[DVBC] Physics question

[david c bennett]

Doug,

If you ride your recumbant to Kountry Kitchen, you can sit in for Stephen.  You'll need to rig up a communication device like Stephen's.  I nominate you to be the new DVBC science officer.

Adm. D'stre`
  ----- Original Message ----- 
  From: Doug Bower 
  To: dvbc-list at dvbc.org 
  Sent: Monday, January 22, 2007 10:07 PM
  Subject: RE: [DVBC] Physics question


  Well, Stephen may join us on our Kountry Kitchen rides but we don't have to wait for him to arrive before we eat do we? 

   

  -----Original Message-----
  From: dvbc-list-bounces at list.dvbc.org [mailto:dvbc-list-bounces at list.dvbc.org] On Behalf Of Dan Dillon
  Sent: Monday, January 22, 2007 9:01 PM
  To: dvbc-list at dvbc.org
  Subject: Re: [DVBC] Physics question

   

  We need Stephen Hawkings in DVBC...........

  ----- Original Message ----
  From: Dave Hartrum <dhartrum at mac.com>
  To: dvbc-list at dvbc.org
  Sent: Monday, January 22, 2007 8:04:54 PM
  Subject: Re: [DVBC] Physics question

  That's it. Put your cell phone in the water bottle and it won't freeze.


  Dave Hartrum
  dhartrum at mac.com



  On Jan 22, 2007, at 12:05 PM, Doug Bower wrote:

  > Dave,
  >
  > Javier is correct.  If you look at the heat transfer formula, heat
  > transfer is a function of the Delta temperature between one medium and
  > the other times the velocity of the material times the surface area of
  > the transfer area and last but not least the heat transfer of the
  > material(known as K, how well a plastic bottle transfers heat).  The
  > surface area of Bob's bottle is fixed, the delta temp is somewhat  
  > fixed
  > but the velocity between the water and air is a variable.  Basically
  > anything to increase velocity of the air or water will increase heat
  > transfer.  But this will only speed up the freezing and not affect the
  > temperature at which Bob's bottle froze.
  >
  > Dave, Stick to cell phones. :)


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