Recent content by cubejunkies

Is there not a difference between bias as in "A diode is forward/reverse biased" and establishing the terminal voltages/currents needed to bring say a transistor to the quiescent point? Just curious

Newton's first law states that unless an unbalanced force acts upon a body of matter, causing the mass to accelerate, the mass will stay at rest or travel indefinitely in a straight line with a constant velocity. Pendulums oscillate because gravity and the tension in the pendulum string/cable/...

I saw the equation here http://en.wikipedia.org/wiki/Magnetic_moment#Current_loop_definition for the definition of the magnetic moment for a non-planar loop. Can someone tell me if there's a name for this equation m= \frac { I }{ 2 } \int { \overrightarrow { r } } \times d\overrightarrow { r }...

OH WAIT NEVERMIND haha I did some algebraic gymnastics and figured it out :)

Wait, why does Ro=Ri(1+δ) ? I don't get the (1+δ) part. I also tried expanding as they did on that webpage listed above, using Ro = Ri + r and expanding that, but I can't cancel stuff down like they did and the magical appearance of the factorials in the last step confuses me. Thanks Anthony

So I've been trying to derive the moment of inertia equation for a thin spherical shell and I've slammed into a dead end algebraically. I was able to derive an equation for a hollow sphere: I = (2/5) M (Ro^5 - Ri^5)/(Ro^3 - Ri^3) where Ro is the distance to the very outside of the sphere...

Hey so I'm trying to self study for both AP Physics exams for May 2012, and I've been going through halliday & resnick 7th ed. as a text, however, I feel that this book isn't helping me so much for the mechanics side of things (as I haven't begun to study E&M stuff yet) for two reasons. First...

I've found that syllabus already, and I checked the school website, and I'm fairly certain the McGehee is retired, as my instructor told me that he wrote the workbook when she was still in college, and she is, with all due respect, somewhat older, so I don't think he has an email lying around...

My instructor told me that this unpublished text would aid me greatly in my self-studying for Physics C E&M test, however, since it's unpublished, I have no idea where to find one and my instructor doesn't find one. Any suggestions? Thanks Anthony

My teacher gave us this problem before break in a packet and we basically had to teach ourselves how to do problems like this, and unfortunately, I'm no natural at physics and I might only just have the right equation to apply to the problem yet I have absolutely no understanding of how to use...

If the only force acting on the object is the force of gravity, you can use g as the acceleration

Draw a free body diagram. What forces are acting on the cannonball as it rolls down the hill?

Thank you so much! I got it right! I tried the problem two other ways before the attempt shown below getting it wrong, but when I finally did: ((10*12*3)-(4*4*pi))/((10*12)-4*pi) which yielded 2.88303, I was right! Thank you so much! :)

Once I do that, what do I do about the circle though? I still am completely lost and don't know what to do :/

A uniform flat plate of metal with dimensions 10x 12 is situated in a reference plane with its bottom left hand corner at (-2, -6) and its upper right hand corner at (8, 6). The plate has a circular hole cut out of it centered about (4,0) with a radius of 2. Find the x coordinate of the center...