Stuck Definition and 836 Threads

I have to find the laplace inverse of a function y(s) which has repeated complex roots. Y(s)=s^2 / (s^2+4)^2 so s=2i, s=2i, s=-2i, s=-2i. My partial fraction is as follows: A/(s-2i) + B/(s-2i)^2 + C/(s+2j) + D/(s+2j)^2 I use the standard method for finding regular repeated roots but...

"Stuck" in REM sleep? Is it possible to get "stuck" in REM sleep? Meaning, since we go through different phases of sleep, could we get stuck in the REM phase and not be able to wake up because of some weird phenomenon of phenomena?

In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.050 s, during which time it experiences an acceleration of 340 m/s2. The ball is launched at an angle of 47° above the ground. Determine the horizontal and vertical components of the...

The problem: A force is applied to the end of a 2ft. long, uniform board weighing 50 lbs, in order to keep it horizontal and stationary while it pushes against a wall at the left. If the angle the force makes is 30 degrees facing the wall, the magnitude of the applied force is? (hint: the...

Hi all, I'm in my first year of university physics (mechanics and waves) and am stuck on an assignment question. The question itself is not complicated, but I feel as though I'm skipping over something important. The question is: A 3.8 kg block is pressed against a vertical wall by a force...

Hello everyone, I'm stuck on trying to prove the cross product rule for derivatives. I Have to add the right terms and its suppose to be easy but that's what i can't figure out! any help would be great! here is what I have: http://img135.imageshack.us/img135/5540/opopo3ej.jpg

Hello everyone I'm stuck on this problem its an integral but i don't know how to integrate the log_2 part, i converted it to natural log: Here is what I have: http://img278.imageshack.us/img278/1158/integral9lo.jpg Thanks.

I really love what I do, but right now I'm stuck in one of the worst modes that goes with the turf: 16 hrs+ a day, seven days a week, and no immediate end in sight. I'm getting too old for this. :cry: :cry: :cry:

I just can't solve this: I(\gamma)=\int_{-\infty}^{\infty} e^{-\sqrt{x^2+\gamma^2}}dx I have tried a trigonometric substitution x=\gamma \tan(\theta) but I am not happy with the result . Anyone got a hint?

I'm going through the review section of the Stewart Calculus text and I'm stuck on this problem. Given f_0(x) = x^2 and f_0(f_n(x)) = f_{n+1}(x) , n = 0,1,2... how do you solve for f_n(x)

Hello everyone, I'm designing a IC that will result in a 1 output if the number is > 9. So I wrote out the truth table and or'ed all the min terms and got the following: http://img282.imageshack.us/img282/482/lastscan45vd.jpg I'm stuck now! any help would be great!

I have several vector problems that I really need help with and I have a test on Monday. I am really screw. 1) By throwing a ball at an angle of 45 degree, a girl can throw it a maximum horizontal distance of R= 33 m on a level field. How high can she throw the same ball vertically upward...

A car with a load equal to 1/4 the total mass of the empty car has its center of gravity halfway between the front and rear axles. The drive wheels (rear) start slipping when the car is driven up a 20 degree incline. How far back must the load be shifted for the car to get up a 25 degree slope...

Hey everyone, I am stuck on this question: (2^1)(2^2)(2^3)(2^4)...(2^n) = 210 What is the value of n? I'd love to post what I have so far, except that the problem doesn't involve much work, so as soon as I have the first step I'll have the last...and I haven't yet gotten the first...

Trying to solve for x here... (e^10-11)^-1*(-e^(10-x)-e^10-x) = p So I try: (-e^(10-x)-e^10-x) = (e^10-11)p e^(10-x) = -(e^10-11)p-e^10-x ln(e^(10-x)) = ln(-(e^10-11)p-e^10-x) 10-x = ln(-(e^10-11)p-e^10-x) I get stuck there and don't know what to do. Any help appreciated.

9. A rocket is launched at an angle of 53.0degrees above the horizontal with an initial speed of 100m/s. It moves for 3.00s along its initial line of motion with an acceleration of 30.0 m/s^2. At this time its engines fail and the rocket proceeds to move as a projectile. A. What is the maximum...

Hello everyone. I'm so close to getting this problem done but i can't get the last part right! THe problem is the following: Two long, charged, thin-walled, concentric cylinders have radii of 3.0 and 6.0 cm. The charge per unit length is 4.9 10- 6 C/m on the inner shell and -8.5 10-6 C/m...

