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Math 1321 Quiz 6 Name:
September 30, 2002
Instructions:
1. Be sure to show all your work, NO WORK = NO CREDIT!!
2. Read all questions carefully and be sure to give the result wanted.
3. Box in or highlight your flnal answer. NO BOX = NO CREDIT
1. Exercise 3.2, Problem 4 From a point A on the top of a clifi that is 115m above sea level,
the angle of depression of an anchored rowboat B is 22:0o. Find the length of the airline
distance AB from the clifi to the boat.
Air
line
Di
stance
1
1
5
m
A
B
22.0
68.0
AB = 115cos68o = 307m
Therefore the airline distance AB from the clifi to the boat is 307 meters.
2. Exercise 3.3, Problem 12: An airplane with a cruising speed of 220 km/hr in still air
moves with a heading of 72o. Find the speed of a north wind that makes the plane trave due
east.
a0
a1
a2a3
a4a6a5a8a7a10a9
a11
a11a13a12
a0a15a14a17a16 a18a20a19a21a3a23a22a24 a25
a27
So we need to solve for X so we use sin18o = X220 So we get X = 220sin18o = 67:9837 .
68mph. Therefore the s...

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