Stuck Definition and 836 Threads

I have done up some of the steps. I got stuck and not sure how to continue. I am not sure if those steps are correct. Need help on that.

I just got a taught Master offer in Physics (part-time mode for 2 years) and I don't know what to do... First of all, I have a BSc in Applied Physics which I graduated in 2011. I study Physics because it is interesting. I felt happy when I got to understand something new (about the universe)...

I'm a millennial that's truly stuck in my parent's basement. I've heard from multiple Uber and Lyft drivers that more and more college graduates are also moving back home because they're starting to run out of money from (half) independence (because they're stuck in student loan college debt)...

Can 2 bar magnets be stuck together to create a magnetic field about twice as strong?

Hi everyone! Please, I'm trying to understand the Schrodinger equation, and I've understood it this far, which which is a miracle, hehehe: (Laplacian)(psi) plus ((2phi)/h)^2.2m (E-V)(psi) I know that hbar = h/(2phi) But how that turns into (Laplacian)(psi)+2m/(hbar)^2.(E-V)(psi) My math...

Homework Statement I have a circuit that I am to analyse and find I. I am told to use an excel matrix sheet given to me to solve 3 unknowns. I have 4 loops so this is a problem. I have made an attempt using three loops and referred to a previous thread on here for some help. It says I can do...

Homework Statement Trying to help a friend with a problem. We are supposed to solve the below using polar coordinates. The actual answer is supposed to be π/16. Solving the integral is not the issue, just converting it. 2. The attempt at a solution What I got sort of worked, but it is only...

Homework Statement What mass of methane must be combusted with excess oxygen to generate enough heat to warm 675 g of water by 25.0 C? (assume no heat lost to surroundings)Homework Equations Specific heat of H20= 4.184 J/g*C q = mCT balanced equation: CH4 + 2O2 -> CO2 + 2H2O The Attempt at a...

Homework Statement \int\frac{x^2}{\sqrt{x^2+4}}dx Homework Equations n/a The Attempt at a Solution Letting x=2tan\theta and dx=2sec^2\theta d\theta \int\frac{x^2}{\sqrt{x^2+4}}dx=\int\frac{4tan^2\theta}{\sqrt{4+4tan^2\theta}}2sec^2\theta d\theta=\int\frac{8tan^2\theta...

Using Physics to get out of a hole: https://www.wired.com/story/how-to-hoist-yourself-out-of-a-hole-with-physics/ Remember folks: Don’t try this at home as you may be late for dinner.

Homework Statement Change the subject of the equation to (g) Homework Equations T = 2π√l/g x^2 The Attempt at a Solution In my attempt I've divided both sides by 2π for T/2π = √l/g x^2 Then I decided to square both sides for (T/2π)^2 = l/g x^2 Now I'm really not sure if what I've done...

$\frac{1 -\cos A}{1 + \cos A} = (\cot A - \csc A)^2$

Homework Statement Hi, So I had a pretty long question solving a Linear ODE but now I've gotten stuck at this stage where I can't seem to get it into the right form to carry out partial fraction expansion Homework EquationsThe Attempt at a Solution [/B] I'm quite sure that I what I have at...

hello! So i have been working in manufacturing (aseptic processing) big pharma for more than a year now. I have a biology degree. I am 26 to 27 next month. I do not like it at all, since I feel like I am in some ways at the bottom of the food chain. Least payed, little advancement and...

Hi, My teacher tasked me with a complex waveform question, i have looked for some time to find out how to tackle these, but i still do not know where to begin. Any help would be greatly appreciated, not look for an answer just a method. $$i=12sin(40*\pi t) + 4sin(120* \pi t - /3\pi) + 2sin(200...

Homework Statement (a) Consider a cylindrical can of gas with radius R and height H rotating about its longitudinal axis. The rotation causes the density of the gas, η, to obey the differential equation dη(ρ)/dp = κ ω2 ρ η(ρ) where ρ is the distance from the longitudinal axis, the constant κ...

Homework Statement A charge of Q = −1 µC is moved from point A to point B. Which of the following situations will result in an increase in electrical potential energy? I've now uploaded the files below Homework Equations F = qE U = qV a b c d e f g h The Attempt at a Solution I think...

Homework Statement A projectile is fired vertically from the Earth's surface with an initial speed of 11.4 km/s. Neglecting air drag, how far (in meters) above the surface of the Earth will it go? Homework Equations (1/2)mv^2 -GmM/R The Attempt at a Solution KEi+PEi = KEf+PEf (1/2)mv^2 -...

