Recent content by GoldShadow

Haha, nice. Did you write that or did you find it somewhere?

Pressing on any muscle will discharge some of its electricity, so compressions would cause a spike on an EKG. Heart muscle is myogenic, which means it produces its own electrical impulses and rhythmic contractions, not the brain, though the brain certainly can and does regulate the rhythm. As...

I imagine that personality is an extremely complex multifactorial set of traits; in other words, there's no "gene" for jealousy, but rather, a whole set of genes that are responsible for general personality and behavior. Then, you have to keep in mind that personality is also extremely variable...

What Danger said... with modern medicine and all the amenities available to us today, we are actively fighting selection.

Using the creationist's logic, one could also ask, "why do some humans still live in huts and speak in clicks while others have built cities and spacecraft and supercomputers?"

One more bump

Nobody?

Homework Statement A man is traveling on a bicycle at 14 m/s along a straight road that runs parallel to some railroad tracks. He hears the whistle of a train that is behind him. The frequency emitted by the train is 840 Hz, but the frequency the man hears is 778 Hz. Take the velocity of...

Ah, okay, I get it now. Since there is both rotational and translational motion, \Delta K should include both types of kinetic energy. And work due to friction is positive because it acts in such a direction that makes angular velocity positive? So my new equation would be...

Homework Statement A 392-N wheel comes off a moving truck and rolls without slipping along a highway. At the bottom of a hill it is rotating at 25.0 rad/s. The radius of the wheel is 0.600 m and its moment of inertia about its rotation axis is 0.800MR^2. Friction does work on the wheel as it...

Ah alright, I got it (v=2.81 m/s)... it turns out I did punch in a wrong number somewhere, I hate it when I do that, heh. Anyway, thank you for the help Dick, I really appreciate it!

Alright, I added the kinetic energy into the equation (kept the left side the same since kinetic energy is 0 for both blocks when they're at rest) and solved for v: m_{1}gh_{10}=m_{2}gh_{2}+\frac{1}{2}I\omega^{2}+\frac{1}{2}m_{1}v^{2}+\frac{1}{2}m_{2}v^{2} Using v=\omega r and isolating \omega...

Homework Statement Problem reads: The pulley in the figure has radius 0.160 m and a moment of inertia 0.480 kgm^2. The rope does not slip on the pulley rim. Use energy methods to calculate the speed of the 4.00-kg block just before it strikes the floor. Homework Equations...

:smile: As for me, I'm just a lowly undergraduate majoring in Molecular and Cell Biology, and seriously considering medical school. I'm also a certified EMT-B if that counts for anything. At the moment, I'm trying to get a position in my cell biology professor's lab to see if I would...

I believe you are looking for synaptotagmin: http://en.wikipedia.org/wiki/Synaptotagmins