Recent content by wildetudor

Alright, I guess I am a bit clearer on all of this now. Thanks a lot to everyone who responded :)

I thought it'd have been clear by now what my question was, as I rephrased in at least three different ways. It was simply to know exactly what is the primary force that makes an object that is hovering above the Earth stay above the same vertical spot - in the absence of winds with horizontal...

But surely the wind is, in those cases, largely responsible for such an object not remaining above the same spot (as well as, probably, difficulty in controlling the aircraft itself). Probably not easy to answer, but assuming the wind and aircraft control issues stay negligible for the entire...

So then why is a flying object hovering at any altitude above the ground always rotating at the same angular frequency as the Earth, i.e. staying above the same spot?

Yes, my question was really just about the phenomenon that allows flying objects to rotate together with the Earth, and at what point (presumably, when they are far enough) objects become independent of that. Factors such as wind or the mechanism by which the object stays airborne (as you...

Thanks, although I'm still not fully clear on all forces that are at play in these hypothetical situations, and exactly how much of what is above the Earth rotates together with it :)

Oh, of course, should have mentioned that I was assuming the absence of wind in the balloon thought experiment. So the force making any flying object rotate with the Earth is not from a body of air (the athmosphere) but is instead the Coriolis force? And there is no altitude high enough that...

Hi everyone I had this very silly question pop up that unfortunately I cannot find an answer to myself. If an object - say, a hot-air balloon - flies at a low altitude above the Earth, it will of course remain above the same spot; you could I guess say that it rotates together with the Earth...

Thanks for your answers guys!

Sorry, I'm still not clear: so the window blocks out air, not radiation. If the ozone layer reduces radiation (IR, as you say, rather than UV i.e. sun rays) rather than masses of air, then how is this effect similar to the "closed window" effect, so as to warrant both of them the same name, i.e...

So sun shining through the closed windows is still a greenhouse effect (+heat transfer due to thermal radiation)? And the same phenomenon happens, at a planetary scale, with the sun rays as they encounter the greenhouses gases (as opposed to the closed window)? The first effect seems to make...

Hi everyone I realized that I had a mistaken belief about the meaning of the term greenhouse effect. I thought that it refers to the phenomenon whereby there is an exchange of heat due to light but without there being a direct air contact between the body being heated and the surrounding...

Thanks, that's quite helpful, I'll play around with it in Matlab on my own a bit to facilitate intuition :)

Thanks for your replies! I'm afraid I still don't fully understand, though, the link between a time signal's (waveform's) periodicity and its autocorrelation function; and, I could also add, the link between the signal's autocorrelation function and its Fourier transform (the latter of which I...

Hi everyone, I have a sound wave representing a piano piece played at a steady tempo, and would like to get a graph of the saliency of each beat (essentially, a probability distribution for how strong each possible tempo is). I understand that this is done by plotting the autocorrelation...