Stuck Definition and 836 Threads

Just a few questions from a review packet I'm stuck on, any help would be appreciated! 1) The moment of inertia about its axis is given as .5 mr^2. If this cylinder rolls without slipping the ratio of it's rotational kinetic energy to it's translational kinetic energy is a. 2:1 b. 1:1 c. 1:2...

Pretty much worked out, but stuck! Gauss' Law problem Homework Statement "Consider a charge density distribution in space given by \rho = \rho_0 e^{-r/a}, where \rho_0 and a are constants. Using Gauss' Law, derive an expression for the electric field as a function of radial distance, r...

Homework Statement verify that y_1(t) = t is solution of t^2y'' - t (t+2)y' + (t+2)y = 0 use "reduction of order to find 2nd linerary independent solution of equation Homework Equations I am stuck on the first part. Confused as to how (which method) I am expected to use to verify...

Homework Statement A sker reaches a speed of 56 m/s on a 30 degree ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest? Homework Equations Which equation do i start with? I'm pretty sure i have to find the...

Homework Statement Hi. For a project I have to derive this formula for bright fringes in optics, but I'm stuck on this simple math part (or maybe its not so simple)...ive attached a picture of where i don't understand...it might be considered a simple math problem so I'm sorry if this is too...

stuck on separable equation (algebra prob??) Homework Statement y' = 2x/(1+2y) y(2) = 0 (1+2y)dy = 2xdx integrate both sides y + y^2 = x^2 + c I am stuck trying to put in in explicit form, so y = ... is this completing the square or something? Homework Equations The...

stuck with a problem...on linear thermal expansion of solids Homework Statement I just read a problem 2day...it's on linear thermal expansion of soild...can anyone guide me through...it says..." A sqaure ABCD is made with two different metals...the coefficient of thermal expansion of the...

The position of a particle moving in the xy-plane is given by the parametric equations x = t3 - 3t2 and y = 2t3 - 3t2 - 12t. For what values of t is the particle at rest? So we're trying to find when the slope (dy/dx) is equal to 0. dy = 6t2 - 6t - 12 dx = 3t2 - 3t dy/dx = (6t2 - 6t -...

Hi, If we'll build a chimney from 2 walls with a decreasing width (meaning, the length between the walls gets smaller as we go down the chimney, since the walls both have a small slope), and then throw a ball down that chimney, it would get stuck. I am having hard time computing the forces...

Homework Statement Simplify this expression. sin(2* arcsin(x/3)) Homework Equations The Attempt at a Solution Let t = arcsin(x/3), we get sin(2t) which is double angle sin(2T) = 2 sinT cosT I did cosT first T = arcsin x/3, and we know inverse of arcsin is sin T = x/3 this gives us the...

Like i said above in the title, i can't choose from two careers, which are almost opposite from each other, quantum physics, and zoology. In my early years i enjoyed zoology and animals, but as i got older i shifted into quantum physics, i enjoy both very much, I'm not concerned about money. I...

Please Help ...... Urgent Hello ppl I stuck with a differential equation and all I need is your kind help. While solving a problem I got one eqaution as given below ((Ax+B)^4)y''''+ ((Ax+B)^2)y''+(i/const.)y=0 here A, B, and const are constants i denotes complex no (iota). I...

Hey, Can anyone help me with my imaginary experiment? In a large glass tank I place air-filled balls of thin rubber (like a balloon but perfectly spherical). I fill the tank to the top with the rubber balls, seal the lid and evacuate the tank of air. The internal pressure difference...

A few weeks ago, I decided to challenge myself, and design a wooden pendulum clock. It's been loads of fun, especially the hard parts. One such hard part prompted me to make this thread. Here is the problem: Like any regular clock, The hour, minute and second hands are on the same axis...

Homework Statement Evaluate the limit: lim_{(x)\rightarrow(2)}\frac{x^2+x-6}{sqrt(x+4)-sqrt(6)} Homework Equations N/A The Attempt at a Solution I've drawn the graph which indicates that the at x=2, y=0, so 0 would seem to be the limit. I could not, however, get the limit...

Need Help, Stuck on Calc 1 Homework! 1. Find constants A, B, and C such that the function y = Ax^2 + Bx + C satisfies the equation y'' + y' - 2y = x^2 2. Find \lim_{x \rightarrow 0} \frac{sin(a + 2x)-2sin(a + x)+sin a}{x^2} 3. If y = \frac{x}{\sqrt{a^2-1}} - \frac{2}{\sqrt{a^2-1}}...

