Physics 20 Unit C Assessment

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Jan 9, 2024

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Physics 20: Unit C Circular Motion, Work and Energy /28 At the beginning of this unit, you were given some “I can” statements and other “Questions” as part of “Questions You Should Be Able to Answer For This Unit” document. Your task for this assessment is to find an example question (from any source) that requires the information in each “Question” listed in that document. You’ll then explain how to answer each question, showing all your work, and ultimately, answer the question. You’ll be graded on each question with the following criteria: 1 point Explain how the question relates to the “Questions You Should Be Able to Answer For This Unit” question. 1 point Correct final answer for the question 2 points Relevant formula and work shown, or relevant concepts explained for how to get the answer Some questions might answer multiple “Questions” in this document. While you can use the same question more than once, you will need to re-explain how the question answers that addresses “Question” Remember, this assignment is worth 20% of your grade for this unit, so put a considerable amount of effort into this assignment.

1. Why is the acceleration of uniform circular motion directed toward the center of a circle? If a student runs at a speed of 10 m/s on a circular track of radius 240 m, what is his acceleration? R=240m V=10m/s A=? A=v^2/r A=(10m/s)^2/240m A=0.42m/s^2 The student acceleration is 0.42m/s^2. The acceleration of uniform circular motion is directed toward the center of the circle because it is necessary to continuously change the direction of the velocity vector. According to Newton's first law of motion, an object in motion will keep moving at constant speed in a straight line unless it is acted upon by an external force. We can see this in uniform circular motion, as the object moves away from the straight line and moves in a circular trajectory because of an external centripetal force acting on it. In this sample question it asks to find the centripetal acceleration of a student running on a circular track. Using the formula a = v^2/R, the acceleration can be calculated. After plugging in the values, the answer was approximately 0.42 m/s2. This sample question gives an excellent display of how the velocity and radius affect the centripetal acceleration of an object or person. Therefore, the question from the document as well as the I Can Statement are answered.

2. Using circular motion to approximate elliptical orbits, how can you describe the motion of planets, moons (natural satellites) and satellites (artificial satellites) using mathematical relationships/formula(s)? Planet Ganme has 9.00 x 104 seconds/day and 310.0 days in a year. Determine the period of the other planets (in days) from Ganme's year, using Kepler's third law. The average orbital period of Tanhe in days is… T^2=k x a^3 A=8.48x10^10m K=4.7377929 x 10^-29 T=? T=square root of k x a^3 T=square root(4.7377929 x 10^-29)(8.48x10^10m) T=169.9 T=170 days approximately The average orbital period of tanhe is 170 days. Using circular motion, we can approximate elliptical orbits and describe the motion of planets in various different ways. In elliptical orbits, planets and satellites move around another object in an oval shape or in an elliptical shape. An orbital period of a satellite or planet is the amount of time it takes it to go around the other object completely. We can find the orbital period of any object in orbit by using the formula: T^2 = k*a^3. We can also describe the motion of planets and satellites by finding their average orbital radius, which allows us to determine the shape and the path of the orbit. This question asks to find the average orbital period of one of the planets in days. To find this we can use the formula for the orbital period and we end up with an answer of approximately 170 days. This sample question allows us to connect the average orbital period with the radius and it allows us to describe how planets orbit around a main object. Therefore, the I Can Statement and the question from the document are answered.

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