APPM 1350 Exam #3 Summer 2008
Be sure to include your name and a grading table on the front of your blue book. You must
work all of the problems on this exam. Show ALL of your work and BOX IN YOUR
FINAL ANSWERS. A correct answer with no relevant work may receive no credit, a
wrong answer with no work will receive no credit, and an incorrect answer accompanied
by some correct work may receive partial credit. Text books, class notes, crib sheets, cell
phones, calculators, or electronic devices of any kind are NOT permitted. Please start each
problem on a new page. Good luck!
1. (30 points) Integrate
√t3+π dt (b) Z10t√2t+ 5 dt (c) Z3
r√r2+ 1 dr
√z4+ 9 dz (f) Z−1
2. (15 points) You are at the bottom of a hole and throw a shovel full of dirt up with an
initial velocity of 32 ft
sec . The dirt must rise 17 feet above the release point to clear the
edge of the hole. Does the pile of dirt have enough of an initial velocity to escape from
the hole? If so, by how much? If not, how short was it? Recall that g= 32 f t
3. (15 points) The outside temperature in degrees Fahrenheit at CU on February 1, 2007
can be approximated by the function
T(t) = −10 sin πt
12+15 Where Tis the temperature and tis the time from midnight
(t= 0 corresponds to midnight, t= 13 would correspond to 1pm, etc). What was the
average outside temperature at CU on February 1 (from t= 0 to t= 24)? Round your
answer to the nearest degree if applicable.
4. (20 points) Linearization and Newton’s Method!
(a) Approximate √12 by rewriting it as f(x) = √xand ﬁnding TWO equations
for the local linear approximation of f(x) = √xby selecting two diﬀerent points
near x= 12. Let L1(x) represent the linearization about the smaller xvalue and
L2(x) represent the linearization about the larger xvalue.
(b) Find L1(12) and L2(12).
(c) Now use Newton’s Method with an initial guess of x0= 4 to approximate √12
by letting g(x) = x2
−12 and solving for the positive root of g(x) = 0. Compute
both x1and x2. NOTE: There is some algebra involved, but I have faith that you
can do it. ¨^
5. (20 points) A computer gives a digital readout of fuel consumption for a small aircraft
min . During a 30 minute trip, the following data was collected every 5 minutes:
Time (min) 0 5 10 15 20 25 30
min 2 3 1 3 2 3 1
(a) Make a sketch of the data and clearly label the xand yaxis. Note: Even though
the data is not continuous, both time and fuel consumption are. Therefore we
can “connect the dots” using straight lines to form a continuous graph for the
purposes of this problem. Just remember that anything that is not a data point
is an estimate.
(b) Adding to your sketch from part a, show what a left endpoint approximation
method with six rectangles would look like.
(c) Using a left endpoint approximation method with six rectangles, estimate the
total consumption of gas during the trip.
(d) Have you found an over or under-estimate of the total gas consumption? Justify
97% of all statistics are made up.