Why do people get songs "stuck" in their heads? Why do we get songs "stuck" in our heads?

I have been working on this problem for 2 days and can't seem to figure it out.. A 1500hp pump throws a jet of water 125 m into the air. (a) With what speed does the water leave the mouth of the fountain. (b) If the overall efficiency is 60%, how many liters of water per minute are thrown...

Hi, I'm thinking of applying for a summer scholarship (in dec) from our maths department where we undergo study for 8 weeks with a project in maths. We have to have our proposed topics in by 7/Sept but I'm really stuck for ideas. I'm a freshman at my university, and have taken/taking: the...

I got a question below: A force F = (2x i + 6y j) N acts on an object as it moves in the x direction from the origin to x = 5 m. Find the work W = Fdr done on the object by the force. I felt that the answer shld be 2x * 5 = 10 but it's too simple to be true is it? One more question...

I've been stuck on this relatively simple question for over an hour, can't get the right answer. I think my fundamental understanding of the units involved is flawed, I would really appreciate any kind of clarification as to what I'm doing... okay here goes. I'm given that three charges are at...

In the problem y` (cosh^2)x - (sin^2)y = 0, y(0)=pi/2 i'm also stuck on the integration step... my first step is dy/((sin^2)y)=dx/(cosh^2)x however, i don't how to integrate the right side~

In the problem, y`= 1+0.01y^2 the first i took was dy/(1+0.01y^2)=dx however, I'm stuck on the integration step... can someone help?

I have been stuck at this qns for 2 hours. A gymnast often toss a hoop forward while giving it a backward spin. the hoop has a radius R and mass M, and is thrown forward with speed V. Find the minimum backward angular velocity w the gymnast must give in order to make sure it spin back...

i'm trying to solve an equation, but I'm stuck on this step: (integral sign) e^2x*e^x(3sin2x+2cos2x)dx =?

can't get this! Hi there, I have a question that I cannot solve. Here it is. \frac{1}{\sqrt(4-2\sqrt3)}=x+y\sqrt3 then what is x^2+y^2? All I did was finding what left hand side stood for. It equals \frac{\sqrt3 + 1}{2} Any help?

These problems are from Giancoli 5th edition (principles with applications) A cubic box of volume 0.039 m^3 is filled with air at atmospheric pressure at 20 celsius. The box is closed and heated to 180 celsius. What is the net force on each side of the box? I first used the ideal gas law...

I have this system of DEs, but after getting through all the simplifications I can't factor the auxiliary equation: x1' = -2x1 + x2 + x3 x2' = x1 - x2 + 3x3 x3' = -x2 - 3x3 Then I eliminated all variables except for x2, using Differentiation operator. my AE from x2 is this: r3 + 6r2...

Stuck on two electric field questions... Hi guys, I have these two questions which I am unable to answer. This is the first one: Calculate the magnitude of the electric field at one corner of a square 1.26 m on a side if the other three corners are occupied by 2.80×10-6 C charges ...

Hello I’m currently working on a nuclear engineering major with a minor in business administration. I absolutely love what I am learning about. There is nothing more I'd rather be doing; I’ve been passionate about nuclear energy from a young age. That being said, I’m a little stressed about...

Ok I'm stuck on this problem - and it didnt particularly look hard when I started doing it, oh say about a good 2 hours ago.. hmm Solve the IVP 2y'' + 3y' + y = t^2 + 85 sin(2t), y(0) = -2, y'(0) = 0. My homogeneous solution is c1y1 + c2y2 y1 = e^\frac{-t}{2}, y2 = e^-^t, Wronskian =...

can anyone help me with the proofs: 1+\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+\ldots=\frac{\pi^2}{6} if F_i is the ith Fibonacci number, then F_1+F_2+F_3+\ldots+F_n=F_{n+2}-1 F_2+F_4+F_6+\ldots+F_{2n}=F_{2n+1}-1 F_1+F_3+F_5+\ldots+F_{2n-1}=F_{2n}...

Hello everyone, I'm having problems finding The resultant intensity at point b, i know its the vector sum of E1 and E2. q1 = -6x10^-9; q2 = 6x10^9 they are 12cm apaprt. Determine the electrict field at A and B, i already figured out A. This is the free body diagram. ^ E2 ..\ ...\...

