# Recent content by tydychic

1. ### Energy Needed to Ionize a H-atom

Nevermind. After consulting my excellent, omniscient professor, I learned I have the right set up and he explained the electron volt stuff. Thanks!
2. ### Energy Needed to Ionize a H-atom

Homework Statement A H-atom when in its lowest energy state consiste of a proton nucelus of charge +e and an electron of charge -e and mass 9.11e-31. In the Bohr model of the atom, the electron moves around the nucleus in an aprrox. circular orbit of radius .51e-10m. The speed of the...

You wouldn't happen to know a dude with a yo-yo, would you? Because if you did, then yes, same class. Definitely the same book. That, I chalked up to book-error. I couldn't get any other answer and the book is known to be wrong occasionally.

Due to your confusion, I double checked and realized that I didn't need to use the v=omega*L constraint.

I got it I got it I got it. This unit check is going to suck big time, but I got the numbers. Pardon me while I pass out from mental exhaustion.

I replaced omega with V/L

Sorry, Latex was giving me some trouble when the equations started getting complicated and I had to clean it up.

Okay, here goes: m'vL=I\omega, I= \frac{m}{3}L^{2}+(m'+M)L^{2} m'vL=(\frac{m}{3}+m'+M)L^{2}\omega m'vL=(\frac{m}{3}+m'+M)L^{2}(\frac{V}{L}) m'vL= (\frac{m}{3}+m'+M)LV V=m'vL/((m/3)+m'+M)L .5((m/3)+m'+M)[/tex](L squared)(V/L) = mg(.5L)(1-cos(theta)) + (m' +M)gL(1-cos(theta))...

well, r = L = 1m, so none of the values would change, so the erroneously way I calculated it before would have yielded the right answer. But that's obviously not right.

It's defined L=Iw, but the bullet is traveling in a straight line (I'm so ignoring projectile trajectory when I say that) so it doesn't really have a rotational axis. It does once it hits the block, but then that wouldn't be pre-collision, so I don't see how it can. I can completely see how...

Okay, I've seen several solutions to similar problems where they set it up mvL=Iw...where does the L on the left side come from?