Keplers Laws

What is the difference between a circle and an ellipse in terms of eccentricity?

• A circle has an eccentricity of 1, while an ellipse has an eccentricity of 0.

• A circle has an eccentricity of 0, while an ellipse has an eccentricity between 0 and 1.

• A circle has an eccentricity of 0.5, while an ellipse has an eccentricity of 1.

• A circle has an eccentricity of 0, while an ellipse has an eccentricity of 2.

What is the shape of the orbits of planets according to Kepler's First Law?

• Circular

• Elliptical

• Parabolic

• Hyperbolic

What is Kepler's First Law?

• Planets move in circular orbits with the Sun at the center.

• Planets move in elliptical orbits with the Sun at one focus.

• Planets move in parabolic orbits with the Sun at one focus.

• Planets move in hyperbolic orbits with the Sun at the center.

What is Kepler's Second Law?

• A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.

• The orbit of a planet is an ellipse with the Sun at one of the foci.

• The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

• A planet moves faster when it is closer to the Sun and slower when it is farther from the Sun.

How does the speed of a planet change in its orbit according to Kepler's laws?

• A planet moves at a constant speed regardless of its distance from the Sun.

• A planet moves faster when it is closer to the Sun and slower when it is farther from the Sun.

• A planet moves slower when it is closer to the Sun and faster when it is farther from the Sun.

• A planet's speed is unaffected by its distance from the Sun.

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

• It is the shortest diameter of the ellipse.

• It determines the shape of the ellipse.

• It is half the longest diameter of the ellipse and determines the size of the orbit.

• It is the distance from the center to a focus of the ellipse.

What is Kepler's Third Law?

• The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

• The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

• The speed of a planet in its orbit is constant regardless of its distance from the sun.

• The orbits of planets are perfect circles around the sun.

What does an eccentricity of 1 indicate?

• A circular trajectory

• An elliptical trajectory

• A parabolic trajectory

• A hyperbolic trajectory

What is eccentricity in the context of orbits?

• Eccentricity is a measure of how much an orbit deviates from being circular.

• Eccentricity refers to the speed of an orbiting body.

• Eccentricity is the distance between the foci of an ellipse.

• Eccentricity indicates the mass of the orbiting object.

What is the focus of an ellipse?

• A focus is one of the two fixed points in an ellipse used to define its shape.

• A focus is the center point of the ellipse.

• A focus is the distance from the center to the edge of the ellipse.

• A focus is a line segment that connects the two foci of the ellipse.