[(1 - (1/2)*(1/36) + (1/8)*(1/36)^2 - (1/16)*(1/36)^3 +...

Hi. i'm an undergrad, and a beginner in maths. i don't really know how other people study math ( i really don't since i haven't really asked anyone ), but typically when you see a new theorem, you try to prove it, right? now, I'm not talking about being able to correctly write down the proof...