Recent content by Mr. Heretic

Oh my god, I can't believe it was that... I accidentally did one rotation of the hour hand per 24 hours instead of per 12. Now I'm getting the right answer and I can know my side-step of a method is valid. Thanks, Voko.

Homework Statement "On a certain clock, the minute hand is 8 cm long and the hour hand is 6 cm long. How fast, in cm/min, is the distance between the tips of the hands changing at 9 am?" Homework Equations The Attempt at a Solution I should be able to transform this somewhat...

Thanks guys, it all makes more sense now.

Thanks for your response, that does poke a hole that needed to be poked in my previous attempts to understand, but it doesn't fill it back up as far as I'd hoped - what I'm trying to visualise now is so abstract... Do you (or anyone else reading this) have any other ways to suggest thinking...

So I ran into residue theorem recently and found it to be pretty amazing, and have been trying to get some of the more fundamental aspects of Laurent series and contour integrals down to make sure I understand it properly, but there's still one big aspect that keeps confusing me majorly...

From a quick wiki, rolling resistance would rely on deformation of the cylinder or the surface. Based on the low level at which we've studied friction so far, I'll venture it can be ignored in this problem. Will go with the second method, cheers. :]

Thanks for responding. And sorry, I didn't have enough time to word it perfectly on account of needing to attend a lecture, I'll find the original wording and edit the first post. As for energy loss, I'd treat that as a special case. With this there is definitely slipping, and non-zero...

Homework Statement EDIT: A solid homegeneous cylinder of mass M and radius R is moving on a surface with a coefficient of kinetic friction μ(k). At t=0 the motion of the cylinder is purely translational with a velocity v(0) that is parallel to the surface and perpendicular to the central axis...

Thank you, I had a feeling they might be reciprocal. I'm fairly sure we won't go into the more complex stuff in the exam so it doesn't matter too much, but be I'll looking into relativistic velocity addition and the twin paradox.

Neither, ghwellsjr, I'm simply looking for examples of problems involving use of said factor/method to solve, such as above.

I was bored so I went with my own problem (see Note 2). But before I go into that, this isn't a particularly creative or difficult problem, so I'd just like to say I'm definitely still interested in more. And I have an important question. What is the formula for...

One idea that springs to mind is iron filings forming field line patterns, but I don't think this is ideal. I would say the most 'natural' inductor is just a single piece of wire, but you can't have your cake an eat it too. If you want it to be sensitive, you may have to go beyond your...

My physics teacher has informed us that for our mock waves exam we are going to be given some relativistic questions on doppler shift, as an experiment by our loving masters. We derived the Lorentz factor and some shift equations, but we haven't done anything else and I'd really like some...

A basic, low power LED in a very simple series circuit with an inductor (http://en.wikipedia.org/wiki/Inductor) will light up when moved (in correct orientation) through regions of high magnetic flux density, sensitivity would depend on the quality of the inductor etc.

Ooh, certainly seems like they are "Newton's Rings", had never heard of them. Did a bit of reading, but I'm still not sure I understand the exact mechanism that's causing the interference to occur in this instance, then again it's 2:18AM. I'll interrogate my physics teacher about them...