Re: ZetaTalk and Spaceguard UK (D8)
In Article <3B5EFB62.49A56D5F@zetatalk.com> Nancy Lieder wrote:
> But the Moon's velosity should be:
> v = sqrt( G*M / r )
> v = sqrt( (Inverse Square) / 3.844E8) = ?
> v = sqrt( (F=M1*M2/r^2) / 3.844E8) = ?
> v = sqrt( (5.9763e+24 kg * 7.3508e+22 kg) / 3.844E8) = ?
> <============ RIGHT FORMULA FOR HIGH MASS MOON
>
> Where
> M1 = Earth = 5.9763e+24 kg
> M2 = Moon = 7.3508e+22 kg
> r = 200,000 miles = 3.844E8
> G*M = Gravity Constant of Earth = 6.67E-11 * 5.976E24
> (only valid for low-mass orbiters)
I forgot a divisor by the square of r. That line should be:
v = sqrt( ((5.9763e+24 kg * 7.3508e+22 kg)/ 3.844E8^2) / 3.844E8) = ?
<============ RIGHT FORMULA FOR HIGH MASS MOON
Sorry.