M7 Phys Gravitation

Kepler's first law states that

• the orbits of the planets are elliptical.

• the speed of a planet's orbit varies depending on which part of the ellipse it is occupying

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun.

• objects attract other objects with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.

Kepler's second law states that

• the orbits of the planets are elliptical.

• the speed of a planet's orbit varies depending on which part of the ellipse it is occupying

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun.

• objects attract other objects with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.

Kepler's third law states that

• the orbits of the planets are elliptical.

• the speed of a planet's orbit varies depending on which part of the ellipse it is occupying

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun.

• objects attract other objects with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.

Newton's law of universal gravitation states that

• the orbits of the planets are elliptical.

• the speed of a planet's orbit varies depending on which part of the ellipse it is occupying

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun.

• objects attract other objects with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.

Gravity is what type of force?

• field force

• contact force

• normal force

• frictional force

A black hole is

• an object so diffuse that light leaving it is bent totally back to center of the universe.

• an object so diffuse that light approaching it is blocked from view.

• an object so massive that light leaving it is bent totally back to the nearest star.

• an object so massive that light leaving it is bent totally back to the object