Which planet’s orbit was Kepler first studying when he began to develop his laws of orbital motion?(1 point)
Responses
Jupiter
Which orbital shape did most scientists in the early 1600s think the planets of our solar system have?(1 point)
Most scientists in the early 1600s thought that the planets of our solar system have circular orbits.
Which of these describes Kepler’s third law of orbital motion?(1 point)
Responses
T∝a2T∝a2
T3 ∝a2T3 ∝a2
T2 ∝ a3 T2 ∝ a3
T2∝a
The correct answer is: T2 ∝ a3
Which is the best description of Earth’s orbit?(1 point)
Responses
The best description of Earth's orbit is roughly elliptical, with the Sun at one of the foci.
parabolic
parabolic
circular
circular
almost circular
almost circular
highly elliptical
The correct answer is: almost circular
Which statement describes Kepler’s third law of orbital motion?(1 point)
Responses
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 orbital period is proportional to the square 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.
The cube of orbital period is proportional to the square of 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.
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