An anemometer looks like a weather vane, but instead of measuring which direction the wind is blowing with pointers, it has four cups so that it can more accurately measure wind speed. Each cup is attached to the end of a horizontal arm, each of which is mounted on a central axis, like spokes on a wheel. When wind pushes into the cups, they rotate the axis. The faster the wind, the faster the cups spin the axis.
What kind of power would you need to overcome this obstacle? Why is this such a difficult thing to do? Well, a ninja trying to climb this ladder not only has to do something like a pull-up (no easy feat) he has to end the pull-up with enough vertical velocity so that he can be “airborne” long enough for him to move the bar to the next level. Really, this is the part that makes it tough and this is the part that I want to calculate the power for. Let’s go.
Stereoscopic visualization is seldom used in Astrophysical publications and presentations compared to other scientific fields, e.g., Biochemistry, where it has been recognized as a valuable tool for decades.
@eufisica Thank you very much for RT. I share this from Universe Today http://t.co/gf1uP1H – ChiliDog Observatory (CCantuQ) http://twitter.com/CCantuQ/status/95262242865561600
XII Physics :: Some useful downloads and links http://goo.gl/fb/HzJ4z – Plus Two Physics (plustwophysics) http://twitter.com/plustwophysics/status/32230592913342464
Using data from NASA's Fermi Gamma-ray Space Telescope, scientists have recently discovered a gigantic, mysterious structure in our galaxy. This feature looks like a pair of bubbles extending above and below our galaxy's center. Each lobe is 25,000 light-years tall and the whole structure may be only a few million years old.
Interactive 3D model of Solar System, Planets and Night Sky: "Welcome to Solar System Scope space traveller, SSS means Astronomy for Everybody. Whether you are a student, astronomy fan or an accidental browser, you are most welcome to play with our user-friendly application. It's full of space-art graphics, has easy-to-use interface with various settings and offers interesting information. SSS will illustrate you real-time celestial positions with planets and constellations moving over the night sky. But I can see you're not just a passive spectator - and that's good, because you can actively change parameters for a better understanding of happenings in our Solar System and the Universe." in www.solarsystemscope.com
One of the amusing tales in particle physics is the story of how the “penguin diagram” got its name. We won’t go into that here, instead, we’ll make use of some of the tools we’ve developed with Feynman diagrams to understand the physics behind these ‘penguin’ diagrams. In doing so, we’ll have a nice playground to really make use of what we’ve learned so far about Feynman rules. (Feel free to review the series if you need a refresher!)
The Projectile Motion with Angry Birds lab uses the Tracker video analysis tool to measure and analyze the motion an angry bird projected from a slingshot to hit a pig.<br /><br />The zip file contains the lab handout, a video, and the Tracker…
The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured the velocity of neutrinos from the CERN CNGS beam over a baseline of about 730 km with much higher accuracy than previous studies conducted with accelerator neutrinos. The measurement is based on high-statistics data taken by OPERA in the years 2009, 2010 and 2011. Dedicated upgrades of the CNGS timing system and of the OPERA detector, as well as a high precision geodesy campaign for the measurement of the neutrino baseline, allowed reaching comparable systematic and statistical accuracies. An early arrival time of CNGS muon neutrinos with respect to the one computed assuming the speed of light in vacuum of (60.7 \pm 6.9 (stat.) \pm 7.4 (sys.)) ns was measured. This anomaly corresponds to a relative difference of the muon neutrino velocity with respect to the speed of light (v-c)/c = (2.48 \pm 0.28 (stat.) \pm 0.30 (sys.)) \times 10-5.
An interesting site for physics teacher, provided by the American Association of Physics TeachersAmplify’d from www.compadre.orgThe Physics Front provides high quality resources for the teaching ...
(PhysOrg.com) -- Researchers at Rice University are using carbon nanotubes as the critical component of a robust terahertz polarizer that could accelerate the development of new security and communication devices, sensors and non-invasive medical imaging systems as well as fundamental studies of low-dimensional condensed matter systems.