Deflection in a CRT, Potential Problem: Problem more than halfway solved, stuck Homework Statement In Fig. 24-32 an electron is projected along the axis midway between the deflection plates of a cathode-ray tube with an initial speed of 6.40 106 m/s. The uniform electric field between the...

Homework Statement The problem is to either find the limit or show that it does not exist lim_{(x,y)\rightarrow(2,-2)}\frac{4-xy}{4+xy} I've been able to do similar problems to this such as lim_{(x,y)\rightarrow(0,0)}\frac{xy}{x^2+y^2} where I took two different paths to the limit and...

Out of boredom* I derived some simplified equations to describe the dynamics of a pneumatic gun. These equations are extremely simplified, but they should provide some insight into the system that my numerical models can't. This system had one non-linear equation that could be rewritten as the...

I'm reviewing for a D.E. quiz, and I came across this problem. Solve the IVP y'=1+x+y+xy, y(0)=0 I feel as if it's terribly simple and my brain is simply not clicking. Any help would be appreciated.

Homework Statement Determine the height h above the base B at which the resultant of the three forces acts. Homework Equations Rx=F1,x + F2,x + F3,x The Attempt at a Solution Rx=(-300)+650+(-250) Rx=100 but where?! The picture shows the diameter decreasing a tad just under the 650 force...

Exponential Equation! -Stuck!- 1. 32y+3 = 3y+5 The Attempt at a Solution 2y + 3 = y+5 2y = y+2 I really don't think I am doing this right, I am trying to find the value of Y. the answer is 2 but I don't know how to come up with the answer.

Hello. I signed up to get peoples opinion. See, I have no one to talk to about my situation or quantum physics, so here it goes. I am 23 and have no school experience. I am a natural at computers, but my real passion of course is quantum physics. When I learned about quantum my whole entire life...

\int\frac{ln(x+1)}{x^{2}+1} The limits of integration are from 0 to 1. I've tried all the ways I've learned how to approach an integral so far and am stuck. (tried u-sub and by parts.) If anyone could throw me a bone that'd be great. Thanks!

logarithms STUCK! 8logx-3logx^2 = log8x - log4x im struggling to find x. my working out so far is: rhs log8x-log4x = log2 = 8logx - 3logx^2 = log 2 = 8logx - 3logx^2 - log 2 = 0 = -b+ or - the square root of b^2-4ac divided by 2a a = -3 b = 8 c = - 2 = -8 + or - sqaure...

what do i do to p and c to get z when z=pc please help i know its prob dumb but i am so stuck.

z = pc what do i need to do with p and c figures in order to get z this is prob really dumb but I am so stuck please help.

Problem Calculating a limit with a square root, I'm stuck :( Homework Statement The limit is equation 9-t / 3-sqrt(t) as t approaches 9 I'm stuck on the how to simplify this? Thanks for any help. Homework Equations The Attempt at a Solution

Homework Statement I figured out the speed of the runner at t=2.0 seconds, but I am stuck on finding v of the runner at the end of the race. Q: At the starting gun, a runner accelerates at 1.7 m/s^2 for 4.8 seconds. The runner's acceleration is zero for the rest of the race. what is the...

I am using scripting my webpage's tabs I have 5 tabs and I'd like the tab animation I am learning to make a selected tab to be... a selected tab. I'd like this to be done in css I'd like the mouse pointer not to be changed into a hand when the mouse is over the selected tab. That's it I mean...

1. aRb on Z if 5|2a+3b 2. Since 5|2a+3b, 2a+3b=5m, so 2a=5m-3b. 3. Consider 3a+2b=2a+2b+a=5m-3b+2b+a=5m-b+a. I can't show that 5 divides that, but there is another way to wrangle that into a better form. I need help seeing how that works. Thanks.

im stuck on this proof can anyone help? Is it true that for all natural numbers n, for each natural number x, x^n − x is divisible by n? If so, prove it; if not, explain why not. so far i have gotten: make x=1, ((1)^n) -1 = 0, therefore x=1 is divisible by n assume true for x=k...

First of all, HI! This is my first post and my first day in this forum. =) I am having quite a problem demystifying this function. It's on a book I have and it clearly states that it isn't periodical. I can't reach that conclusion and was hoping you could help me out. So, the function in...

