Take-Home Quiz # 2
(Sections 5.1 – 5.4)
Math 141/6380, Due 11:59PM, Sunday, June 11, 2017
Instructions: This quiz must be completed independently. You are allowed to
consult with your notes or the textbook as needed to aid you in solving these
problems. Seeking help from others in or out of the class is not allowed. Suggestions about how to approach this quiz:
1. Finish all homework assignments of the sections and get good
understanding of the contents from the last week.
2. Print out a copy of the quiz and solve any problems that you can,
using pencil and paper.
3. Review the eBook sections associated with any problems you
could not solve.
4. Complete the remaining problems to the best of your ability.
Even if you cannot come to a final solution, you should show
what you do know so that you have the opportunity for partial
credit.
5. Review your work. Check for errors. Make sure you have included
units where appropriate, and explanations when required by the
instructions. Unless the problem explicitly states otherwise, work
must be shown for every answer. Any answer, even if “correct”
but lacking work, will NOT receive full credit and may receive NO
credit!
6. When you are satisfied, type in your solutions (extend space if
needed) or scan your hand written work or take photos with
your camera. Make sure that your submission is readable.
7. Submit your work in the associated LEO assignment.
Unless the problem explicitly states otherwise, work must be
shown for every answer. Any answer, even if “correct” but
lacking work, will NOT receive full credit and may receive NO
credit!
Please submit the quiz as an attachment in any readable formats such
as scanned or photo copy before or on Sunday, June 11. No late quiz
will be accepted. No make-up quiz will be arranged. A solution
key for Quiz # 2 will be posted along with the quiz right after the
deadline. Please sign (or type) your name below the following honor pledge:
I have completed this quiz by myself, working independently and not
consulting anyone except the instructor. I have neither given nor
received help on this quiz. No calculator is allowed in solving the definite integrals in this
quiz. Leave answers involving irrational numbers as is. Do not
use calculator estimations.
Name _____________________ Date___________________ QUIZ # 2 Problems
(An answer, even if “correct” but lacking work, will NOT receive full
credit!)
1. The area enclosed between y=x 2 +2 and y=3 is revolved about the horizontal
line y=3 to form a solid. Calculate the volume. (Hint: Disks) 2. Let R be the region between the graphs of f (x) and g(x) on the given interval. Find
the volume V of the solid obtained by revolving R about the x- axis, where
and
[0, 4]. （Hint: Solids with Holes（
x
2
f ( x) x 3
g ( x) 3 x 1 3. Find the arc length of the curve 2
y x3/ 2 2
3 4. Find the length of the curve 2 x ( y 2)
3 3/ 2 over the interval [1, 8] from y = 0 to y = 3 5. Find the area of the surface generated by revolving about the x-axis the curve
on
.
[−1, 0]
f ( x) 2 1 x
6. Find the area of the surface generated by revolving about the x-axis the curve
on 1
y x3
3 . [0, 2 ] 7. Suppose that a spring has a natural length of 10 ft and that a weight of 100 lb is
required to hold it compressed to a total length of 6 ft. How much work is required to
stretch the spring from a total length of 15 ft to 25 ft?
10 ft x=0 15ft x=5 25ft x = 15 8. Find ( ´x , ´y ) , centroid of the region of constant density k covering the region
bounded by the parabola
and the line
. (Hint: Find the intersections
2
y 2
x
y 2 x x
first, then find M , ´x ∧ ´y , respectively ).

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