I have figured out the triangle's height and base, but I need to figure out sides a and b. I have tried Pythagorean theorem and similar triangle ratios, but it is not working out. Please help. See picture below. Thank you.

Homework Statement [ Homework Equations I found this is about linear quadrupole and these are potential of it. [/B] The Attempt at a Solution So, i solve the problem (a) by using potential. This is what I've done, I'm not sure if it is right though.[/B] And i have no idea how can i...

Homework Statement Refer to attached image. Please help. It's due tomorrow. Homework Equations Doesn't state The Attempt at a Solution Refer to attached image

I really love physics, and have been thinking about majoring in it for a while, but due to the fact that I think I'd rather just work after getting my degree instead of pursuing a PhD, I have been following the engineering path. I am currently a second year ME student, and I am just now...

I am really enthusiastic about physics and always dreamt of becoming a physicist but unfortunately my parent's don't really agree :( and that they are instead telling me to get into mechatronics engineering which is good since I do have a love for robotics and automation but compared to natural...

Homework Statement If ##a^2 = a## for all ##a \in R##, then ##R## is commutative. Homework EquationsThe Attempt at a Solution I have been working on this problem for a few hours without any success; I literally have nothing but a's and b's scrawled over a bunch of papers. I could use a hint.

Homework Statement Let ##a,b,c## be positive integers and consider all the quadratic equations of the form ##ax^2-bx+c=0## which have two distinct real roots in ##(0,1)##. Find the least positive integers ##a## and ##b## for which such a quadratic equation exist. Homework EquationsThe Attempt...

Sorry this is the first time i come to this forum. Why the -Ldi/dt in the left side is minus but not plus sign i got confused Does everyone can help me in this problem thank you ------------------------------------------------------------- i know V-Ri-Ldi/dt=0 is true in the right hand...

Homework Statement I am trying to solve for x in this equation: Homework EquationsThe Attempt at a Solution I tried solving it like a quadratic equation. This is the most simplified I could get it. Can someone please help me find a simpler expression

Homework Statement Consider the following matrix. A = 2 + 4i...1 + 5i 2 − 3i...2 + 3i Let B = A-1. Find b12 (i.e., find the entry in row 1, column 2 of A−1) Homework Equations A-1 = 1/(ad - cb)* [ d -b ] [ -c a ] <--imagine as 2x2 matrix with first row (d,-b) and second row...

Homework Statement Express the complex number (−3 +4i)3 in the form a + bi Homework Equations z = r(cos(θ) + isin(θ)) The Attempt at a Solution z = -3 + 4i z3 = r3(cos(3θ) + isin(3θ)) r = sqrt ((-3)2 + 42) = 5 θ = arcsin(4/5) = 0.9273 ∴ z3 = 53(cos(3⋅0.9273) + isin(3⋅0.9273)) a = -117 b...

Homework Statement In a certain inertial frame two light pulses are emitted a distance 5 km apart and separated by 5 µs. As observed from another frame, which is traveling parallel to the line joining the points where the pulses are emitted at a velocity v with respect to this frame, the pulses...

Dear friends, I'm unable to solve the following probability question. Please help me solve it. Thanks in advance. The answer given in the book is: 5/9 [for part (b)]. Don't know even if the answer is correct. Suzi has taken up golf, and she buys a golf bag containing five different clubs...

I am trying to understand space vectors in 3 phase machines. If you have a balanced 3 phase system, the 3 phasors of voltage, current or whatever... should sum to 0. i<0 + i<-120 + i<-240 = 0. But in this image of a rotating space vector ...

Homework Statement Uxx - SU = A ; 0<x<1 Boundary conditions : Ux(0) = 0 U(1) = 0 The Attempt at a Solution I tried to set a new variable W = u + A, I can get rid of the A in the main equation and U(1) becomes = 1. If I set U= C*esqrt(S)x into the equation, its a trivial solution because of...

Hello Need some help simplifying this. In relation to a driven oscillator I am looking for wmax for which the amplitude is maximum. I understand the theory and I am just missing something with the maths and I know its probably something so stooooopid I am missing >< I'm taking the derivative...

Hi. Right now I'm working on Morris Kline's Calculus: An Intuitive and Physical Approach after having finished Saxon's Advanced Mathematics (precaclulus book). I came in feeling strong and now honestly I just feel very frustrated. I can do something like 60-70% of the problems but there seems...

