Re: [Phys-l] Good Questions

[Bernard Cleyet <bernardcleyet@redshift.com>]

#3 is the only question I remember from intro Physics in 1955.  It was 
not in the text, but part of a lecture.  It was a question going the 
rounds in the U of Calif. system.

Has anyone done this experiment.  I was suspicious as the appropriate 
emissivity is not in the visible.   Can this cancel the other obvious 
reason to wait?

Note this experiment:

http://www.madsci.org/posts/archives/2000-09/969405728.Ph.q.html

and:

http://www.madsci.org/posts/archives/2000-09/969405728.Ph.r.html


bc



Jeffrey Schnick wrote:

> 1) Suppose you fire a bullet from a gun, and then, using the same amount
> of gunpowder, you fire a blank from the same gun. In which case is the
> recoil greater?
>
> 2) (A former member of the College karate club asked me a question that
> has resulted in my asking this one in class.) In a karate demonstration,
> you see a person break a stout board with her bare hand. While her hand
> is in contact with the board, how does the force of her hand on the
> board compare with the force of the board on her hand?
>
> 3) (I saw one like this, many years ago in an old thermodynamics
> textbook.)  You have a mug of coffee but your coffee is too hot. You
> want to start drinking it in three minutes. You drink your coffee with
> cream. You have just the right amount of cold cream to make the beverage
> have just the right flavor. It takes you 5 seconds to mix in the cream.
> In which case would your beverage be cooler in three minutes: Wait 2
> minutes 55 seconds and then mix in the cream; or; mix in the cream right
> away and then wait 2 minutes 55 seconds.
>
> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu
> [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Cliff
> Parker
> Sent: Saturday, October 07, 2006 6:26 PM
> To: Forum for Physics Educators
> Subject: [Phys-l] Good Questions
>
>  
>
> > I am looking for good questions...
> >    
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