Recent content by Ravenatic20

I was going through my textbook, Introduction to Electrodynamics, and I came across this question that puzzled me. The book is really great by the way, I would highly recommend it. No, this isn't a homework question, it just got me thinking. For a finite line of charge (like a rod, for...

I found out what I was doing wrong. It's really stupid. When solving for N, my value for tau(7.04 microseconds), I didn't punch it into my calculator right. Was entering 7.04 instead of 7.04X10^-6. The answer I got then was right, about 1.13X10^4. Mark this problem as solved. Thanks...

Dick, thanks for catching that gamma is dimensionless. If anyone has any last minute ideas please post them. Thank you.

I apologize for the shameless 'thread bumping', but I'm really stuck on this problem and could use some help. It's due in about 12 hours so that's why I'm rushing now. I don't like turning in HW I know is wrong.

Homework Statement The muon is an unstable particle that spontaneously decays into an electron and two neutrinos. If the number of muons at t = 0 is N_{o}, the number at time t is given by N = N_{0}e^{-t/\tau}, where \tau is the mean lifetime, equal to 2.2 \mu s. Suppose the muons move at a...

You're right. I ended up solving the problem. Thanks anyways. Consider this problem solved.

Homework Statement A 2000-kg car moving with a speed of 20 m/s collides with and sticks to a 1500-kg car at rest. Show that because momentum is conserved in the rest frame, momentum is also conserved in a reference frame moving with a speed of 10 m/s in the direction of the moving car...

Thank you. I always over complicate things. I believe I know how to do it now. To answer your question, y is -b\omega^2\cos(\omega t) and z is 2c Now I square them, add them up, and take the square root of that sum (this:||\mathbf{a}||=\sqrt{a_x^2+a_y^2+a_y^2}). Correct?

So I take \mathbf{a} (the second derivative above), and factor in x for the first part. So it would look like this: \mathbf{a_x}(t)=[-b\omega^2\sin(\omega t)\mathbf{i}-b\omega^2\cos(\omega t)\mathbf{j}+2c\mathbf{k}*\mathbf{b}sin(\omega t)]^2, where \mathbf{b}sin(\omega t) is x. Then do...

Thank you guys :) Now what is the first step in calculating the magnitude? I am used to plugging in numbers to do that.

The first derivative: ib\omega cos \omegat - jb\omega sin \omegat + 2kct Second derivative: -ib\omega^{2} sin \omegat - jb\omega^{2} cos \omegat + 2kc Is that right?

I hope I posted in the right place. Sorry in advanced. Homework Statement A buzzing fly moves in a helical path given by the equation r(t) = ib sin \omegat + jb cos \omegat + kct^{2} Show that the magnitude of the acceleration of the fly is constant, provided b, \omega, and c are...

\int_{e}^{infinity} \frac{dx}{x \ln x} = \int_{e}^{infinity} \frac{1}{x \ln x} dx = \int_{e}^{infinity} \frac{1}{\ln x} d \ln x = ln|lnx| + C evaluated from e to infinity I think I know what I need to do next, I just want to make sure I'm good up to this point. Also, how do you put in an...

Haha no offense taken and thanks for your help!

No I'm not drunk, I'm just new to this material. However I think were just about done: I understand how you did everything, so now... 4\int(\sec \theta \tan \theta) \tan \theta d\theta=4(\sec \theta \tan \theta-\int\sec^{3}\theta d\theta) Where... \int\sec^{3}\theta d\theta) =...