Kepler's 1st Law of Planetary Motion

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What is Kepler's 1st Law of Planetary Motion?

Back

Kepler's 1st Law states that planets move in elliptical orbits with the Sun at one of the foci.

Front

What is eccentricity in the context of orbits?

Back

Eccentricity is a measure of how much an orbit deviates from being circular. It ranges from 0 (circle) to 1 (parabola).

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What does an eccentricity of 0 indicate?

Back

An eccentricity of 0 indicates a perfect circular orbit.

Front

What does an eccentricity close to 1 indicate?

Back

An eccentricity close to 1 indicates a highly elongated elliptical orbit.

Front

How does the distance between the foci relate to eccentricity?

Back

As the distance between the foci increases, the eccentricity of the ellipse increases.

Front

What is the formula for calculating eccentricity (e) of an ellipse?

Back

e = c/a, where c is the distance from the center to a focus, and a is the distance from the center to a vertex.

Front

If the distance between the foci is 6 cm and the length of the major axis is 10 cm, what is the eccentricity?

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Eccentricity (e) = 0.6.

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How does Mercury's eccentricity compare to Venus' eccentricity?

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Mercury has a higher eccentricity (0.206) than Venus (0.007), meaning Mercury's orbit is more elongated.

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What is the significance of the major axis in an ellipse?

Back

The major axis is the longest diameter of the ellipse, passing through both foci.

Front

What is the significance of the minor axis in an ellipse?

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The minor axis is the shortest diameter of the ellipse, perpendicular to the major axis.