Recent content by kregg34

The second question had multiple parts.

He said he wouldn't test certain things, but he tested them anyways. Also it was only 2 questions, if you didnt get the final answer 100% correct, you got 0 points. And one person got 55%, next highest 30%.

I am currently taking 5 classes, all 3rd year physics. Would it look bad on my transcript if I dropped one? The class average on the midterm was 7% and the prof said that the next midterm would be harder, many people got 0% on it. It is a mandatory class (Electromagnetism). Another prof is...

Homework Statement How can I show that if a vector (in a vector space V) cannot be written as a linear combination of a linearly independent set of vectors (also in space V) then that vector is linearly independent to the set? Homework Equations To really prove this rigorously it would make...

Ok I found two equations for the two components, (y is perpendicular to coil, z is parallel) B(in y) =(|μ|/r^3)*(3cos(θ)-1) B(in z) =(3|μ|/r^3)*(sin(θ)cos(θ)) but what is μ and how do I calculate it?

Homework Statement For a lab we need the equation of the magnetic field strength produced by a solenoid a distance r away from it (outside of it). I tried looking online and couldn't find one that didn't involve a bunch of cross products or similar. Wonder if anyone knows the formula? I know...

Figured it out, thanks man!

u'(x) = cos(√x)/(2√x) s'(ξ) = cos(ξ) (dξ/dx) and ξ = √x so dξ/dx = d√x/dx = 1/(2√x) aren't they the same? or should I write s'(ξ) = cos(ξ) (dξ/dξ) = cos(ξ) with respect to ξ instead of x?

Not sure I understand. Cause I thought the transformations of u(x) were basically saying u(x) = s(√x). So I took the derivative of both sides with respect to x and substituted u'(x) and u''(x) in

oh sorry, that's how I derived it but I wrote it wrong. x is measured from the free end of the chain upwards

On the question it actually gives you that equation, you have to derive it, and that's what it is

Homework Statement I am trying to find an equation for a free hanging chain of mass m and length L. The chain is hanging vertically downwards where x is measured vertically upwards from the free end of the chain and y is measured horizontally. Homework Equations [/B] I derived this...