Week 5 Quiz_ PHYS180A-1001_Fundamentals of Physics

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San Diego State University *

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180A

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Mathematics

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Feb 20, 2024

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pdf

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10/11/23, 12:24 PM Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics https://sdsu.instructure.com/courses/137053/quizzes/272009 1/5 Week 5 Quiz Due Sep 22 at 1:50pm Points 50 Questions 8 Available Sep 22 at 1pm - Sep 22 at 3pm 2 hours Time Limit 50 Minutes Instructions This quiz was locked Sep 22 at 3pm. Attempt History Attempt Time Score LATEST Attempt 1 10 minutes 42 out of 50 Score for this quiz: 42 out of 50 Submitted Sep 22 at 1:11pm This attempt took 10 minutes. This is an open-book open-note quiz based on Week 5 Homework (https://sdsu.instructure.com/courses/137053/modules/items/3316671) . The time limit is 50 minutes. This weekly quiz is meant to be a self-evaluation tool to check well the whole week's material has been mastered, and get prepared for the Unit Test 2. Correct answers will be available after 3pm . You may come to the office hour Friday 8-9pm to request a second chance to retake this quiz over the weekend. 25 / 25 pts Question 1 Have you completed Week 5 Homework? Yes Correct! Correct! No
10/11/23, 12:24 PM Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics https://sdsu.instructure.com/courses/137053/quizzes/272009 2/5 3 / 3 pts Question 2 Answer 1: A cleaner pushes a 6.55-kg laundry cart in such a way that the net external force on it is 30.0 N. The magnitude of its acceleration is 4.58 m/s . (Keep three significant figures for all the answers) 2 4.58 Correct! Correct! 3 / 3 pts Question 3 Answer 1: A 57.0-kg sprinter starts a race with an acceleration of 3.60 m/s . The net external force on him is 205 N. (Keep three significant figures for all the answers) 2 205 Correct! Correct! 0 / 3 pts Question 4 Answer 1: Consider a rocket sled (mass 2.40×10 kg) starts with one rocket burning (the thrust T is 3.00×10 N). The force of friction opposing the motion is known to be 705 N. The magnitude of its acceleration is 12.4 m/s . (Keep three significant figures for all the answers) 3 4 2
10/11/23, 12:24 PM Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics https://sdsu.instructure.com/courses/137053/quizzes/272009 3/5 12.4 ou Answered ou Answered 12.2 orrect Answer orrect Answer 3 / 3 pts Question 5 What force does a trampoline have to apply to a 45.0-kg gymnast to accelerate her straight up at 7.00 m/s ? (in the unit of N) (Keep three significant figures for all the answers) 2 315N Correct! Correct! orrect Answers orrect Answers 315 315 N 315N 4 / 4 pts Question 6 Answer 1: Answer 2: Suppose a 54.0-kg gymnast climbs a rope. g = 9.80 m/s . If the gymnast climbs at a constant speed, the tension in the rope is 529 N. If the gymnast climbs with an upward acceleration of 2.00 m/s , the tension in the rope is 637 N. (Keep three significant figures for all the answers) 2 2 529 Correct! Correct! 637 Correct! Correct!
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