Question

question
select the correct answer.
what does keplers second law enable us to do?
it helps us to determine the size of the planet.
it helps us to find the shape of a planets orbital path.
it helps us to deduce the orbital speed of a planet as it revolves around the sun.
it helps us to calculate the time taken by a planet to complete one cycle of day and night.

Explanation:

Kepler's second law, also known as the law of equal areas, states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. This implies that when a planet is closer to the Sun (perihelion), it moves faster, and when it is farther away (aphelion), it moves slower. So, it is related to the orbital speed of a planet around the Sun.

• The size of a planet is not related to Kepler's second law.
• The shape of a planet's orbital path (which is an ellipse) is described by Kepler's first law.
• The time taken by a planet to complete one cycle of day and night is related to the planet's rotation, not its revolution around the Sun (which Kepler's laws deal with).

Answer:

It helps us to deduce the orbital speed of a planet as it revolves around the Sun.