We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
273
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+99580 
+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

32 Online Users

avatar
avatar