I wrote: "Gravitational charge has the dimension of gravitational
mass, e.g. kg_g. When it is clear you are talking about
gravitational mass and not inertial mass you can simply dispense with
the "sub g"."
I should have noted here that kg_g = i kg. In other words,
gravitational charge is an imaginary number. It is important to keep
track of the i in computations when force direction is an issue.
There are some good examples of the use of i in computations in:
http://www.mtaonline.net/~hheffner/GraviCalcs.pdf
Regards,
Horace Heffner
