Lab 3- Practice Exam_ PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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1730
Subject
Mechanical Engineering
Date
Feb 20, 2024
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14
Uploaded by alena0726
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
https://unt.instructure.com/courses/20982/quizzes/99127
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Lab 3- Practice Exam
Due
No due date
Points
30
Questions
30
Time Limit
None
Allowed Attempts
2
Attempt History
Attempt
Time
Score
LATEST
Attempt 1 12 minutes
30 out of 30
Submitted Oct 16 at 11:56pm
Take the Quiz Again
1 / 1 pts
Question 1
Basic calculus is used to derive the equation vf^2 = vi^2 + 2ax where vf^2
means final speed vf squared; vi^2 means initial speed vi squared; x stands
for distance traveled; and symbol a stands for the magnitude of constant
acceleration. To begin the derivation of this equation one assumes which of
the following definitions.
a = dv/dt = constant v = dx/dt a = dv/dt = constant AND v = dx/dt Correct!
Correct!
a = (vf-vi)/t x = ((vf+vi)/2)*t 1 / 1 pts
Question 2
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Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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Can the magnitude of average velocity and average linear speed ever be
equal?
Yes Correct!
Correct!
No 1 / 1 pts
Question 3
Is it possible to have a situation in which the velocity and acceleration have
opposite signs?
Yes Correct!
Correct!
No 1 / 1 pts
Question 4
A ball is thrown vertically upward. What are its velocity and acceleration
when it reaches maximum altitude?
Acceleration is 9.8 m/s^2 towards the ground.
Velocity is zero.
Correct!
Correct!
Acceleration is zero.
Velocity is zero.
Acceleration is zero.
Velocity is at a maximum.
Acceleration is 9.8 m/s^2 away from the ground.
Velocity is zero.
Acceleartion is 9.8 m/s^2 towards the ground.
Velocity is 9.8 m/s.
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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1 / 1 pts
Question 5
Given v = dx/dt it follows that dt = dx/v. Now given that a = dv/dt it follows that
a = dv/(dx/v). Which of the following is true?
adx = vdv Correct!
Correct!
adx = dv/v adv = dx/v a = v x = a/v 1 / 1 pts
Question 6
Assuming a = constant and adx = vdv and given initial conditions that at time
t = 0 distance x = 0 and initial speed = vi. At some later time t the final speed
is vf. If you integrate both sides of the equation adx = vdv then
ax = (vf^2 - vi^2)/2 Correct!
Correct!
ax^2 = vf^2 -vi^2 ax^2 = (vf - vi)^2 ax = (vf^2)/2 ax = vi^2/2
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1 / 1 pts
Question 7
The limit of the time rate of change of velocity as the time interval
approaches zero defines instantaneous
displacement speed velocity acceleration Correct!
Correct!
force 1 / 1 pts
Question 8
The magnitude of the average velocity is equal to the average linear speed.
True False Correct!
Correct!
1 / 1 pts
Question 9
The magnitude of the instantaneous velocity is equal to the instantaneous
speed.
True Correct!
Correct!
False
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1 / 1 pts
Question 10
If acceleration is constant, the graph of acceleration versus time is:
straight line with a positive slope curved line straight line with slope equal to zero Correct!
Correct!
straight line with a decreasing slope parabola 1 / 1 pts
Question 11
The area under a velocity versus time curve is equal to:
Final velocity Magnitude of the displacement Correct!
Correct!
Acceleration Time of travel Speed 1 / 1 pts
Question 12
In MKS units velocity has units of __________ while acceleration has units of
___________.
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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m; m/s m/s; m/s^2 Correct!
Correct!
m/s^2; m m/s^2; m/s m; m*s 1 / 1 pts
Question 13
Consider a circular track with a radius of 200. m. A runner starts on the East
side and runs around the track to a point diametrically opposite her starting
point. She has run __________ m but her displacement is __________ m.
1257 m; 800. m West
628 m; 400. m West
Correct!
Correct!
628 m; 400. m East
314. m; 200. m West
400. m; 628 m East
1 / 1 pts
Question 14
Consider a circular track with a radius of 200. m. A runner starts on the East
side and runs around the track to a point diametrically opposite her starting
point. She then runs the rest of the way around the track to complete a full
lap. She has run __________ m but the magnitude of her displacement is
_________ m.
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1260 m; zero meters
Correct!
Correct!
1257 m; 1257 m 314 m; 400 m
zero meters; 1260 m 400 m; 628 m
1 / 1 pts
Question 15
Consider a circular track with a radius of 200. m. A runner starts on the East
side and runs around the track to a point diametrically opposite her starting
point. This half-lap takes 120. s to run. What is her average speed in m/s?
5.24 Correct!
Correct!
