Recent content by TheBlueDot

Thank you for your response. My theoretical and measured data are very close. The lab instruction just asked for analysis which is kinda vague. :D

Hello, My question is what types of data analysis can I perform on a set of theoretical and experimental results? For example, I have v(x) = cos(x) and I plot my observed data to v(x). Thanks!

Hello, I'm trying to write a wave function for a perturbed system. The original (unperturbed) wave function has two solutions for even and odd n-values, for example ##sin(n \pi x)## for even-n and ##cos(n\pi x)## for odd-n. Then, the perturbed wave function also has an even and odd solutions...

@stevendaryl, Thanks for your response. I feel silly now. I looked at the ##sin^2(\theta) -1 ## and thought it was ##cos^2(\theta)##.

Hello, I'm trying to calculate the measurement of the orbital angular momentum of the state l=1 and m = -1. The operator for the angular momentum squared is ## L^2 = -\hbar (\frac{1}{sin\theta}(\frac{\partial}{\partial \theta}(sin\theta\frac{\partial}{\partial \theta}))...

Hi jambaugh, Thank you for your response. The part I'm confused on is if I use Rg the moment of inertia (assume a cylinder) would be I= mRg^2, but if I use 'r', then I=1/2 *mr^2. I guess I don't understand where the question is leading...

Hello, I'm given a problem of a mass rolling down an incline with mass 'm', radius 'r', and radius of gyration Rg, and I need to write the Lagrangian for the motion. I'm confused on why both r and Rg are given. Don't I just need one of the two for the moment of inertia? Thanks!

Hi phyzguy, Thank you for replying. For the problem I'm looking at, J(s) = ks, where k is a constant and s is the radius of the cylinder. With that J(s), I got $$A = \frac {\mu_{o}} {4\pi}\int \frac{a*s(sdsd\phi dz)}{s}\hat{z}$$. Is this correct?

Hello, I'm current studying magnetostatics and I'm struggling to understand the equation for A. Here is the equation from Griffith in the attachment. My confusion is, if the object is a cylinder and the current density is a function of s, J(s), then how would I write r-r'? Thank you!

No, I would not :)) . I didn’t think about it. My system doesn’t have rotary restriction and my program always home the stage at the start. There is an IR sensor to detect home.

Thanks guys for replying. From Asymptotic’s comment, I think the encoder is required. My system requires high precision and must be able to rotate both ways, and the stepper and the encoder are connected by a coupling. Mechanically, I’m still a bit confused on why there would be discrepancies...

I apologize in advance if my post is in the wrong section. I'm writing a program to control a stepper motor. The motor came with a motion controller and an encoder. I'm not sure how the encoder should be used. I can program the controller to set the "zero/reference" point and tell the stepper...

Homework Statement Write the equations for the two mesh current i1 and i2. The circuit and the answer to mesh 1 are showing below Homework EquationsThe Attempt at a Solution My answer came out to be the same as the answer key except for the -25di1/dt term. It seems that this term gets...

Thanks for the responses. I had iL = (1/L)∫[25exp(-800t)*[cos(600t)+(4/3)sin(600t)] ]dt and I used WolframAlpha to evaluate the integral. The answer was in the right form but the coefficients were off. Thanks!

Homework Statement R = 125 ohms, L = 200 mH, C = 5 uF, initial current in L is -0.3A, and initial voltage across C is 25V. Homework Equations v(t) = (Bcos(wt)+Csin(wt))e^(-at) The Attempt at a Solution I've solved for v(t) t>0 and got 25e^(-800t)(cos(600t)+ (4/3)sin(600t)). The second...