Re: Why can't human statue stand?

Article View: sci.physics

Article #8672

#8672

From: PD
Date: Fri, 28 Apr 2006 18:05

13 lines
1895 bytes

neo wrote:
> Suppose there is human statue of cement in standing position. We human
> being can remain in standing position. But why can't this statue remain
> standing even if it is exact like our body?

There are two types of equilibrium: stable and unstable. Both are
slope=0 points in a potential energy curve, but one curves up and the
other curves down. A standing human is better modeled with unstable
equilibrium. With periodic small corrections, an unstable equilibrium
can be maintained, but a statue cannot make those corrections.

PD

Technical Details

Message-ID: <1146247502.776126.103180@i40g2000cwc.googlegroups.com>

Path: arc1-ca.pugleaf.net!g2news2.google.com!postnews.google.com!i40g2000cwc.googlegroups.com!not-for-mail

References: <1146239949.503480.167850@e56g2000cwe.googlegroups.com>

Show Full Headers

Complete Article Headers

X-Google-Thread: 10b271,714e185f917ff4df
X-Google-Thread: 10065c,714e185f917ff4df
X-Google-Thread: 1045ed,714e185f917ff4df
X-Google-Attributes: gid10b271,gid10065c,gid1045ed,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: arc1-ca.pugleaf.net!g2news2.google.com!postnews.google.com!i40g2000cwc.googlegroups.com!not-for-mail
From: "PD" <TheDraperFamily@gmail.com>
Newsgroups: sci.physics,sci.bio.misc,bionet.neuroscience
Subject: Re: Why can't human statue stand?
Date: 28 Apr 2006 11:05:03 -0700
Organization: http://groups.google.com
Lines: 14
Message-ID: <1146247502.776126.103180@i40g2000cwc.googlegroups.com>
References: <1146239949.503480.167850@e56g2000cwe.googlegroups.com>
NNTP-Posting-Host: 12.43.229.154
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
X-Trace: posting.google.com 1146247508 9114 127.0.0.1 (28 Apr 2006 18:05:08 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Fri, 28 Apr 2006 18:05:08 +0000 (UTC)
In-Reply-To: <1146239949.503480.167850@e56g2000cwe.googlegroups.com>
User-Agent: G2/0.2
X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322),gzip(gfe),gzip(gfe)
Complaints-To: groups-abuse@google.com
Injection-Info: i40g2000cwc.googlegroups.com; posting-host=12.43.229.154;
   posting-account=rCfV9AwAAAB6GOp4HP3aWrPYi4NqdB_x

Reply to Parent Message