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 3r?(1 point)
I have trouble understanding it can someone teach this and explain please.
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 5r?
15√v answer*********
15v
5√v
5v
Which form of Kepler’s third law can you use to relate the period T and radius r of a planet in our solar system as long as the unit year is used for the period and astronomical unit is used for the radius?
T=r2
T2=r
T3=r
T2=r3 answer******
Which are features of Copernicus's model of the solar system? Select the three correct answers
The stars are fixed to an outer sphere. answer *****
The planets move in perfect circles. answer*****
Earth is fixed to a crystalline sphere.
The outer planets move in epicycles.
The Sun is at the center. answer*****
A line between a planet and the sun sweeps out two equal areas at different places as it moves along its orbit. Which factor remains constant as this happens?
the distance the planet moves along its orbit while it sweeps out the area.
the planet’s speed as it sweeps out the areas.
the time required to sweep out the areas. answer******
the distance from the sun to the planet while it sweeps out the areas.
Which did Kepler notice about planetary motion that caused him to propose Kepler’s first law of orbital motion?
The distance to the sun varies. answer ************
Most planets have highly elliptical orbits.
The distance between Mars and the sun is constant.
The planets have circular orbits.
What shape is the moon's orbit around Earth?
an ellipse that is almost circular. answer********
a circle.
a spiral.
an ellipse that is elongated.
Which of the following statements about Newton's theory of universal gravitation are true? Select the three correct answers
Gravitational force increases as mass of objects decreases.
Gravitational force increases as the mass of objects increases. answer ***
The theory applies to all objects in the universe. answer****
The theory applies only to objects on Earth.
Gravitational force increases as the distance between objects decreases. answer**
Gravitational force increases as the distance between objects increases.
In 3-5 sentences, analyze why Aristotle's and Ptolemy's models were accepted for more than a thousand years in spite of being completely incorrect. In your answer, use the term geocentric?
Aristotle and Ptolemy's geocentric models of the solar system were accepted for more than a thousand years in spite of being completely incorrect. This was because it was a major contribution then, and at the time people really didn't know any better.
The mass of an object doubles. What happens to the gravitational force between it and another object whose mass stays the same, assuming they remain the same distance apart?
The amount of the gravitational force decreases by one-half.
The amount of the gravitational force doubles. answer *****
The amount of the gravitational force quadruples.
The amount of the gravitational force remains the same.
Based on Kepler's observations about planetary motion, what is the relationship between a planet's orbital velocity and its distance from the sun?
As distance is cut in half, orbital velocity decreases.
The greater the distance, the greater the orbital velocity.
Distance has no effect on orbital velocity.
The greater the distance, the slower the orbital velocity. answer****
For a moon orbiting its planet, rp is the shortest distance between the moon and its planet and ra is the longest distance between the moon and its planet. What is a moon's orbital eccentricity if rp is equal to 0.27ra?
0.48
0.57answer ***
0.27
0.65
An asteroid approaches Jupiter and is slung around into a new trajectory across the solar system. Which of the following are possible? Select the three correct answer?
The asteroid spirals into the sun. answer**
The asteroid enters a stable elliptical orbit around the sun. answer***
The asteroid falls into an irregular orbit around Jupiter.
The asteroid adopts an unusual orbit around the sun, such as an egg shape.
The asteroid slows down as it passes around Jupiter.
The asteroid continues out of the solar system. answer ***
In 3–5 sentences, explain how the shape of planetary orbits affects their orbital velocity. Include the proper law of planetary motion as part of your answer?
A planet's orbital speed changes, depending on how far it is from the Sun. The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun's gravitational pull, and the slower it moves in its orbit
In 3-5 sentences, describe how Copernicus developed his model of the solar system. In your answer, include an explanation for why his model was, or was not, readily accepted at the time?
In 1514, Copernicus distributed a handwritten book to his friends that set out his view of the universe. In it, he proposed that the center of the universe was not Earth, but that the sun lay near it.
Which statements about the geocentric model are false? Select the two correct answers?
It explains why Mars appears to move backward for a few months approximately every two years. answer**
It shows the Sun at the center of the solar system. answer*****
It shows Earth at the center of the solar system.
It shows the orbits of the planets as circular.
i wish this help 100% also i got 3/15 but it's ok u guys helped me lot so that my turn 🙂🙂🙂