Hello - I've been stuck on this for a while now and I really need some help. Homework Statement Find the equations for all lines that are tangent to the circle x^2+y^2=2y and pass through the point (0,4).Homework Equations y=mx+b ax^2+bx+c=0The Attempt at a Solution From the given equation of...

Homework Statement A 1.9-kg block slides down a curved, frictionless ramp. The top of the ramp is 1.5m above the ground; the bottom of the ramp is 0.25m above the ground. The block leaves the ramp moving horizontally, and lands distance D away. A) What is distance D away? B) Suppose the...

Hi. I would appreciate if anybody could help me with the following: 1. a)Solve 3cosec x-5sin x = 2 for 0<x<360degrees b) Prove that cosecx - sinx = cosx cotx 2 a) f(x) is x + ln(3x-4). Show how to convert f(x) into the iterative formula b) If x0=1, write values of x1, x2, 3 until a...

Homework Statement I was messing around with various integral problems for a test a few months before, and I got stuck on a problem I made up: http://alt2.artofproblemsolving.com/Forum/latexrender/pictures/e/f/2/ef2e9abca8945a10d5df45e7b73755ecb34cf21d.gif Homework Equations No idea. I used...

Homework Statement The problem gives a graph of Emf versus time, in a circuit consisting of capacitor C and voltage source e. It asks to draw the time dependence of the current I in the circuit. Homework Equations The graph looks like a trapezoid, positive slope starting at Emf=0 t=0...

First of all, how do you know if a combustion process produce h2o(g) or h2o(l)? It depends on the temperature, but how do you figure that out? I found the heat released during the combustion processes, which should equate the work done by the system (theoretically). But according to w =...

Attached is a question from my book, I know that the answer is 112KN but can't work out the method for getting there. Hope you can help, James

Homework Statement I have a sway case beam as in the image below, but do not know the equation for the pinned joints. We were told Moment (AB) = 6EI(delta)/Lsquared for fixed ends such as AB and BA but not told the moment equation for CF for example. I am assuming FC = 0 due to no moment at...

Stuck on some Physics, help please! (Work and Energy)? K this first one I am not sure how to do it.. i did the second part, that's because i had all the variables but in this one i dont... ok this is about skeleton racers... the track total height is 104m, in the absence of nonconservative...

E=Q(4th root of 2, i) and G is the galios group of E over Q I found the minimal polynomial p(x) of 4th root of 2 over Q and Q(i) to be x^4-2 I'm trying to show (1) the galios group H of E over Q(i) is a normal subgroup of G (2) If K is the galios group of Q(i) over Q show that it is...

Homework Statement An unstable high-energy particle is created in the laboratory, and it moves at a speed of 0.978c. Relative to a stationary reference frame fixed to the laboratory, the particle travels a distance of 1.38x10-3 m before disintegrating. (a) What is the proper distance...

Energy (Potential, kinetic...) So stuck :( Homework Statement Two objects, m1 = 5.50 kg and m2 = 3.00 kg, are connected by a light string passing over a light frictionless pulley as shown in the figure below. The object of mass 5.50 kg is released from rest, h = 4.50 m above the ground. (a)...

Homework Statement dx(1)/dt=-0.1x(1)-x(2) dx(2)/dt=x(1)-0.1x(2) x1|t=0 = 1 , x2|t=0 =0 First we had to define the magnitude (q) of the velocity vector at t = 10. The follow up question is: The horizontal component x1|t=0 of the starting position is not known very accurately...

Homework Statement A train is 120m long. Gaurav was standing 200m from the front of the train when it began to accelerate uniformly from rest. He noticed that the front of the train was moving at 8.00m/s when it passed him. How fast would the back of the train be going when it passed Gaurav...

Plz , Help me ... I have a project in the college ... I'm an IT student ... I'm really tired of searching in the Net and books ... and yet I can find anything ... I need to find physics for the motion of the pinball ... I need Equations which i can explain and understand ... please help me...

Homework Statement A cannon is arrange to fire projectiles, with initial speed V0, directly up the face of a hill of elevation angle alpha. At what angle from the horizontal should the cannon be aimed to obtain the maximum possible range R up the face of the hill? Homework Equations...

A 10.00 mL solution of 0.2500 M CH3COONa is titrated with 0.1300 M HCl to the equivalence point. CH3COO− + H+ → CH3COOH volume of HCl required=19.23 mL Calculate the pH of the solution at the equivalence point. I've tried this a million ways and still keep getting it wrong. Also, my...