Hey guys and girls, We have all stumbled upon some problems/tasks where We would have no idea how to proceed. (I am not talking about calculation errors). What works best for you in these situations? I usually go do something completely else. Activating Other parts of the brain may give you...

Homework Statement I have a linear integral (e^xsiny-2)dx + (e^xcosy+x^2)dy y≥0 2x=x^2+y^2 I used Green's theorem and got: ∬ (e^xcosy+2x) - (e^xcosy) dy dx x bounds: from 0 to 2 y bounds: from 0 to sqrt(2x-x^2) After solving all that stuff I get to: ∫ (2x) (sqrt(2x-x^2)) dx x bounds: 0 to...

Homework Statement I did some refresher exercises in khan academy. I tried to wrap my head around the factoring problems, but it did not go well... I did not understand the khan academy tips and hints. (about factoring) one particular difficult polynomial was thus: factorize the polynomial...

Homework Statement Hi, I've been trying to solve this exercise for the last four hours and I'm totally stuck. The problems goes like this: Given the mechanism in the image, located in the vertical plane, the OB cord is cut when t=0. Find the reactions Rx, Ry and N in {Kgf} for the instants...

I recently installed MCNP5 on rocks cluster running centOS 6.5, with mpich2-1.4.1p. While running simulations, MNCP5 is stuck in loop in 2 of the simulations. When I tried to perform one of the stuck simulations on windows with mpich-1.2.4, it didn't stuck. Can anyone guide me why MNCP5 is...

Homework Statement Find the arclength of $$r(t) = <{t}^2/2,{t}^3/3>$$ from t=-1 to t=1 Homework Equations I have used this equation for arclength $$\int_{-1}^{1}|{r}'(t)|dt$$ The Attempt at a Solution After integrating (using u substitution) I have the solution...

I was doin' some coursera quiz. It asked this question : Let ƒ(x) = (x2 - x - 42) / x-7 find as x → 7. Now I approach x from both sides and it get me 2 different answer. So which one is correct: 13 or 14?

Homework Statement I have been working on the problem below and I am stuck. I am stuck primarily because of the part where is says x=0. If x-0, it should cancel everything out. The derivative of 0 is 0 so will cancel everything out I think, so I am not sure if that is the reasoning and the...

Homework Statement A cannon shoots bullets of mass m0 and velocity v0 at a massive log of wood of mass 100m0. the interval between the bullets is t0. the surface is smooth. the bullets are stuck in the wood. the penetration time of the bullets is very short, relative to t0. 1) What's the log's...

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xfa1/v/t34.0-12/13100972_1004336679646107_71786442_n.png?oh=c0e0ad9cf30125d301d2069c6402b621&oe=57222F24&__gda__=1461854936_dad2ac5d3bd3a844b9428cd47c7dc733 Not sure if this counts as "advanced physics homework" but can someone please help me...

So I'm a second year community college student, I only have a few days left to pick my classes for the fall, and I have no idea which one I want to major in. I guess the one MAJOR plus to doing engineering is that my community college offers an associates in mechanical engineer, but not in...

Homework Statement I am trying to derive the equation for the charge of a capacitor as a function of time: Q (t) = Qmax (1-e^(-t/tau). Homework Equations Kirchhoff's loop law I (t) = dQ(t)/dt Delta Vbat= Epsilon Delta Vresistor= -I*R = [-dQ(t)/dt]*R Delta Vcapacitor= Q/C Qmax = C*Epsilon Tau =...

I'am trying to prove \int e^{ix}cos(x) dx= \frac{1}{2}x-\frac{1}{4}ie^{2ix} Wolfram tells so http://integrals.wolfram.com/index.jsp?expr=e^%28i*x%29cos%28x%29&random=false But I am stuck in obtaining the first term: My step typically involved integration by parts: let u=e^{ix}cos(x) and...

Homework Statement Light of 576 nm wavelength is directed at a two-slit apparatus and produces a famous intensity pattern on a screen 75.0 cm away. Each slit is 0.434 mm wide, and the center-to-center separation of the slits is 0.640 mm. Given that the intensity at the very center of the...

Homework Statement Find the arclength of the curve x = ⅓(y2+2)3/2 from y=0 to y=1. Homework Equations (Please forgive the crazy definite integral symbols - I'm taking a LaTex class tomorrow so hopefully I'll be able to communicate more clearly from then on..!) arclength of curve = ∫ab √ (1 +...