+0  
 
0
234
1
avatar+956 

What is this direction cosine for the vector (7,4,-3) with the positive z-axis? 

 

a) -3/74 

b) -3/√(74)

c) 3/74

d) 3/√(74)

 May 23, 2018
 #1
avatar+96302 
+1

The directional cosine  is

 

-3  / sqrt  [ 7^2  + 4^2 + (-3)^2  ] =

 

-3 / sqrt  [ 49 + 16 + 9  ] =

 

-3  / sqrt [ 74 ]

 

 

cool cool cool

 May 23, 2018

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