Question

What is the gravitational force on an object of mass 5.8 kg at the north pole of neptune? express your answer using two significant figures?

Answer 1

You need the know the following before finding the gravitational force:

Acceleration due to gravity at the North Pole of Neptune is 10.7 m/s^2

Neptune has mass of 10^(26) kg; and

Radius 25000 km

Rotates a time of about 16 hr.

So the gravitational force is computed by F = mg = 5.8 kg x 10.7N/kg ≈ 62 N