5.2 Plenary Answer

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From: Matt Baker <maba@patana.ac.th>

Subject: 5.2 Plenary Answer

Date: October 5, 2011 2:33:18 PM GMT+07:00

To: Andrew Koomenjoe Nyaga <anny14@patana.ac.th>, Arisara Amrapala <aram14@patana.ac.th>, Boondaree Chang <boch14@patana.ac.th>, Chrischawit Chomsoonthorn <chcm14@patana.ac.th>, Christopher Lo <chlo14@patana.ac.th>, Connor Blair Sailes <cosa14@patana.ac.th>, Frazer Allen Briggs <frbr14@patana.ac.th>, Huei-Yu Daniel Lo <hulo14@patana.ac.th>, Isabel Catriona McDonald <ismd14@patana.ac.th>, Kavin Supatravanij <kasu14@patana.ac.th>, Luke Michael Gebbie <luge14@patana.ac.th>, Lydia Anna Foley <lyfo14@patana.ac.th>, Morrakot Sae-Huang <mosa14@patana.ac.th>, Puchawin Borirackujarean <pubo14@patana.ac.th>, Qing Tang <qita14@patana.ac.th>, Sanyam Grewal <sagr14@patana.ac.th>, Sebastien Grimm <segr14@patana.ac.th>, Soo Hyun Lee <sole14@patana.ac.th>, Tatiksha Singh <tasi14@patana.ac.th>, Usa Wongsanguan <uswo14@patana.ac.th>, Yanida Areekul <yaar14@patana.ac.th>, Yi-Lin Huang <yihu14@patana.ac.th>

Cc: "maddog11physics@posterous.com" <maddog11physics@posterous.com>

5.2 Plenary Answer

04 October 2011

14:16

·         

If you take a piece of wood that's got a density of 2.4g/cm³and cut it exactly in half, what will the density of each of the 2 new pieces of wood be?

 

·         2.4g/cm³!

·         You've halved the mass of each block but you've also halved the volume of each block, so the ratio m/V remains contant!

·         For example…

·         ρ_{big block} = m/V = 240/100 = 2.4g/cm³

·         ρ_{small block} = m/V = 120/50 = 2.4g/cm³