2.5 HW Physical Applications
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De Anza College *
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107
Subject
Mechanical Engineering
Date
Feb 20, 2024
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6
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1/27/24, 3:37 PM
2.5 HW Physical Applications
https://rsccd.instructure.com/courses/111152/assignments/2181504
1/6
2.5 HW Physical Applications
Due
Jan 11 by 2pm
Points
10
Submitting
an external tool
Prepare
Make sure you have read and viewed the following before you begin:
Section Reading
Section Videos
Introduction
You will view a video and then answer a question about it.
For each question, you have unlimited attempts. After the third attempt, the answer will be
given and a new version of the question can be generated.
To navigate the assignment, use the page links on the left side of the assignment where it says
"Pages" to view the different sections of the assignment and access all practice questions.
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1/27/24, 3:37 PM
2.5 HW Physical Applications
https://rsccd.instructure.com/courses/111152/assignments/2181504
2/6
Due Date: Thu 1/11/24, 2:00 pm
Score in Gradebook: 10/10
Grade is calculated on the best version of each question
Show Intro and Between-Question Text
You are in the gradebook. You cannot edit answers or submit questions from here.
Question 1. Score: 1/1
Time spent on this version: 2.2 minutes. Show all tries
Had help available: Video
Question 2. Scored attempt.
Score: 10/10
.
Version 1*/1. Score: 1/1
How much work is done lifting a 10 pound object from the ground to the top of a 40 foot building if
the cable used weighs 1.5 pounds per foot?
1600
foot-pounds.
Version 3*/3. Score: 1/1
You are at the top of a 90 foot tall building
and are lifting an object that weighs 140 pounds.
The object is lifted from the bottom of the building
to a height of 80 feet using a chain that
weighs 0.3 pounds per foot.
Represent the amount of WORK you do as an integral.
Work = 140 + 0.3 90 −
x
dx
a = 0
b = 80
(
)
1/27/24, 3:37 PM
2.5 HW Physical Applications
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3/6
Score: 0.25/0.25 0.25/0.25 0.25/0.25 0.25/0.25
Time spent on this version: 0.9 minutes.
Question 3. Score: 1/1
Time spent on this version: 1 minutes.
Had help available: Video
Question 4. Score: 0.25/0.25 0.25/0.25 0.25/0.25 0.25/0.25
Time spent on this version: 0.8 minutes. Show all tries
Then evaluate the integral. Work = 12400
Version 2*/2. Score: 1/1
A force of pounds is required to hold a spring stretched 0.1 feet beyond its natural length. How
much work (in foot-pounds) is done in stretching the spring from its natural length to 0.7 feet beyond
its natural length? 2.45
Version 1*/1. Score: 1/1
A spring has a rest length of 12 inches
and the spring constant is K = 4.
How much work is done stretching the spring
from a length of 12 inches to a length
of 20 inches?
Represent the amount of WORK as an integral.
Work = 4
x
dx
a = 0
inches
b = 8
inches
Then evaluate the integral. Work = 128
inch*pounds
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1/27/24, 3:37 PM
2.5 HW Physical Applications
https://rsccd.instructure.com/courses/111152/assignments/2181504
4/6
Question 5. Score: 0.25/0.25 0.25/0.25 0.25/0.25 0.25/0.25
Time spent on this version: 0.7 minutes.
Question 6. Score: 1/1
Time spent on this version: 2.1 minutes. Show all tries
Had help available: Video
Question 7. Version 4*/4. Score: 1/1
A spring has a rest length of 9 inches
and a force of 5 pounds stretches
the spring to a length of 17 inches.
How much work is done stretching the spring
from a length of 9 inches to a length
of 14 inches?
Represent the amount of WORK as an integral.
Work = 8
5
x
dx
a = 0
inches
b = 5
inches
Then evaluate the integral. Work = 7.8125
inch*pounds
Version 1*/1. Score: 1/1
Work of Joules is done in stretching a spring from its natural length to 17 beyond its natural
length. What is the force (in Newtons) that holds the spring stretched at the same distance (17 )?
47.06
Version 5*/5. Score: 1/1
A circular swimming pool has a diameter of 14 m, the sides are 3 m high, and the depth of the water
1/27/24, 3:37 PM
2.5 HW Physical Applications
https://rsccd.instructure.com/courses/111152/assignments/2181504
5/6
Score: 1/1
Time spent on this version: 1.2 minutes.
Had help available: Video
Question 8. Score: 1/1
Time spent on this version: 0.4 minutes.
Had help available: Video
Question 9. is 2 m. How much work (in Joules) is required to pump all of the water over the side? (The
acceleration due to gravity is 9.8 and the density of water is 1000 .)
6034369.6
Version 10*/10. Score: 1/1
A trough is 9 meters long, 3 meters wide, and 2 meters deep. The vertical cross-section of the trough
parallel to an end is shaped like an isoceles triangle (with height 2 meters, and base, on top, of
length 3 meters). The trough is full of water (density ). Find the amount of work in joules
required to empty the trough by pumping the water over the top. (Note: Use as the
acceleration due to gravity.)
176400
Joules
Version 3*/3. Score: 2/2
A tank, shaped like a cone has height meters and base radius meters long. It is placed so that the
circular part is upward. It is full of water, and we have to pump it all out by a pipe that is always
leveled at the surface of the water. Assume that a cubic meter of water weighs , i.e. the
density of water is ± . How much work does it require to pump all water out of the tank?
Enter the exact value of your answer.
367500
π
Joules
1/27/24, 3:37 PM
2.5 HW Physical Applications
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6/6
Score: 2/2
Time spent on this version: 0.2 minutes.
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