🚀 go-pugleaf

G = 6.67 x 10^-11, not 5 x 10^-11 or are you using different units for
mass and/or radius?  I still have not answered your question.  I think the
mass was initially determined by timing the moon(s) of Mars and knowing
their mean radius of orbit, the mass was determined.

Lowell

On Tue, 28 Feb 1995, Sandeep Casi wrote:

> Hi,
>     I have a question on Newton Universal Gravity. According to the
>     formula  g=GM(Mass of Earth) / Radius of the earth. In this formula
>     we know that g=9.81 m/s^2 and the value G=(5 x 10^-11) and the
>     radius of the earth is approx 6380 Kilometers, so we can compute and
>     get the mass of the earth as approx (5 x 10^24 Kg). To calculate the
>     mass of earth we had three knowns and one unknown, but let's say I
>     want to calculate the mass of the planet Mars. In this case I only
>     have two knowns (G=5 x 10^-11, and the radius of Mars -> Which I am
>     not sure how to obtain, but probably can get the data from an
>     astronomy book), So in this case how can I compute the gravity g in
>     Mars and the Mass of the planet Mars. Thanks in Advance.
>
> You Can Email to the following addr -> scasi01@eng.eds.com