PHYS 101-B13 LUO Review Test Submission: Quiz 1 (GRADED A)

Review Test Submission: Quiz 1 User Course Fall 2020 PHYS 101-B13 LUO Test Quiz 1 Started Submitted Due Date Status Completed Attempt Score 61 out of 75 points Time Elapsed Instructions Time limit: 1 hour and 30 minutes 25 true/false and multiple-choice questions Open-book/open-notes Do not hit the BACK button as this will lock you out of the quiz. The timer will continue if you leave this quiz without submitting it. Results Displayed Submitted Answers, Feedback Question 1 2 out of 2 points Fifteen microseconds is Selected Answer: d. 0. s. Question 2 2 out of 2 points A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is Selected Answer: a. 5 m/s2. Question 3 2 out of 2 points Freely falling bodies experience Selected Answer: c. motion with constant acceleration. Question 4 2 out of 2 points The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III. The object’s velocity is negative in region(s) Selected Answer: a. III. Question 5 0 out of 2 points The figure shows the distance versus time graph of an object. The acceleration of the moving object is Selected Answer: b. increasing. Question 6 2 out of 2 points The sum of vectors A and B is Selected Answer: d. Question 7 2 out of 2 points The figure shows a distance versus time graph for an object. The velocity of the moving object is Selected Answer: a. constant. Question 8 2 out of 2 points Instantaneous speed and average speed are equal Selected Answer: c. for motion at constant speed. Question 9 0 out of 2 points A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2. The ball is referred to at the two-second time. The distance the ball is below the rooftop in meters is Selected Answer: e. none of these. Question 10 2 out of 2 points What is the proper abbreviation for ‘grams?’ Selected Answer: b. g Question 11 2 out of 2 points Which of these are fundamental physical quantities? Selected Answer: d. length, time, and mass Question 12 0 out of 2 points The figure shows a distance versus time graph for an object. The acceleration of the moving object is Selected Answer: c. not determinable. Question 13 0 out of 2 points A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2. The ball is referred to at the two-second time. The velocity of the ball in m/s is Selected Answer: e. none of these. Question 14 2 out of 2 points What is the proper abbreviation for ‘seconds?’ Selected Answer: d. s Question 15 2 out of 2 points The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III. The object’s acceleration is negative in region(s) Selected Answer: d. no regions Question 16 3 out of 3 points The period of oscillation for a signal having a frequency of 60 Hz is 60 seconds. Selected Answer: False Question 17 3 out of 3 points The proper abbreviation for ‘kilohertz’ is ‘kHz.’ Selected Answer: True Question 18 3 out of 3 points The time for one complete cycle of a periodic process to take place is called the period. Selected Answer: True Question 19 3 out of 3 points The maximum possible speed in nature is the speed of light. Selected Answer: True Question 20 0 out of 3 points A ball thrown upwards reaches a maximum height and then comes back down to the original level. At the peak of the motion the velocity and acceleration are both zero. Selected Answer: True Question 21 3 out of 3 points The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III. The object is never at rest. Selected Answer: False Question 22 0 out of 3 points The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III. The object’s acceleration is zero only in region II. Selected Answer: True Question 23 3 out of 3 points Motion in a circle at constant speed is motion with constant velocity. Selected Answer: False Question 24 3 out of 3 points An object moving in a circle undergoes centripetal acceleration. Selected Answer: True Question 25 3 out of 3 points The acceleration of a ball as it rolls down a ramp is 4 m/s2. The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest is 8 m/s. Selected Answer: True Question 26 15 out of 15 points Select the closest matching pairs possible. 3 pts for each response. Question Selected Match Velocity D. Vector quantity including displacement per time with direction. Acceleration E. Change of velocity with time Speed A. Scalar quantity including displacement per time. Centripetal Acceleration B. Acceleration of an object moving in a circular path Circular Motion C. Velocity would have a continuously changing direction