Fields Practice Problems
1. A planet has a gravitational field that is uniform. The gravitational potential difference
between the surface of the planet and a point 50 m above is 20 J/kg. What would be the
work done in bringing a 3.5 kg mass from the surface to a point 20 m above the surface?
2. The escape speed on a planet with mass M and a radius r is v. What is the escape speed
of a planet of mass 2M and a radius r/2?
3. What is the electric potential at a distance of 2.2 m away from a point charge of 0.39
nC?
Answers
1. 28 J
2. 2v
3. 1.6 V