A satellite orbiting Earth at an orbital radius r has a velocity v. Which represents the velocity if the satellite is moved to an orbital radius of 4r?
1/2 v
Why was the geocentric model of the solar system accepted by scientists for many years? Select the two correct answers.
suitable technology wasn't available to disprove the model, the model accurately predicted the movements of the planets
The Copernican model of the solar system was a HELIOCENTRIC MODEL in which Earth WAS JUST ANOTHER PLANET. Planets TRAVELLED ALONG A CIRCULAR PATH, and the stars WERE FIXED TO AN OUTERMOST SPHERE.
Which of the following is the best definition of Newton's theory of universal gravitation?
Every object attracts every other object in the universe, with a force that increases as the objects' masses increase and the distance between them decreases.
Which statement summarizes Kepler's First Law of Planetary Motion?
Planets revolve around the sun in elliptical orbits.
Which of these can happen to objects in the solar system that do not have the momentum to maintain a stable orbit around the sun? Select the two correct answers.
They can spiral into the sun, They can swing around the sun and be ejected outward into space.
Where is the sun located on Earth’s elliptical orbit?
at a focus
For a planet orbiting the sun, rp is the distance from the sun to the perihelion and ra is the distance from the sun to the aphelion. What is a planet’s orbital eccentricity if rp is equal to 0.45ra?
0.38
Which statements about geocentric model and heliocentric model are true? Select the two correct answers.
They are both models of the solar system, They both show the position of Earth relative to the Sun.
How does Kepler’s third law compare the periods and orbital radii of two planets within a solar system?
The square of the ratio of the periods equals the cube of the ratio of the radii.
Which statement describes the area swept out by a line between a planet and the sun at equal times as the planet moves along its orbit?
It changes shape but always remains constant.
hope this helps, good luck :)