Recent content by cj

Good advice, thanks!

Summary:: Do my parabolic mirrors need to be really shiny to reflect infrared? I have 2 really old CENCO parabolic reflectors. I need to use them to demonstrate infrared light radiation by placing a heat source near one mirror, reflecting its heat to a second parabolic mirror and...

I think there are 4 unknowns: Tr, Tl, m and x.

That was a typo: but it's the x-hat term in Eq. 5 (I prematurely assigned a "-" sign to reflect the -x direction of E-; but didn't carry it through). I disagree; the j-hat terms are indeed correct as written (this has been widely confirmed, and is a moot point).

I did; I suspect you didn't read my post in its entirety - or you simply are stumped. I'd follow up with clarifying comments - but there's a ton in my post already.

Thank you. I appreciate your feedback. It, does, though, not help at all. What I provided is many steps beyond the scope of your suggestion, and focuses on how to handle the binomial version of the denominator, and how to process it. Again, thanks anyway.

Note: Post edited by moderator: 1. Homework Statement Homework Equations I can't use voltage, nor polar coordinates (got to stick with cartesian). Cartesian vector form of Coulomb's Law The Attempt at a Solution

Ah! Got it! Thank you so much.

Hmm... trying to follow your advice. http://content.screencast.com/users/cjwood99/folders/Default/media/71db2391-5348-4a08-ae6c-d4035fc5f593/Picture1.jpg The stated answer is 6 m/s2, which I'm not finding any way to get. Maybe 6 m/s2 is incorrect?

Homework Statement At a moment in time a particle has a velocity of v = 3 m/s î + 4 m/s ĵ, and an acceleration of a = 6 m/s2 î + 3 m/s2 ĵ. Find the rate of change of the speed of the particle, that is, find d|v|/dt. (better formatted reference...

Homework Statement The photo below shows a stream of water in steady flow from a kitchen faucet. At the faucet, the diameter of the stream is 0.960 cm. The stream fills a 0.125cm3 container in 16.3 s. Find the diameter of the stream 13.0 cm below the opening of the faucet. Homework Equations...

Ah, THANK YOU - very helpful. I've never dug into fictitious forces - much less utilized them in problem solving. Seems like I need to start. Again, thank you.

Ok, I solved the question posed in the attached image. I did so by using the car's center of mass as the location of my axis of rotation, generated torque and force equilibrium equations, and solved for all unknowns. When I try to use another location for my axis of rotation, e.g., the point...

Yes and yes! Yes, I did mean to type VdP rather than VdV. And yes, I can see how VdP is not work. Thank you very much, this is very helpful!

My textbook says, basically, for an adiabatic process... All three variables in the ideal gas law—P, V, and T—change during an adiabatic process. Let’s imagine an adiabatic gas process involving an infinitesimal change in volume dV and an accompanying infinitesimal change in temperature dT. The...