- Dudra
- Kam
- Wang (hahaha)
This week's Student of the Week is Marcelo E!
The thing I love most about Marcelo is that he is opinionated and he is not afraid to disagree with / debate with others. However, he always does it in a way that is respectful and encouraging. I have had many great conversations with Marcelo including lots pertaining to Politics (Marcelo <3 politics). This is not a topic I have a lot of interest in but Marcelo is so knowledgable and expresses himself in such an understandable manner that I always enjoy such discussions. Marcelo is very easy-going, self-spoken and personable. No wonder, then, that he seems to be popular with so many of his classmates. I have seen Marcelo in conversation with many different students over the years... definitely not someone who isolates himself with a select few friends. I believe that Marcelo has a pretty clear vision for his future and that it definitely includes politics (I told you that he loved it!). I have no doubt that he can succeed though, I must admit, I worry that he displays too much integrity and kindness for the job (okay, I guess that's not nice to say about politicians). Marcelo, you may have switched names since I first met you, but you are still the same great person as always. Thanks for all the nice chats, thanks for all your hard work in my class, and thanks for always being yourself! I admire you greatly and you can count on my (future) vote! Of course, the helicopter shown in the video above isn't actually magically flying without its rotors turning. What's happening is a consequence of shutter speed and frame rate. First, the shutter speed is fast enough to effectively eliminate any motion blur. Second (and the basis of the effect), the rotor RPM is some integer multiple of one-fifth of the frame rate of the camera. What this means is that the blades are rotating at a speed that precisely matches the frame rate and places them effectively in the same position every frame, making it look as if they haven't moved at all. Why "effectively" and why the factor of one-fifth? Because there are five identical blades, meaning that the blades don't have to return to identical positions between frames, only that they have to rotate at a speed such that the set occupies the same overall position in space; it might be that the second blade moves into the fifth blade's slot between frames and so on, but our eyes can't distinguish them, and thus, the helicopter appears to be flying with its engine magically turned off. It's a neat illustration of movement synchronizing with video frame rate.
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P. WadgeI am your teacher. Obey me. Archives
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