PHYS220_202030_Prelim1_ 01B-Spring 2023-Mechanics

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Ivy Tech Community College, Indianapolis *

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Mechanical Engineering

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Apr 3, 2024

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6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 1/10 PHYS220_202030_Prelim1 Due Feb 13 at 9am Points 100 Questions 15 Available Feb 13 at 9am - Feb 13 at 11:59am 2 hours and 59 minutes Time Limit 120 Minutes Instructions This quiz was locked Feb 13 at 11:59am. Attempt History Attempt Time Score LATEST Attempt 1 60 minutes 40 out of 100  Correct answers are hidden. Score for this quiz: 40 out of 100 Submitted Feb 13 at 10:04am This attempt took 60 minutes. Please select the best answer for each of these 15 multiple choice questions. You have 120 minutes for this exam. Good luck! 0 / 7 pts Question 1 Incorrect Incorrect How many nanoseconds (ns) does it take for a computer to perform one calculation if it performs 6.7 × 10 calculations per second? 7 11 ns 15 ns 65 ns

6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 2/10 67 ns 0 / 7 pts Question 2 Incorrect Incorrect The mass of Mars, 6.40 × 10 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter? 23 9.76 × 10 kg/m 2 3 1.95 × 10 kg/m 3 3 3.90 × 10 kg/m 3 3 7.81 × 10 kg/m 3 3 6 / 6 pts Question 3 Estimate the number of times the earth will rotate on its axis during a human's lifetime. 3 × 10 8 3 × 10 7 3 × 10 6 3 × 10 5 3 × 10 4

6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 3/10 7 / 7 pts Question 4 Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years. 3 × 10 beats 9 3 × 10 beats 8 3 × 10 beats 10 3 × 10 beats 7 7 / 7 pts Question 5 A diagram representing the motion of two cars is shown below. The number near each dot indicates the clock reading in seconds when the car passes that location. At which instant(s) in time do the cars have the same horizontal position? 1 s 1 s, 2 s, and 3 s

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6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 4/10 1 s, 3 s, and 5 s 1 s, 2 s, 3 s, and 5 s never 6 / 6 pts Question 6 A diagram representing the motion of two cars is shown below. The number near each dot indicates the clock reading in seconds when the car passes that location. At which instant(s) in time do the cars have the same velocity? 1 s 1 s, 2 s, and 3 s 1 s, 3 s, and 5 s 1 s, 2 s, 3 s, and 5 s never 7 / 7 pts Question 7

6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 5/10 A diagram representing the motion of two cars is shown below. The number near each dot indicates the clock reading in seconds when the car passes that location. Which of the following is true about the average acceleration of Car 1 and the acceleration of Car 2 during the time interval shown? Car 1's average acceleration is nonzero and twice that of Car 2. Car 2's average acceleration is nonzero and twice that of Car 1. Car 1's average acceleration is nonzero and equal to that of Car 2. Both cars have an average acceleration of zero. 0 / 7 pts Question 8 Incorrect Incorrect An object is shot vertically upward on the surface of the Earth with a positive initial velocity. Which of the following correctly describes the velocity and acceleration of the object at its maximum elevation, taking the positive direction as upward? Velocity Acceleration Positive Positive Zero Zero

6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 6/10 Negative Negative Zero Negative Positive Negative 0 / 6 pts Question 9 Incorrect Incorrect You throw a small ball upward and notice the time it takes to come back. If you then throw the same ball so that it takes twice as much time to come back, what is true about the motion of the ball the second time? It had half as much acceleration on the way up as it did the first time. It had the same acceleration on the way up as it did the first time. It had twice as much acceleration on the way up as it did the first time. It had more than twice as much acceleration on the way up as it did the first time. 0 / 7 pts Question 10 Incorrect Incorrect A cart rests on a horizontal tabletop with negligible friction. A time-varying horizontal force is exerted on the cart, the magnitude of which is shown by the graph below:

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6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 7/10 Which of the following could represent the horizontal velocity of the cart as a function of time? 0 / 7 pts Question 11 Incorrect Incorrect As a person is sliding down a vertical rope, her grip steadily tightens. This action causes the upward frictional force that the rope exerts on her to increase also. What happens when the upward frictional force is exactly equal in magnitude the force exerted on her by Earth? She will stop. She will begin slowing down.

6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 8/10 She will move at constant velocity. She will start moving upward. She will accelerate downward. 7 / 7 pts Question 12 The magnitude of a vector can never be less than the magnitude of any of its components. True False 0 / 6 pts Question 13 Incorrect Incorrect A block hangs from two ropes at unequal angles, as shown above. The block remains at rest. Which of the following makes correct comparisons of the horizontal and vertical components of the tension in each rope? Horizontal Component Vertical Component greater in rope B greater in rope A equal in both ropes greater in rope A greater in rope A greater in rope A

6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 9/10 equal in both ropes equal in both ropes greater in rope B equal in both ropes 0 / 7 pts Question 14 Incorrect Incorrect For projectile motion with no air resistance, the vertical component of a projectile's acceleration is always zero. remains a non-zero constant. continuously increases. continuously decreases. first decreases and then increases. 0 / 6 pts Question 15 Incorrect Incorrect A player kicks a soccer ball in a high arc toward the opponent’s goal. At the highest point in its trajectory both the velocity and the acceleration of the soccer ball is zero neither the ball’s velocity nor its acceleration is zero the ball’s acceleration is zero but it’s velocity is not zero the ball’s velocity points upward the ball’s velocity points downward.

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6/28/23, 1:53 PM PHYS220_202030_Prelim1: 01B-Spring 2023-Mechanics https://ivylearn.ivytech.edu/courses/1186079/quizzes/4093724?module_item_id=42186492 10/10 Quiz Score: 40 out of 100