Page 47


Problem 1


2011-02-10_0004.jpg



Problem 2 and 3


should be 36.87 degrees



Problem 4


2011-02-10_0005.jpg



Problem 5






Problem 6


Look at the vectors from one point to the other. From (2,5,6) to (12,25,37) is the vector [10,20,31].
From (2,5,6) to (27,55,81) is the vector [25,50,75]. Notice that [25,50,75]=25[1,2,3] and [10,20,31]=10[1,2,3.1].

Close to being collinear, but not quite.



Problem 7


When the line intersects the xz=plane, y=0.



Substitute this value of r to find the coordinates.



Problem 8


page 47 #8
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Problem 9


page 47 #9
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Problem 10


Page 47 #10
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2011-02-11_0001.jpg



Problem 11


2011-02-10_0007.jpg



Problem 12


2011-02-10_0006.jpg




Page 48


Problem 1


2011-02-13_0001.jpg



Problem 2


Page 48 #2
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Problem 3


Page 48 #3
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Problem 4


Page 48 #4
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Problem 5


Page 48 #5
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Problem 6 and 7


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Problem 8


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Problem 9


Page 48 #9
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Problem 10




Problem 11


2011-02-14_0002.jpg



Problem 12


You need to develop a systematic counting strategy.

I think there are 35, and NONE are scalene



Problem 13


2011-02-14_0003.jpg



Problem 14


It would be a great exercise to construct a drag-testable model similar to the one that I created.

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