Physics

Problem

For a small spherical moon, the gravitational field strength is measured to be

0.20\,\text{N kg}^{-1}

at a height of

10\,\text{km}

above its surface and

0.05\,\text{N kg}^{-1}

30\,\text{km}

above the surface. Assuming the moon behaves as a point mass, estimate its radius. a)

20\,\text{km}

3\,\text{km}

10\,\text{km}

40\,\text{km}