3.33 3.14 6.28 10.48 1 / 1 pts
Question 16
Consider a circular track with a radius of 200. m. A runner starts on the East
side and runs around the track to a point diametrically opposite her starting
point. This half-lap takes 120.s to run. Over the displacement, what is the
magnitude of her average velocity in m/s?
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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5.24 3.33 Correct!
Correct!
3 6.28 10.48 1 / 1 pts
Question 17
A jet aircraft rolls onto the end of a runway before accelerating down the
runway to takeoff. At the point where the aircraft leaves the ground it is
traveling 100. m/s. If the initial speed as the aircraft rolled onto the runway
was 10. m/s and it accelerates uniformly for 20. s before takeoff; what is the
magnitude of the acceleration during the time it takes to takeoff?
9.5 m/s^2 4.5 m/s^2 Correct!
Correct!
10 m/s^2 5.5 m/s^2 5 m/s^2 1 / 1 pts
Question 18
A flat object starting from rest slides down a frictionless 10.-m long surface
inclined at an angle of 30.0 degrees. Assume the acceleration due to gravity
is 9.80 m/s^2. In m/s^2 what is the acceleration of the sliding object down the
inclined surface?
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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9.80 m/s^2 8.50 m/s^2 5.70 m/s^2 4.90 m/s^2 Correct!
Correct!
10 m/s^2 1 / 1 pts
Question 19
A flat object starting from rest slides down a frictionless 10.-m long surface
inclined at an angle of 30.0 degrees. Assume the acceleration due to gravity
is 9.80 m/s^2. In m/s what is the linear speed of the sliding object at the end
of 3.0 s?
29.4 m/s 25.5 m/s 17.1 m/s 15 m/s
Correct!
Correct!
15 cm/s 1 / 1 pts
Question 20
A flat object starting from rest slides down a frictionless 10.0-m long surface
inclined at an angle of 30.0 degrees. Assume the acceleration due to gravity
is 9.80m/s^2. How long in seconds does it take the object to slide to the end
of the 10.0-m long inclined surface?
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Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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1.57 s 1.0 s 2.02 s Correct!
Correct!
4.9 s 2 s 1 / 1 pts
Question 21
A flat object starting from rest slides down a frictionless a 10.-m long surface
inclined at an angle of 30. degrees. Assume the acceleration due to gravity is
9.80 m/s^2. In m/s how fast is the object sliding when it reaches the end of
the 10.-m long inclined surface?
98 m/s 49 m/s 9.9 m/s Correct!
Correct!
4.9 m/s 2.5 m/s 1 / 1 pts
Question 22
It was stated early that velocity is a vector, yet only a magnitude was
calculated in the experiment. What is the direction of the velocity vector
(along the airtrack)?
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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toward the low end Correct!
Correct!
toward the high end straight down straight up horizontal 1 / 1 pts
Question 23
As you tilt the airtrack higher, the acceleration of the glider increases; thus,
acceleration is dependent on the angle of incline. Should it depend on mass
as well?
Yes No Correct!
Correct!
1 / 1 pts
Question 24
Which of the following affects the accuracy of the results of the experiment:
Glider starting position Mass of glider Measurement of distance between the photogates A and B A and C Correct!
Correct!
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
https://unt.instructure.com/courses/20982/quizzes/99127
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1 / 1 pts
Question 25
In this experiment which of the following was measured?
actual length of glider length of glider that photogate sees Correct!
Correct!
1 / 1 pts
Question 26
True or False. When calculating the slope of a graph it is satisfactory to use
actual experimental data points rather than arbitrary points that the line
passes through.
True False Correct!
Correct!
1 / 1 pts
Question 27
When determining the theoretical acceleration it was necessary to measure
the height of the airtrack at two separate positions and their distance of
separation. Why couldn't you simply measure one height at the top of the
airtrack and use the length of the track for your distance of separation?
The air track is not sitting on the table; second height is not zero. Correct!
Correct!
Need to take an average to obtain better results
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1 / 1 pts
Question 28
Why weren't you asked to weigh the gliders?
The gliders have a standard mass that cancels out of the equations Mass has no affect on the outcome of this experiment Correct!
Correct!
1 / 1 pts
Question 29
Which of the following does not affect the accuracy of the results of the
experiment:
Glider starting position Friction of the airtrack and the height the airtrack is raised Mass of Glider Measurement of distance between the photogates B and C Correct!
Correct!
1 / 1 pts
Question 30
In part A you calculated average velocity. Was it important to know the glider
length that the photogate saw?
Yes No Correct!
Correct!
10/16/2019
Lab 3- Practice Exam: PHYS 1730 Lab Sections - Laboratory in Mechanics (Fall 2019 1)
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