Recent content by cardinalboy

Still Confused Hi Doc Al, Thank you very much for your reply. I greatly appreciate the help. I give you a lot of credit for reading through my long post! :redface: I read through your explanation and I now understand the first question (question 46 in the attachment below), but it still...

Greetings everyone, I have a question about determining electric fields when given parallel planes of charge. In particular, I need some help getting the sign conventions straight in my head. I've attached 2 quick problems with solutions in a Word document so that perhaps you can help me to...

One more quick question... Thanks for your help guys! I've got one more question... Let's now say a light wave enters a pane of glass from the air, travels through the glass, and then exits the other side of the glass, where there is only water. As the wave enters from a material of lower...

As a light wave enters from a material of lower refractive index (air, say) to a material of higher refractive index (glass, for example), the speed of the wave and its wavelength both decrease. Let's say a light wave enters a pane of glass and then exits the other side of the glass, back...

Second Attempt At Angular Momentum Post I'm sorry about my poor description previously. :redface: I tried as best I could to give a diagram of the problem I've described above (see attachment). The triangle that I have drawn on the mass (and I've given a bigger version of this triangle off...

Homework Statement A light but stiff rod of length R is attached at an angle theta to a shaft along the z-axis; the rod is used to rotate (a single) mass M about the shaft. The mass moves with speed v in a CCW direction. Describe the angular momentum, L, of the mass with respect to the...

Ahhh! Good point! You got me there... :redface: Thanks for pointing that out to me. It's always good to better understand my errors. :smile: Yes, I like this approach better...it simplifies things for me to think about a single system as opposed to separate systems. Thank you very much for...

Thanks very much for your help. It helps when I consider this problem from the perspective of the forces on the beam only. When doing so, it makes sense that we would be concerned only with the forces acting on the beam, and therefore the normal force exerted by the beam on the mass would not be...

Homework Statement A 3.0 m long rigid beam with a mass of 130 kg is supported at each end. A 65 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam? http://i241.photobucket.com/albums/ff4/alg5045/p13-56.gif Homework Equations Net Forces =...