Recent content by Ambidext

My best guess is that Kepler's 3rd law applies to an elipse (http://en.wikipedia.org/wiki/Semi-major_axis), where as what you're doing is plucking the value of a circular radius directly into Kepler's 3rd law. Whether I'm right or wrong, I'm equally interested to hear from someone who can...

How did u get the acceleration? Did you include the Earth's radius plus 300km?

I see it as more of a "check" rather than a proof. physics can get very ambiguous sometimes. When you come across Daniel schroeder's thermal physics you'll see what i mean. :p

Sorry for 2 year late reply. You're probably graduated by now. But according to Schroeder's book, for part (a), you can simply throw away the 2 because the multiplicity is very large compared to the 2, and thus it won't really make a difference. He then apologizes below for sloppy working...

How/where then should I start?

Homework Statement Show that a free electron cannot absorb a photon and conserve both energy and momentum in the process. Hence, the photoelectric process requires a bound electron. (Eisberg and Resnick 2nd Ed) Homework Equations hv = E p = K / c E2 = (pc)2 + (m0c2)2 The Attempt...

Fortunately you're asian- we're taught in my country to remember sine/cosine functions with the phrase "toa cah soh" (big foot woman). Here's how we've been trained to remember which function to use: TOA: Tangent X = Opposite / Adjacent CAH: Cosine X = Adjacent / Hypotenus SOH: Sine X =...

Ok, I'm studying electric fields this semester, covering Gaussian Law, capacitance, dielectric circuits and dc circuits. Test coming up this thursday- open book. Which really bothers me alot. Judging from the standard of papers thus far, if the prof is allowing open book test, that can only...

Thank you all for the replies. Been reading a few sources here and there, and I think I get a bigger picture as a whole.

Today in a lecture, prof asked that for 2 bulbs connected in series(100W and 40W), which was brighter? And the answer was the 40W bulb. His explanation was that we use P = I2 R. Higher power rating means higher R, and thus less bright. I argued that since P = VI, and I is constant, P is...

Just a general question on the EM spectrum. angle deviation of the light wave as it passes through a prism seems to be inversely related (looks like a 1/x graph) to its wavelength. So my question, why? My guess is that the deflected path is shorter than the undeflected by cos A, where 0...

Also, becareful which axis you use. If you want to take the book's direction of travel to be the x-axis, then you need to ressolve for g. If you wish to take g as the y-axis, then you need to ressolve for the x and y components of the sliding motion. After you've decided on your axis...

The way I see it, there's nothing wrong. I got the same answers as you.

Kinetic energy isn't conserved- it's energy that is conserved. Etotal = Epotential + Ekinetic + Einternal "Momentum", like "force" are merely concepts if you think about it. We can't see or feel a force. These concepts are experimental and yet have been predicting motion in inertial...

Alright, thanks for the hints! :)