Week 5 Quiz_ PHYS180A-1001_Fundamentals of Physics
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School
San Diego State University *
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Course
180A
Subject
Mathematics
Date
Feb 20, 2024
Type
Pages
5
Uploaded by AdmiralBraveryTapir13
10/11/23, 12:24 PM
Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics
https://sdsu.instructure.com/courses/137053/quizzes/272009
1/5
Week 5 Quiz Due
Sep 22 at 1:50pm
Points
50
Questions
8
Available
Sep 22 at 1pm - Sep 22 at 3pm 2 hours
Time Limit
50 Minutes
Instructions
This quiz was locked Sep 22 at 3pm.
Attempt History
Attempt
Time
Score
LATEST
Attempt 1
10 minutes
42 out of 50
Score for this quiz: 42
out of 50
Submitted Sep 22 at 1:11pm
This attempt took 10 minutes.
This is an open-book open-note quiz based on Week 5 Homework
(https://sdsu.instructure.com/courses/137053/modules/items/3316671) . The time limit is 50 minutes. This weekly quiz is meant to be a self-evaluation tool to check well the whole week's material has been
mastered, and get prepared for the Unit Test 2. Correct answers will be available after 3pm
. You may come to the office hour Friday 8-9pm to request a
second chance to retake this quiz over the weekend.
25 / 25 pts
Question 1
Have you completed Week 5 Homework?
Yes Correct!
Correct!
No
10/11/23, 12:24 PM
Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics
https://sdsu.instructure.com/courses/137053/quizzes/272009
2/5
3 / 3 pts
Question 2
Answer 1:
A cleaner pushes a 6.55-kg laundry cart in such a way that the net
external force on it is 30.0 N. The magnitude of its acceleration is
4.58
m/s
. (Keep three significant figures for all the
answers)
2
4.58
Correct!
Correct!
3 / 3 pts
Question 3
Answer 1:
A 57.0-kg sprinter starts a race with an acceleration of 3.60 m/s
. The net
external force on him is 205
N. (Keep three significant
figures for all the answers)
2
205
Correct!
Correct!
0 / 3 pts
Question 4
Answer 1:
Consider a rocket sled (mass 2.40×10
kg) starts with one rocket burning
(the thrust T is 3.00×10
N). The force of friction opposing the motion is
known to be 705 N. The magnitude of its acceleration is
12.4
m/s
. (Keep three significant figures for all the
answers)
3
4
2
10/11/23, 12:24 PM
Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics
https://sdsu.instructure.com/courses/137053/quizzes/272009
3/5
12.4
ou Answered
ou Answered
12.2 orrect Answer
orrect Answer
3 / 3 pts
Question 5
What force does a trampoline have to apply to a 45.0-kg gymnast to
accelerate her straight up at 7.00 m/s
? (in the unit of N) (Keep three
significant figures for all the answers)
2
315N
Correct!
Correct!
orrect Answers
orrect Answers
315 315 N 315N 4 / 4 pts
Question 6
Answer 1:
Answer 2:
Suppose a 54.0-kg gymnast climbs a rope. g = 9.80 m/s
. If the gymnast
climbs at a constant speed, the tension in the rope is 529
N. If the gymnast climbs with an upward acceleration of 2.00 m/s
, the
tension in the rope is 637
N. (Keep three significant
figures for all the answers)
2
2
529
Correct!
Correct!
637
Correct!
Correct!
Your preview ends here
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10/11/23, 12:24 PM
Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics
https://sdsu.instructure.com/courses/137053/quizzes/272009
4/5
4 / 6 pts
Question 7
Answer 1:
Answer 2:
Answer 3:
When starting a foot race, a 70.0-kg sprinter exerts an average force of
650 N backward on the ground for 0.800 s. His acceleration is
9.29
m/s
. His final speed is 7.43
m/s. He
travels 2.37
m during this 0.800 s. (Keep three significant
figures for all the answers)
2
9.29
Correct!
Correct!
7.43
Correct!
Correct!
2.37
ou Answered
ou Answered
2.97 orrect Answer
orrect Answer
0 / 3 pts
Question 8
If the sprinter accelerates at the rate of 2.50 m/s
for 20.0 m, and then
maintains that velocity for the remainder of the 50.0-m dash, what will be
his time for the race?
2
5.00 s 7.00 s orrect Answer
orrect Answer
4.00 s
10/11/23, 12:24 PM
Week 5 Quiz: PHYS180A-1001:Fundamentals of Physics
https://sdsu.instructure.com/courses/137053/quizzes/272009
5/5
9.00 s ou Answered
ou Answered
Quiz Score: 42
out of 50