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am beginning to love this guy! truly inspiring! #nickvujicic with #novak #djokovic and #bethanyhamilton #soulsurfer #picstitch
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am beginning to love this guy! truly inspiring! #nickvujicic with #novak #djokovic and #bethanyhamilton #soulsurfer #picstitch
(Source: nerdlosergirl, via likeaphysicist)
An oscillating pendulum, with velocity and acceleration marked. It experiences both tangential and centripetal acceleration.
(via likeaphysicist)
When you plot the position of Mars in the sky, you’ll notice that in general it moves from West to East. But when we are closest to Mars, it seems to go backwards for a bit before continuing. This is called retrograde motion, and this challenged early models of the Solar system which had Earth at the centre. The animation shows why Mars appears to go backwards for a bit. [more] [code]
(via likeaphysicist)