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Re: [Phys-l] Torque, angular momentum, dissipation, etc. in an advert.



The links did not come through.

Ken Fox

On Sun, Feb 21, 2010 at 1:25 PM, Bernard Cleyet
<bernardcleyet@redshift.com>wrote:

The following advert, tho well done and exhibits physical principles, is
also very misleading, and, therefore, perhaps harmful if not accompanied by
a discussion. It's currently being praised by members of a HS physics
list, who will class room use it.


Here's the link:

YouTube - Record

Also posted here:


The Blog of Phyz


Am I wrong? I calc. the I (orJ) to be about five million kg m^2
[assuming the skater is two meter tall the ice disk has a radius of fifteen
m and is > 0.05 m thick. Two inch ice will not support a walking person --
the skater is more than walking!] Also the dissipation must be enormous!


Near the end the disclaimer: "Screen images simulated"** is in very small
type -- I didn't see it until the fourth viewing and no poster has mentioned
it -- one suggest it might be "real"; the others haven't commented.


** May refer to only the 'phone's image.

bc




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