# Recent content by shizzle

1. ### I need a math mentor

Ha, Monet, I get you. I had a similar experience. I walked into a mathematical methods for physics class that i'd heard horror stories about. intimidated. I was only taking it because it was required for my then major. Anyway, i expressed my fear to my professor and she said something like: "It...
2. ### Degree of forbiddenness

How do we calculate degree of forbiddenness? Can someone do an example to show me?
3. ### Top Medical Physics Graduate Programs

I am almost done with my junior year at a top 15 liberal arts college. I'm majoring in physics with an overall gpa of 3.5 which I hope to pull to a 3.6 by graduation. My physics gpa is about 3.85. I am interested in attending a top school to do medical physics. Duke, UChicago,UW-Madison, and...
4. ### Hamiltonian of flyball governor

Okay, Daniel, my post looks a bit more intelligible :yuck: now so please check it and give me some feedback aight:) I actually love doing physics this way. I mean physics is fun even if its hard but this is waaaay cool. I'm becoming a physics forum adict. :biggrin: okay, back to the...
5. ### Hamiltonian of flyball governor

Hamilton equations of flyball governor I'm trying to find 1. The Hamiltonian 2. The Hamilton equation of motion for the flyball governor shown in problem 2 here http://www.srl.caltech.edu/phys106/1999/Homework3.pdf This is what i have. Can someone tell me if i'm right...
6. ### Sphere rolling up an incline then back down

so t = 7v/5gsin (theta) but v = vi so t = 7vi/5sin(theta)? It just seems wierd that we're suddenly replacing the velocity with which it hits the ground with its initial velocity (even though i understand that vf = vi) Is there something i'm missing? or am i just thinking too hard?
7. ### Sphere rolling up an incline then back down

okay, but when i solve for t, my expression will involve v not vi. Should i then make vi the subject of my x expression from a) and plug vi into my t? (the vi expression will involve v meaning my final t expression will involve v) I'm also not really sure why you say v = vi at the end. Is it...
8. ### Sphere rolling up an incline then back down

Hey Doc Al, Thanks. I think i figured out the 3rd part. I first found the acceleration. since w = v/r ; v = wr a = w(dot -on top of it--hehe) r w(dot) = a / r I w(dot) = Fr where F is friction ma = mg sin (theta) -F If you plug expression for F into it a = 5/7g sin(theta)...
9. ### Sphere rolling up an incline then back down

Need Help Here!! A sphere or mass, m and radius r rolls along a horizontal surface with a constant velocity, Vi approaches an incline with (angle theta). ie bottom angle :smile: If it rolls without slipping, a) what is the maximum distance,x it will travel on the incline? b) If it begins to...
10. ### Oscillating rectangular plate

ha ha ha. I think it is possible to simplify it further actually. so... can i simplify (a^2 +b^2) / (a^2 + b^2)^1/2 = (a^2 + b^2 )^1/2 ? simply playing with the exponents. ie. 1-1/2
11. ### Oscillating rectangular plate

How do i find the period of small oscillations and length of the equivalent simple pendulum, for a rectangular plate (edges a and b) suspended at its corner and oscillating in vertical plane? T = 2pi (I/mgl)^1/2 i calculated l (length) to be (a^2 + b^2 )^1/2 ---(the diagonal) is this right...
12. ### Moment of Inertia of rectangular plate

The distance between one corner of the rectangle and the center is going to be (a^2 + b^2 )/4 right? so if i plug this into the equation as my 2, that shd work. I'm using pythagorean theorem to find this r.
13. ### Moment of Inertia of rectangular plate

I = Icm + mr^2 I = (M(a^2 + a^2))/12 + m (a^2 +b^2) ---I'm b=not sure what r to use. I = the sum once i know what r is
14. ### Moment of Inertia of rectangular plate

assuming this is right, i have no clue how we'd find the MI when the axis is perpendicular to plane but passing through a corner instead of cm?
15. ### Moment of Inertia of rectangular plate

Okay, lets see...:) I = r^2 dm --according to definition:) rho = m/ab dm = rho * da*db (since x and y are really a and b in this case--right?) dI = r^2 * rho* da*db dI = (r^2 * m * da* db )/ab i will then have to do a double integration right? over limits 0 to a/2 and 0 to b/2...