# Based on the second law of planetary motion, when would a planet travel fastest in its orbit?

## What does Kepler’s 2nd Law of planetary motion state?

Kepler’s second law states that a planet sweeps out equal areas in equal times, that is, the area divided by time, called the areal velocity, is constant.

perihelion

## What is the proper law of planetary motion?

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 …

## Which scientist determine the nature of the forces that keep the planets in their orbits?

Kepler’s Laws of Planetary Motion

While Copernicus rightly observed that the planets revolve around the Sun, it was Kepler who correctly defined their orbits. At the age of 27, Kepler became the assistant of a wealthy astronomer, Tycho Brahe, who asked him to define the orbit of Mars.

## What is Kepler’s 2nd law called?

Kepler’s Second Law, or The Law of Equal Areas in Equal Time — The line between a planet and the sun sweeps out equal areas in the plane of the planet’s orbit over equal times. … It is often called the Law of Harmony because it shows a harmonic relation between distances and periods.

## 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.

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## Where in the orbit is the planet the slowest?

A planet moves with constantly changing speed as it moves about its orbit. The fastest a planet moves is at perihelion (closest) and the slowest is at aphelion (farthest). Law 3. The square of the total time period (T) of the orbit is proportional to the cube of the average distance of the planet to the Sun (R).

## Which planet has the slowest orbit around the sun?

By dividing the distance traveled in one full orbital cycle by the orbital time, you can derive the orbital speed. If Pluto had maintained its planet status, it would have the slowest orbital speed at just 10,438 miles per hour. Instead, Neptune again wins with an orbital speed of 12,148 miles per hour.

## At which position would the planet have been traveling the fastest the slowest?

The planet would move fastest when it is closest to the Sun (at perihelion) and slowest when farthest from the Sun (at aphelion).

## 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.

## What is the first law of planetary motion?

Kepler’s first law – sometimes referred to as the law of ellipses – explains that planets are orbiting the sun in a path described as an ellipse. … The resulting shape will be an ellipse. An ellipse is a special curve in which the sum of the distances from every point on the curve to two other points is a constant.

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## What is theory of planetary motion?

Three laws devised by Johannes Kepler to define the mechanics of planetary motion. The first law states that planets move in an elliptical orbit, with the Sun being one focus of the ellipse. This law identifies that the distance between the Sun and Earth is constantly changing as the Earth goes around its orbit.

## When did Heliocentrism become accepted?

While the sphericity of the Earth was widely recognized in Greco-Roman astronomy from at least the 4th century BC, the Earth’s daily rotation and yearly orbit around the Sun was never universally accepted until the Copernican Revolution.

## Is geocentric model correct?

* Ptolemy develops a geocentric model that has the planets moving around the Earth. … His model has the planets moving around the Sun in circular orbits. This can explain retrograde motion, but his model doesn’t fit all the planetary position data that well. Really, it’s no better than Ptolemy’s geocentric model.