Answer
The orbital radius is $~~0.0096~r_E$
Work Step by Step
We can find the orbital radius:
$T = \frac{2\pi~r}{v}$
$r = \frac{v~T}{2\pi}$
$r = \frac{(70~m/s)~(1500\times 24\times 3600~s)}{2\pi}$
$r = 1.44\times 10^9~m$
We can express the orbital radius in terms of the Earth's orbital radius:
$\frac{r}{r_E} = \frac{1.44\times 10^9~m}{1.50\times 10^{11}~m}$
$\frac{r}{r_E} = 0.0096$
$r = 0.0096~r_E$
The orbital radius is $~~0.0096~r_E$
