Recent content by srhelfrich

Sure, the math works. But why is it significant?

Yeah, I just realized the range is from 0 to pi/2. The angle is measured wrt the normal of the wall.

I understand that it works out mathematically. I also figured out that theta is measured with respect to the normal of the wall so now I see why it shouldn't be zero. But what is the significance of finding the average value? Why is this something we would be interested in calculating?

In kinetic theory, the number of molecules hitting a unit area of a surface per unit time with speeds between v and v + dv and angles between \theta and \theta + d \theta is found to be a function of sin(theta) and cos(theta). There will often be a practice problem asking to show that the...

Does anyone know why the problem asks for y=y(x) but the solution is in the form x=x(y)?

Thank you! I looked it up and you're right, I see where they start with the limit and expand from there. Much appreciated!

1. Prove a) r=(u*v)=r*u+r*v and b) d/dt(r*s)=r*ds/st+dr/dt*s 2. Homework Equations : b) dr/dt=lim t->0=Δr/Δt and Δr=r(t+Δt)-r(t) 3. Attempt at the solution: Okay, so I was able to work out part a but I'm not quite sure how to start part b. Could anyone point me toward a useful resource to...