Answers DISD CR Physics 2020-2021Universal Law of Gravitation

Earth-Moon-Sun System Answers

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If it takes a planet 2.8 × 108 s to orbit a star with a mass of 6.2 × 1030 kg, what is the average distance between the planet and the star?

1.43 × 109 m

9.36 × 1011 m

5.42 × 1013 m

9.06 × 1017 m

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The table shows information about two of the major moons of Uranus.MoonOrbital Period (days)Average Distance from Uranus (km)Miranda0.319129,390Titania 8.71435,910What is the average distance between Miranda and Uranus?

2.84 × 104 km

1.29 × 105 km

1.47 × 106 km

4.65 × 107 km

The mass of the Sun is 2 × 1030 kg, and the distance between Neptune and the Sun is 30 AU. What is the orbital period of Neptune in Earth years?

30 Earth years

164 Earth years

3.8 × 1011 Earth years

2.3 × 1017 Earth years

The mass of the Sun is 2 × 1030 kg, and the mass of Saturn is 5.68 × 1026 kg. The distance between Saturn and the Sun is 9.58 AU. Veronica is solving the following equation to calculate the orbital period of Saturn, but there is an error in the equation.T = What should Veronica change to correct the equation?

change the position of 2 x 1030 kg and 9.58 AU

change 2 x 1030 kg to 5.68 x 1026 kg

change the square root to a cube root

change 9.58 AU to the distance in meters

The image shows how Earth orbits the Sun. Points W and X are the same distance from the Sun.

Earth is speeding up at W and slowing down at X because the force on Earth is greater at W than at X.

Earth is slowing down at W and speeding up at X because the force on Earth is greater at W than at X.

The speed of Earth is the same at W as at X because the force on Earth is the same at W as at X.

The speed of Earth is greater at W than at X because the force on Earth is greater at W than at X.

The image shows Earth’s orbit around the Sun.

The speed increases from W to X because a component of the gravitational force acts in the direction opposite to the velocity.

The speed increases from W to X because a component of the gravitational force acts in the direction of the velocity.

The speed increases from X to W because a component of the gravitational force acts in the direction opposite to the velocity.

The speed increases from X to W because a component of the gravitational force acts in the direction of the velocity.

The table shows information about the moons of Mars.MoonOrbital Period (days)Average Distance from Mars (km)Phobos0.3199378Deimos 23,459What is the orbital period of Deimos?

0.0806 days

0.798 days

1.26 days

1.59 days

Dewayne reviews Kepler’s laws by making the table shown. Which label belongs in each cell of the table?

W: FirstX: SecondY: Third

W: ThirdX: SecondY: First

W: ThirdX: FirstY: Second

W: SecondX: ThirdY: First

Which best describes how Johannes Kepler developed his laws of planetary motion?

He calculated the gravitational force on orbiting bodies.

He debated with Copernicus who proposed the heliocentric model.

He examined the motions of planets through a telescope.

He analyzed data collected by Tycho Brahe.

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Earth-Moon-Sun System Answers

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