Recent content by feedmeister

Thanks, IssacNewton. When substituting in \mathbf{a}\bullet \mathbf{b} and \mathbf{b} into the equation, it looks like it'd simplifies further.. but it looks like it'd be ugly. Any good way of simplifying it? Thanks,

Thanks, but I didn't think that \nabla\bullet (\mathbf{a} \bullet \mathbf{b})\mathbf{b} was the same as \nabla (\varphi \mathbf{F})... there's still a \bullet between the \nabla and the rest of the statement. Can you clarify?

Quick question… what does the following simplify to? Can it be written in any other way? \nabla\bullet (a \bullet b)b where a and b are vectors. Thanks,

Hi All, I was given the challenge of building a high flow rate pump, but I haven't been able to find any resources were useful. I'd like to control the pump and its pulsatile nature with a LabVIEW VI. I know I'd have to get a stepper motor and a DAQ board, but I'm not sure where to begin. I'd...

Hi all, I've been struggling with the concept of equilibrium and steady state in a metal wire. Can anyone of you please help me get this important concept down? I'd really appreciate it. -- Homework Statement Which of the following statements about a metal wire in equilibrium are...

Yeah I figured it out. It's actually just Bmagnet/Bcoil. Thanks,

Homework Statement A bar magnet with magnetic dipole moment 0.51 A m^2 lies on the negative x-axis, as shown in the diagram. A compass is located at the origin. Magnetic North is in the negative z direction. Between the bar magnet and the compass is a coil of wire of radius 1.5 cm, connected...

Yep, thanks a lot.

Homework Statement A very long wire carrying a conventional current of 4.8 amperes is straight except for a circular loop of radius 7.7 cm. Calculate the approximate magnitude of the magnetic field at the center of the loop. I know that I=4.8A and r = .077m u_o = 4*pi*(10^-7) Homework...

Homework Statement Figure 16.69 A thin spherical shell made of plastic carries a uniformly distributed negative charge -7e-10 coulombs (indicated as -Q1 in the diagram). Two large thin disks made of glass carry uniformly distributed positive and negative charges 1.7e-05 coulombs and...

Oh I figured it out, it's just v=r*omega Thanks for the help. I really appreciate it!

Hey, I got the radius, but how do I get the velocity? I tried L=rmv Thanks

Hey Bill, Thanks a lot!

Homework Statement "During most of its lifetime, a star maintains an equilibrium size in which the inward force of gravity on each atom is balanced by an outward pressure force due to the heat of the nuclear reactions in the core. But after all the hydrogen "fuel" is consumed by nuclear...

Wow, thanks dynamicsolo, I've been trying to think of scenarios in which those cases would happen, but I never thought to have constant velocity and have it fall through something. I appreciate your help!