Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: [Phys-l] Good Questions



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...