Which statement describes Kepler’s third law of orbital motion?(1 point)
Responses
The cube of orbital period is proportional to the square of the semi-major axis.
The cube of orbital period is proportional to the square of the semi-major axis.
The square of orbital period is proportional to the semi-major axis.
The square of orbital period is proportional to the semi-major axis.
The square of orbital period is proportional to the cube of the semi-major axis.
The square of orbital period is proportional to the cube of the semi-major axis.
The orbital period is proportional to the square of the semi-major axis.
The cube of orbital period is proportional to the square of the semi-major axis.
Which is the best description of Earth’s orbit?(1 point)
Responses
highly elliptical
highly elliptical
circular
circular
parabolic
parabolic
almost circular
almost circular
Which planet’s orbit was Kepler first studying when he began to develop his laws of orbital motion?(1 point)
Responses
Mars
Mars
Saturn
Saturn
Earth
Earth
Jupiter
Mars
Which of these describes Kepler’s third law of orbital motion?(1 point)
Responses
T2∝a
T2∝a
T2 ∝ a3
T2 ∝ a3
T∝a2
T∝a2
T3 ∝a2
T2∝a3
Which orbital shape did most scientists in the early 1600s think the planets of our solar system have?(1 point)
Responses
hyperbolic
hyperbolic
parabolic
parabolic
elliptical
elliptical
circular