homework 6

timer Asked: Dec 21st, 2018
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Question description

From Chapter 6, we will learn about uniform circular motion and Newton's law of gravitation, including topics like angular displacement, angular velocity, centripetal acceleration, centripetal force, Newton's second law applied to uniform circular motion, fictitious forces, gravitation, satellite kinematics, and Kepler's laws. "Moving in Circles" video which will introduce the concept of circular motion.


  1. Watch the Video Lessons until you're comfortable with the material.
  2. Watch background video "Moving in Circles", available within the Lesson Plan.
    1. As you watch it, type your answers as detailed and completely as possible in the document provided within the assignment submission link.
    2. 2-3 sentences are expected for each question. Make sure you include your name.
    3. Due Date: 12/21/2018

Name: ______________________________________________________________ Moving in circles Instructions: Print the guiding questions and use them to write your answers as you read or watch the instructional media (reading, video, radio podcast, computer simulation, etc.). Type the number of the question and your answer (do not re-copy the original question) and send the completed report to Blackboard’s SafeAssign. For all questions, answer in your own words (paraphrase). Answers that are directly copied from any internet source, including the instructional media studied, will receive no credit. Moving in Circles 1. Contrast how ancient Greeks interpreted the presence of “circles in the sky” (circular motion) compared with other cultures. 2. What was an early purpose of astronomy? Why was it important? 3. In ancient times, what was a “wanderer”? Why were they called that way? What do we call “wonderers” now? 4. How mathematics define a circle? 5. In what two different ways can the position of any point in a circle be described? What branch of mathematics studies these relationships? 6. Why did Plato consider all non-circular shapes as “imperfect”? 7. Define “T” and “ω”. 8. According to Plato’s model of the universe, what was at its center? What was the last planet? What two celestial objects were considered planets at the time, but not now? 9. How many vector components a circle has? What trigonometric function is associated with each of component? 10. In the video what “saving the appearances” means? 11. What is the difference between a deferent and an epicycle? 12. What is the Almagest? Who wrote it? 13. What celestial orbit did Copernicus place in the center of his model of the universe? 14. Carefully examine the video segment between 20:20 and 20:25. For vector “r”, is it always the same size or not? In which directions it points? For vector “v”, is it always the same size or not? In which directions it points? For vector “a”, is it always the same size or not? In which direction it points?

Tutor Answer

School: UIUC




Moving in circles
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Question 1
The ancient Greeks like Plato interpreted the presence of circles in the sky or simply circular
motion as the movement of heavenly bodies such as stars and planets on their orbits round the
earth with uniform speed, uniform perfection and perfect circles while on the other hand other
cultures like ancient Persians counted the phases of the moon to act as their calendar and to be
in a position to know the appropriate time to plant and harvest their crops.
Question 2
The early purpose of astronomy was studying of phenomena that had its origin outside the
atmosphere like cosmic radiation and heavenly bodies like planets, comets, stars and galaxies.
Nevertheless, it wa...

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