Lab 2- Practice Exam_ PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)

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University of North Texas, Dallas *

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Feb 20, 2024

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10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 1/14 Lab 2- Practice Exam Due No due date Points 30 Questions 30 Time Limit None Allowed Attempts 2 Attempt History Attempt Time Score LATEST Attempt 1 19 minutes 28 out of 30 Submitted Oct 16 at 11:43pm Take the Quiz Again 1 / 1 pts Question 1 In the study of physics certain quantities are specified simply by stating the numerical value of the quantity along with appropriate units. Such quantities are referred to as tensors vectors scalars Correct! Correct! dimensions displacements 1 / 1 pts Question 2
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 2/14 Which of the following symbol(s) can be used to indicate that a quantity is a vector? always a capital letter bold letter letter with arrow above it B and C Correct! Correct! All of the above 1 / 1 pts Question 3 Vectors are normally represented by curved arrows. True False Correct! Correct! 1 / 1 pts Question 4 When two or more vectors are added together, must they all have the same units? Yes Correct! Correct! No
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 3/14 1 / 1 pts Question 5 Which of the following quantities is a vector? mass length time volume force Correct! Correct! 1 / 1 pts Question 6 Which of the following types of quantities is NOT a vector? force velocity acceleration speed Correct! Correct! displacement 1 / 1 pts Question 7 A quantity which can be specified by a numerical value coupled with the appropriate units is referred to as:
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10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 4/14 Scalar Correct! Correct! Vector Resultant Equilibrant tensor 1 / 1 pts Question 8 A quantity which is specified by a magnitude and direction with the appropriate units is referred to as: Scalar Vector Correct! Correct! Tangent Operator tensor 1 / 1 pts Question 9 The sum of two or more vectors is called: Equilibrant Scalar
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 5/14 Resultant Correct! Correct! Additive Direction 1 / 1 pts Question 10 A vector which is equal in magnitude to the sum of two or more vectors but opposite in direction is referred to as: Equilibrant Correct! Correct! Resultant Balance Scalar tensor 1 / 1 pts Question 11 Time is not a vector quantity. True Correct! Correct! False 0 / 1 pts Question 12
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 6/14 The order of the addition of two or more vectors matters. True You Answered You Answered False orrect Answer orrect Answer 1 / 1 pts Question 13 Given: Vector-A = 50N @ 45 degrees and Vector-B = 30N @ 120 degrees. If you graphically add Vector-A to Vector-B the best estimate of the resultant Vector-R is 65N @ 70 degrees Correct! Correct! 80N @ 165 degrees 20N @ 75 degrees 58N @ 165 degrees 90N @ 72 degrees 1 / 1 pts Question 14 Based on a graphical sketch of Vector-A equal to 50N @ 30 degrees and Vector-B equal to 50N @ 60 degrees the best estimate of the resultant Vector-R is 95 N @ 30 degrees 95 N @ 60 degrees 95 N @ 90 degrees
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10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 7/14 95 N @ 45 degrees Correct! Correct! 95 N @ 225 degrees 1 / 1 pts Question 15 Based on a graphical sketch of Vector-A equal to 50N @ 30 degrees and Vector-B equal to 50N @ 60 degrees the best estimate of the equilibrant Vector-E is 95 N @ 30 degrees 95 N @ 60 degrees 95 N @ 90 degrees 95 N @ 45 degrees 95 N @ 225 degrees Correct! Correct! 1 / 1 pts Question 16 Given Vector-A is 40. N @ 53 degrees what is the magnitude of the horizontal component of Vector-A? The component is called Vector-Ax. 31.9 24 Correct! Correct! zero 24.1
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 8/14 -36.7 1 / 1 pts Question 17 Given Vector-A is 40. N @ 53 degrees what is the magnitude of the vertical component of Vector-A? The component is called Vector-Ay. 32 Correct! Correct! 24.1 zero 31.9 15.8 1 / 1 pts Question 18 A car travels 20.0 km north and then 35.0 km in a direction 60.0 degrees west of north. Find the magnitude and direction of the car's resultant displacement. 48.2 km @ 38.9 degrees east of north 48.2 km @ 38.9 degrees west of north Correct! Correct! 40.3 km @ 60.26 degrees west of north 48 km @ 39 degrees west of north 48.2 km @ 38.9 radians east of north
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 9/14 1 / 1 pts Question 19 If you are given that A and B are forces acting on an object and A = 3 lbs and B = 6 lbs what is the smallest force that can act on that object? 3 lbs Correct! Correct! 6 lbs 9 lbs 18 lbs 0 lbs 1 / 1 pts Question 20 If you are given that A and B are forces acting on an object and A = 3 lbs and B = 6 lbs what is the maximum force that can act on that object? 3 lbs 6 lbs 9 lbs Correct! Correct! 18 lbs 0 lbs 1 / 1 pts Question 21
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10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 10/14 If you are given that the resultant of two vectors equals 15.0 N @ 33.0 degrees what is their equilibrant? 15 N @ 23 degrees 15.0 N @ 213 degrees Correct! Correct! 15 N @ 210 degrees 15 N @ 180 degrees 30.0 N @ 213.0 degrees 1 / 1 pts Question 22 When two force vectors are added the resultant is found experimentally by adding the respective magnitudes then adding respective directions graphically superimposing the two vectors on the x-axis graphically combining the vectors so that the tip of one connects to the tail of the other balancing the resultant of the vectors against the equilibrant Correct! Correct! using trigonometry 1 / 1 pts Question 23 To experimentally verify the process of doing vector addition
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 11/14 graph paper is needed trigonometry is needed a force table is used Correct! Correct! the parallelogram method is used the tip-to-tail addition method is used 0 / 1 pts Question 24 The purpose of this experiment is to find the resultant of a set of vectors using the notion that the equilibrant is equal and opposite to the resultant orrect Answer orrect Answer the resultant is a single vector that balances the vector sum You Answered You Answered at equilibrium the equilibrant equals zero at equilibrium the sum of the resultant and equilibrant is positive the parallelogram method of addition is valid The purpose of this experiment is to find the resultant of a set of vectors using the notion that the equilibrant is a single vector that balances the vector sum. 1 / 1 pts Question 25
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 12/14 A major source of error in this experiment is using judgment when testing for equilibrium one fails to insure that all strings point exactly at the center of the pin Correct! Correct! failing to accurately measure the mass of the weight hangers when establishing the direction of the resultant force vector to discriminate between gram masses and gram weights to determine the friction in the support pulleys 1 / 1 pts Question 26 When two force vectors are added the resultant is found experimentally by balancing the resultant of the vectors against the equilibrant. True Correct! Correct! False 1 / 1 pts Question 27 Before placing vectors on the force table, you must convert them using a scale which sets up a correspondence of their __________ to ____________. weight; length Correct! Correct! weight; height
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10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 13/14 mass; length length; mass weight; mass 1 / 1 pts Question 28 You balanced the original set of vectors with their ____________. Resultant Equilibrant Correct! Correct! Sum Difference Total 1 / 1 pts Question 29 The purpose of the center pin is _____________________. To tie the strings to To hold the ring in place while adding masses to the weight hanger Correct! Correct! To provide a center point to mark 180 degrees to mark 360 degrees
10/16/2019 Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1) https://unt.instructure.com/courses/20982/quizzes/99129 14/14 1 / 1 pts Question 30 If your weight hangers did not have an exact mass of 50.0 g (which you assume) would that affect your determination of the equilibrant? Yes Correct! Correct! No