[rc5] The haystack... (fwd)

Chris Chiapusio chipper at llamas.net
Sun Aug 31 09:02:07 EDT 1997


a classic post for all newcommers

Chipper

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---------- Forwarded message ----------
Date: Sun, 25 May 1997 07:33:23 -0500
From: David McNett <nugget at slacker.com>
Reply-To: rc5 at llamas.net
To: "'rc5 at llamas.net'" <rc5 at llamas.net>
Subject: [rc5] The haystack...

This was blatantly copied from the DESCHALL web site, however it applies to
our effort as well...

    Assuming a single piece of hay (straw? :) is a 10cm long, .2 cm
    wide cylinder, and they're all packed fairly tightly together...

      V_haystack = (2**56) * 10cm * pi * .01cm
                 = (2**56) * .31415926
                 = 22,637,560,806,492,498 cm^3

    And given that V_sphere = 4/3 * pi * r**3... [haystacks are not
    spheres, so we'll assume it's a half-sphere by doubling the volume]

      r_haystack = 2.21km
                 = 1.37 miles

    So, we're looking for a needle in a haystack that's over 2.5 miles
    wide, and 1 mile high. Does that help? :-)




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