In this lesson, we will learn how to calculate the kinetic energy required to maintain circular orbit around a star or planet.

Q1:

The diagram shows two planets orbiting a star. Both planets have the same mass. Planet 2 orbits the star at a radius twice that of planet 1.

What is the ratio of the kinetic energy of planet 2 to that of planet 1?

Q2:

Which of the five lines on the graph correctly shows how the kinetic energy of an object in a circular orbit varies with the radius of the orbit?

Q3:

The diagram shows two planets orbiting a star. Both planets have the same kinetic energy. Planet 2 orbits the star at a radius three times that of planet 1.

What is the ratio of the mass of planet 2 to that of planet 1?

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