Lab 2- Practice Exam_ PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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Mechanical Engineering
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Feb 20, 2024
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14
Uploaded by alena0726
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)
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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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Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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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)
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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)
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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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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)
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-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)
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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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Lab 2- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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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)
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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
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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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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)
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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
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