Recent content by EthanB

Actually, I was using the right moment of inertia. It's a hollow cylinder. Ok, so can anyone help me out?

Oops... I was using the wrong moment of inertia. It won't let me delete the post. Thanks anyway.

Homework Statement A solid cylinder of radius R sits at the top of a slope of angle theta. When it rolls down, what is the minimum coefficient of friction (k) required to make the cylinder roll without slipping?Homework Equations Fx: mgsin(theta) - kmgcos(theta) = ma Torque: kmgRcos(theta) =...

As for why current is constant in the wire... You know those toys that people who sit behind big desks at work like to have? Where there are 5 or so metal balls hanging from a horizontal support, and when you pick the ball up from one side and let it drop onto the others, the ball at the other...

Yar! The electron's got all this energy to conserve. It would have to lose some if it wanted to stick around. I'm not sure what it means to talk about collisions between the constituents of an atom, either. Hmm. In any case, here are a couple of interesting links that talk a bit about the...

So what you're saying is that in a stable atom electrons don't orbit nuclei, they simply stick to the protons? There's more than meets the eye! *hums Transformers theme* Another way to think about it would be through mechanical energy.

If you think of current as flowing you can compare it to water. Imagine water pouring through a hose. Further imagine that one section of the hose is thinner than the rest. The water doesn't need to know that the hose gets thinner in advance... it simply slows down because the water in front of...

Solve for where the forces are equal. Then, find the work required to move from your current radius to the calculated height.

I'm having a hard time picturing the problem.

Perhaps they wanted you to find the work required to move the craft from its orbit to the point at which the gravitational force from the moon and Earth are equal and opposite.

If the x direction is parallel to the slope, Fx means the forces parallel to the slope. I mean force applied by Fa.

More importantly, draw it next time! =)

I use the word sphere. =)

I'm not sure what extra Newtons you're referring to. Lay out to me what you have and I will go from there. Try to be as specific as possible. Use a format such as: Fx(on wagon) = Fa - Ff(ramp) ... etc.

The wave took, in total, 0.13 seconds to go down and up. It spent 0.0875 seconds in the air. This leaves 0.13 - 0.0875 = 0.0425 seconds that the wave spent in the water. The wave had to go all the way down, then all the way up. The same distance each way. This means that half the time it was...