[meteorite-list] Fake Norway rock
From: Jim Wooddell <jim.wooddell_at_meteoritecentral.com>
Date: Thu, 10 Apr 2014 04:38:14 -0700
What I find interesting are the comments made on such things at
trajectory of the object. As the camera is falling, it is not falling
vertically. It is falling at a rate of about 1000 ft per second and
gliding too. Because the camera was mounted on the helmet, it's view is
whatever way the guy was facing.
So, if you take an object, like a baseball and hang it from a string 30
feet in the air and then step back 40' and take a picture of it while
standing on a 10 foot ladder, it's going to look small.
Then if you take the ladder move it 10 feet closer to the ball and lower
the ball from 30 feet to 25 feet and then climb the ladder but take the
picture at 3/4 the height of the first picture, you will see the ball is
bigger and the angle will be different making it look like it is moving
on some arc or curve (in a composite of the two pictures), when all it
did was drop vertically. You keep doing that and pretty soon you and
the ball will meet and the ball will look bigger than it actually is.
So the ball, with a perfectly vertical decent, will not appear to have a
vertical decent. One can actually just draw this out with a pencil and
paper without the need for a camera!
-- Jim Wooddell jim.wooddell at suddenlink.net http://pages.suddenlink.net/chondrule/Received on Thu 10 Apr 2014 07:38:14 AM PDT