STUNTWOMAN PROBLEM

Article View: cu.physics.ugrads

Article #148

#148

From: bugnib
Date: Sun, 17 Feb 2008 22:36

24 lines
1779 bytes

I saw that there were some questions on the stuntwomen/helicopter
problem...this is how i solved it:

First, use the equation (change in y)=(Voy)(t^2) - (g/2) t^2

so we have,

33m=(12m/s) t - 9.81/2 t^2

Next, set this equation equal to zero...

4.905t^2 - 12t + 33=0

Plug this into the quadratic equation and solve for "t"...

(12 +/- square root( (-12)^2 - 4 (4.905) (3) )) / 2 (4.905)

When you solve this you get t=4.09s
Note: you also get a negative t but as we know, time cannot be
negative!

Now take 4.09s x 15 m/s = 61.4 m

Thus, the stuntwoman should place her mats 61.4 m towards the south.

Technical Details

Message-ID: <b950756b-316a-455e-81e7-5293d12f7db9@s19g2000prg.googlegroups.com>

Path: arc1-ca.pugleaf.net!g2news1.google.com!postnews.google.com!s19g2000prg.googlegroups.com!not-for-mail

Show Full Headers

Complete Article Headers

X-Google-Thread: f4cf3,dd61d5af15af5315,start
X-Google-Attributes: gidf4cf3,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: arc1-ca.pugleaf.net!g2news1.google.com!postnews.google.com!s19g2000prg.googlegroups.com!not-for-mail
From: bugnib@unlv.nevada.edu
Newsgroups: cu.physics.ugrads
Subject: STUNTWOMAN PROBLEM
Date: Sun, 17 Feb 2008 14:36:51 -0800 (PST)
Organization: http://groups.google.com
Lines: 24
Message-ID: <b950756b-316a-455e-81e7-5293d12f7db9@s19g2000prg.googlegroups.com>
NNTP-Posting-Host: 68.224.155.82
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Trace: posting.google.com 1203287812 10674 127.0.0.1 (17 Feb 2008 22:36:52 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sun, 17 Feb 2008 22:36:52 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: s19g2000prg.googlegroups.com; posting-host=68.224.155.82; 
 posting-account=txEpsAoAAABdYLzHrVujht7G_M6GrQoJ
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) 
 AppleWebKit/523.12.2 (KHTML, like Gecko) Version/3.0.4 Safari/523.12.2,gzip(gfe),gzip(gfe)