Gravitation and Its Applications

What is the distance above the Earth's surface where the gravitational field strength is one-third of its surface value?

• 11,085 km

• 6,400 km

• 4,700 km

• 3,200 km

How is gravitational field strength related to the distance from the center of the Earth?

• Directly proportional to the square of the distance

• Inversely proportional to the distance

• Directly proportional to the distance

• Inversely proportional to the square of the distance

What does the area under a graph of gravitational field strength against distance represent?

• Kinetic energy

• Work done

• Gravitational potential

• Gravitational force

What is the significance of the gravitational potential in the context of gravitational field strength?

• It is the potential energy of a mass

• It is the energy required to move a mass

• It is the work done per unit mass

• It represents the force per unit mass

If the Earth's radius expands by a factor of seven, what is the ratio of the new gravitational field strength to the old one?

• 1/7

• 1/14

• 1/49

• 1/21