Kepler's Laws — Practice Quiz

Question 1

Kepler's third law states:

Accepted Answer

T² ∝ r³

Answer

T ∝ r

Answer

T ∝ r²

Answer

T³ ∝ r²

Question 2

Mars has semi-major axis 1.524 AU. Its orbital period:

Accepted Answer

1.88 years

Answer

1 year

Answer

0.5 year

Answer

3 years

Question 3

Kepler's second law is equivalent to:

Accepted Answer

Conservation of angular momentum

Answer

Conservation of energy

Answer

Conservation of mass

Answer

Newton's third law

Question 4

A planet moves SLOWER when:

Accepted Answer

At aphelion (farthest from Sun)

Answer

At perihelion

Answer

At eclipse

Answer

At constant speed

Question 5

Kepler's laws apply to:

Accepted Answer

Any body orbiting a much heavier one (Sun-planet, planet-moon, planet-satellite)

Answer

Only the Sun-planet system

Answer

Only circular orbits

Answer

Only retrograde orbits