# What is kepler’s second law

## What is Kepler’s 2nd law?

Kepler’s second law states that a planet moves in its ellipse so that the line between it and the Sun placed at a focus sweeps out equal areas in equal times.

## What are Kepler’s 3 laws in simple terms?

There are actually three, Kepler’s laws that is, of planetary motion: 1) every planet’s orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet’s orbital period is proportional to the cube of the semi-major axis of its …

## What is Kepler’s first and second law?

SATELLITE ORBITS

Satellites move around the earth as planets do around the sun. Kepler’s laws apply: First Law: Planetary orbits are elliptical with the sun at a focus. Second Law: The radius vector from the sun to a planet sweeps equal areas in equal times.

## Why is Kepler’s second law important?

Kepler’s Second Law is valuable because it gives a quantitative statement about how fast the object will be moving at any point in its orbit. Note that when the planet is closest to the Sun, at perihelion, Kepler’s Second Law says that it will be moving the fastest.

## What is Kepler’s third law formula?

If the size of the orbit (a) is expressed in astronomical units (1 AU equals the average distance between the Earth and Sun) and the period (P) is measured in years, then Kepler’s Third Law says P2 = a3. where P is in Earth years, a is in AU and M is the mass of the central object in units of the mass of the Sun.

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## What is the formula for Kepler’s 2nd law?

“Equal areas in equal times” means the rate at which area is swept out on the orbit (dA/dt) is constant. So Kepler’s Second Law Revised: The rate at which a planet sweeps out area on its orbit is equal to one-half its angular momentum divided by its mass (the specific angular momentum).

## Why is Kepler’s 3rd law important?

Kepler’s third law of planetary motion says that the average distance of a planet from the Sun cubed is directly proportional to the orbital period squared. … Kepler found this law worked for the planets because they all orbit the same star (the Sun).

## What is G in Kepler’s third law?

The Newtonian constant, G, is defined in terms of the force between two two masses separated by some fixed distance. In order to measure k, all you need to do is count days; in order to measure G, you need to know very precisely the masses, separation, and forces between test objects in a laboratory.

## What does Kepler’s law mean?

1 : a statement in astronomy: the orbit of each planet is an ellipse that has the sun at one focus. 2 : a statement in astronomy: the radius vector from the sun to each planet generates equal orbital areas in equal times.

## What is the second law of planetary motion called?

7-day free trial. Login. Kepler’s second law of planetary motion describes the speed of a planet traveling in an elliptical orbit around the sun. It states that a line between the sun and the planet sweeps equal areas in equal times.