Calculate the force of gravity on the 0.60-kg mass if it were 1.3×107 m above earth's surface (that is, if it were three earth radii from earth's center).

The force of gravity is inversely proportional to the square
of the distance between the centers of the two objects that
experience the forces.

On the Earth's surface, we are 1 Earth radius from its center.
At 3 Earth radii from its center, the forces of gravity are

1 / (3²) = 1/9 (about 11%) as strong as they are on the surface.

The weight of the 0.6 kg mass is (mass) x (gravity) .

Weight = (0.6 kg) x (9.8 m/s²) x (1/9)

Weight = 0.653 Newton (about 2.35 ounces)