Recent content by Geoffrey F. Miller

Okay. Let's say you have a coil. You drop a magnet through it, which induces an emf (please explain what exactly an emf is). So, somehow Faraday's Law of Induction comes into play (please explain this law to me). Now you have an incoming and outgoing flux, right (I have no idea what this means)...

One more thing before I go, does the ohmmeter require electricity to be running through a wire to take its measurements, or does it test the material directly?

Okay. Also, why do electrons move faster and more effeciently through metals than nonmetals? What are the characteristics of a good conductor? Does it have something to do with the way the atoms or molecules of a substance are arranged?

Ahhh...I found an ohmmeter, and yes, it does use Ohm's Law. Thank you for your help! Also, do you know how a wire's mass would affect its resistance? I'd assume more massive wires would be less resistant... :confused:

I need to be sure that it's called an ohmmeter though. I don't want to introduce to many calculations into my experiment, as it's only supposed to focus on how a wire's length, shape, mass, thickness, and material affect its resistance.

What is the name of the device used to measure ohms? :confused:

What equation(s) is/are used to calculate an object's moment of inertia?

I guess the hoop would have a greater moment of inertia, but why is it greater? How is rotational inertia calculated?

I'm having some trouble with a conceptual problem. Your help or input would be greatly appreciated. Here's the problem. A disk and a hoop, both having the same mass, are rolled down a hill. The disk rolls faster than the hoop. Why is this so? Thank you for your time!

Thanks! I would of never guessed that.

Then it is what I'm looking for. Thank you Tigers2B1.

I'm sixteen, not after chicks (already got one :wink: ), and looking for extracurricular activities. I think mensa would be a great since I like pretty much anything relating to math, science, English, art, philosophy, and history. This is what mensa's about, right? Does someone here know for sure?

How does everyone else feel about this?

Has no one else figured this out yet? :surprise: There must be an answer! Someone, please help!

Still haven't figured it out. Does anyone have an idea?