No it is not true. The second variable is the cube of the semi-major axis.
Time = distance3/2Kepler's 3rd Law of Planetary Motion gives this relationship:The cube of the average distance from the Sun is proportional to the square ofthe period of revolution (year).So: (Distance)3 is proportional to (year)2
There is a relationship between the planets distance from the sun and the time taken for one orbit (planets year), described in Keplers third law. The square root of the time taken to orbit the sun is proportional to the cube of the average distance between the sun.
An Astronomical Unit (AU) is the average distance between the Earth and the Sun.
The force of gravity is proportional to the mass of an object and inversely proportional to the square of the distance between the objects. Venus is nearer the Sun than Earth.
This is Kepler's Third Law of Planetary Motion. Let's assume the orbit is circular. The law is: The time to orbit the Sun, squared, is proportional to the distance from the Sun, cubed. Really the orbits are ellipses and we need to use the "semi-major axis" of the ellipse instead of simply the distance from the Sun.
Time = distance3/2Kepler's 3rd Law of Planetary Motion gives this relationship:The cube of the average distance from the Sun is proportional to the square ofthe period of revolution (year).So: (Distance)3 is proportional to (year)2
Not totally true.
Their masses. The strength of a planetary body's gravitational field is directly related to its mass, and its effect on an object is inversely proportional to the square of the distance between the centers of the bodies.
Newton's Law of Universal Gravitation states that the force of gravity directly proportional to product of the two masses&inversely proportional to square of the distance between them
inversely proportional
its inversely proportional to the square of the distance between objects.
"indirectly proportional" appears to be interchangeable with "inversely proportional."When a dependent variable is inversely proportional to an independent variable, that means it decreases as the dependent one increases, and vice versa. For example, a baseball player's batting average is inversely proportional to the number of at-bats. (It's directly proportional to the number of hits he gets.) In other words, as the number of at-bats increases, the player's batting average decreases. Another example is gravitational attraction between two bodies. The gravitational force between two bodies is inversely proportional to the square of the distance between them.
Mass and distance completely determine the gravitational force between two objects. The force is directly proportional to the product of their masses, and inversely proportional to the square of the distance between their centers.
The repulsive force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.
The repulsive force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.
Force of attraction between the two objects is inversely proportional to the square of distance between them.
The mutual gravitational force of attraction between two objects is proportional to the product of their masses, and inversely proportional to the square of the distance between their centers.