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Re: [Phys-l] g...



-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Denker
Sent: Saturday, November 25, 2006 4:27 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] g...

On 11/19/2006 08:58 AM, Herb Gottlieb wrote:

According the American Institute of Physics Handbook, Page 2-93,
the acceleration of gravity is given as 9.78 at sea level at the
earth's equator.

OK, but that's not the whole story.

... New York City
(Where the acceleration of gravity is not 9.81 N/kg)

Actually in NYC the acceleration of gravity is 9.8023(5) m/s^2.

Hint: There is a nifty formula to be found at
http://www.npl.co.uk/mass/faqs/gravity.html


I like the calculator at
http://www.ngs.noaa.gov/cgi-bin/grav_pdx.prl
You can get the coordinates and elevation you need to plug into that
calculator from
http://www.topozone.com

The on-line calculator yields 9.80256(2) m/s^2 for the point at
40.783 degrees N, 73.967 degrees W, 90 ft above sea level
identified as "Manhattan (subdivision)" in:
http://www.topozone.com/states/NewYork.asp?county=New+York

Jeff Schnick