- #1
nobodyuknow
- 64
- 0
Homework Statement
http://prntscr.com/p7dxt
Here's a screenshot of the revision question.
Homework Equations
The Attempt at a Solution
Co-ordinates of each point
A, (0, 60, 0)
B, (40, 0, 0)
C, (-40, 0, 40)
D, (-60, 0, -60)
Position Vectors
rAB, 40i + -60j + 0k
rAC, -40i + -60j + 40k
rAD, -60i + -60j + -60k
Unit Vectors corresponding these position vectors
eAB, 0.5547i + -0.8321j + 0k
eAC, -0.4851i + -0.7276j + 0.4851k
eAD, -0.5774i + -0.5774j + -0.5774k
This is all I know, I'm not sure how to complete the other questions.
For question would I have to put the two position vectors and do a cross product?
Something like...
i j k
-0.4851 -0.7276 0.4851
-0.5774 -0.5774 -0.5774
[(-0.7276)(-0.5774) - (0.4851)(-0.5774)]i + [(-0.4851)(-0.5774) - (0.4851)(-0.5774)]j + [(-0.4851)(-0.5774) - (-0.7276)(-0.5774)]k
If not, I'm totally lost, and need help!
Last edited: