quizgravitation_ General Physics_ 2023SU-PHYS-004A-101

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 1/10 * Some questions not yet graded quizgravitation Due Aug 2 at 11:59pm Points 33 Questions 16 Available Jun 19 at 12am - Aug 2 at 11:59pm Time Limit 50 Minutes Allowed Attempts 2 Instructions Attempt History Attempt Time Score LATEST Attempt 1 47 minutes 30 out of 33 * Score for this attempt: 30 out of 33 * Submitted Aug 2 at 2:06am This attempt took 47 minutes. 2 attempts 50 mins Take the Quiz Again 1 / 1 pts Question 1 The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 2/10 its speed is constant. its speed is increasing. its speed is decreasing. Correct! Correct! its speed is a maximum. its speed is a minimum. 3 / 3 pts Question 2 Suppose the gravitational force of the Earth on a body was . What escape velocity v would a body need to escape the gravitational field of the Earth? e . . Correct! Correct! . . . 3 / 3 pts Question 3 What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 10 m, mass = 6.0 × 10 kg) with a period of 5.0 h? 6 24 88 N

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 4/10 its speed is constant. its speed is increasing. its speed is decreasing. its speed is a maximum. its speed is a minimum. Correct! Correct! 3 / 3 pts Question 6 Exhibit 7-1 Three 5.0-kg masses are located at points in the xy plane as shown in the figure. Use this exhibit to answer the following question(s). Refer to Exhibit 7-1. What is the magnitude of the resultant force (caused by the other two masses) on the mass at x = 0.40 m, y = 0?

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 5/10 2.2 × 10 N − 8 1.9 × 10 N − 8 1.4 × 10 N − 8 1.6 × 10 N Correct! Correct! − 8 2.5 × 10 N − 8 2 / 2 pts Question 7 Three galaxies, each of mass m = 4.0 × 10 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 10 m length. The magnitude of the force the other two galaxies exert on each galaxy is 41 22 4.3 × 10 N. 27 6.4 × 10 N. 27 7.4 × 10 N. Correct! Correct! 27 8.6 × 10 N. 27 4.3 × 10 N. 28 3 / 3 pts Question 8 Planet Zero has a mass of 5.0 × 10 kg and a radius of 2.0 × 10 m. A space probe is launched vertically from the surface of Zero with an initial speed of 4.0 km/s. What is the speed of the probe when it is 3.0 × 10 m from Zero's center? 23 6 6 3.0 km/s

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 7/10 2.0 × 10 J 10 2.5 × 10 J 9 2 / 2 pts Question 11 The period of a satellite circling planet Nutron is observed to be 84 s when it is in a circular orbit with a radius of 8.0 × 10 m. What is the mass of planet Nutron? 6 6.2 × 10 kg 28 5.0 × 10 kg 28 5.5 × 10 kg 28 4.3 × 10 kg Correct! Correct! 28 3.7 × 10 kg 28 1 / 1 pts Question 12 Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny a system where mass m is r (not the Earth's radius) distant from Earth and r (not planet P's radius) distant from planet P, the mass being on the line connecting the Earth and planet P. Carla states that the mass m has escaped if F = − F . Jenny disagrees. Which one, if either, is correct, and why? E P P on m E on m Carla, because the total gravitational force on m is zero at that point. Carla, because there is no gravitational force from Earth on m at that point. Carla, because there is no gravitational force on m from Earth when r > r . E

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 8/10 Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth. Correct! Correct! Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth. 2 / 2 pts Question 13 A 50-kg satellite circles planet Cruton every 5.6 h in an orbit with a radius of 12 × 10 m. What is the magnitude of the gravitational force on the satellite by planet Cruton? 6 63 N 58 N Correct! Correct! 68 N 73 N 50 N Not yet graded / 3 pts Question 14 Your Answer: Calculate the Earth's angular momentum in the approximation that treats the Earth's orbit around the Sun as a circle. ( M = 1.99 × 10 kg; T = 3.156 × 10 s; M = 5.98 × 10 kg.) Sun 30 7 E 24 2.66x10^40

8/2/23, 2:07 AM quizgravitation: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244107 10/10 Quiz Score: 30 out of 33