I'm at work, with no reference materials whatsoever. any suggestions / help would be appreciated.

I am trying to prove that 3 divides n^3~-7n+3 for all integers n greater than or equal to 0. I have gotten to this point: 3|(k~+~1)^3~-~7(k~+~1)~+~3 Where I try to show that is true for k+1. I have been scribbling on scrap paper trying to figure it out. I've expanded the expression...

A mass, m1 = 9.23 kg, is in equilibrium while connected to a light spring of constant k = 106 N/m that is fastened to a wall.A second mass, m2 = 6.42 kg, is slowly pushed up against mass m1, compressing the spring by the amount A = 0.169 mThe system is then released, and both masses start moving...

My question is: Let V = \mathbb{R}_1 [x] be the vector space of polynomials in x of degree at most 1. For f(x) \, , \, g(x) \in \mathbb{R}_1 [x], define: <f(x) \, , \, g(x)> \, = \int_0^1 x^2 f(x) g(x) dx Show that this defines an inner product on \mathbb{R}_1[x]. (You may assume...

The question I'm working on is "use the appropriate Trigonometric substitution to evaluate the following integral: \int \frac{x^2}{(4x^2-49)^\frac{3}{2}}dx " Now the first thing i did was make it so that it had a root in it by making it \int \frac{x^2}{(4x^2-49)(4x^2-49)^\frac{1}{2}}dx this...

I am stuck on some homework - I see many options, but not which is the correct set. A simple 2D shear velocity field: v (x-direction) = v (x-dir)(y,t), v (y-dir) = 0, a barotropic flow with uniform density. Does this flow involve expansion, contraction, rotation and or deformation? How does...

One of my biggest griefs is the fact that I'm a complete n00b when it comes to maths. I'm supposed to find the second derivate of f(x) = \frac{2-3x}{x^2} I started out with this: f'(x) = \frac{-3}{x^2} + \frac{2-3x}{2x} f''(x) = \frac{3}{2x} + \frac{2-3x}{2} But it didn't take...

Stuck on these... :confused: 1.Convert the following equation to Cartesian coordinates r sin (angle) = -2. 2.Convert the rectangular equation y = -5x + 4 to a polar equation. 3.An aircraft going from Atlanta, GA to New York, NY on a bearing of S69oE is traveling at a speed of 430 miles...

I'm stuck on this question... if someone could give me a hand that'd be great.. What is the minimum distance between the point (3,-2,4) and the line defined by x = 1 + t y = 4 - 3t z = -2 + 2t My approach was to find a point on the line by letting t = 1 I got (2, 1, 0) then I...

So in order to get my AS in physics (so I can transfer to a 4-year school) I need only 3 physics classes, and some other base requirements. So my plan was to get a physics AS and either an AS in Computer Science or Engineering (because the base requirements for both of those happen to be the...

The Question Reads: Discuss the propertoes of an alternating electromotive force with an angular frequency of 200 radians per seconf applied across to large circular plates of radius 0.10 m separated by a distance of 0.01m. Describe the electric field E(t) between the plates assuming no charges...

Im going through odd number related rate problems in preparation for an exam tmmrw. The correct answer is \frac{10}{\sqrt{133}}. There is something wrong with the relation I construct; first the problem: The diagram they give is similar to an isocelles triangle with PQ running 12 ft down the...

A metal object is suspended from a spring scale. The scale reads 860 N when the object is suspended in air, and 785 N when the object is completely submerged in water. The acceleration due to gravity is 9.8 m/s^2. Find the volume of the object. Answer in m^3.

The following is an old article from 1986: http://www.frc.ri.cmu.edu/~hpm/project.archive/general.articles/1986/dense.ltx I've been told that Supersymmetry theory has changed a bit since the article was written. Under the new theory + - higgsinos are stuck together and they in turn are part...

Impulse and momentum... really stuck... please help! Consider a collision between two spheres where we have both elastic force and dissipative force. Let x is a variable where it is let to be the sum of their radii when they are just touching, and that distance decreasing during the...

Hi Again, I am doing a question on related rates that I have become stuck on. The height (h) of an equilateral triangle is increasing at a rate of 3cm/min. How fast is the area changing when h is 5cm? I know that the area of a triangle is bh/2, but after that I am stuck :redface: I...