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## Re: Question

 Subject: Re: Question Chris L Peterson Tue, 23 Aug 2005 04:06:23 GMT sci.astro.amateur
 ```On Mon, 22 Aug 2005 20:07:48 -0700, "Starlord" wrote: >Ok, below is a question sent to me from one of the members of the SIAR: > >"I have a small quandary. I've assigned my students to look up >some basic info on the planets via the web. Then I tried to create >the answer key, and found VERY contradictory info regarding >Mercury from assorted, reputable sources. It seems that online >info indicates Mercury's surface gravity is 0.28 G, 0.33 G, or >0.38 G (virtually identical to Mars). > >Do you have some info on this? Is there a solid, definitive answer?" > >What you all say? Lang gives a value of 3.7 m/s^2, or 0.38G. You can test this, using A = Mp / Rp^2 * Ae (Mp, Rp are mass and radius relative to Earth, Ae is Earth's gravity) A = 0.05527 / 0.382^2 * 9.8 m/s^2 = 3.71 m/s^2 = 0.38G _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com ```
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