12 If the position vectors of P and Q are i+3j- 7k and 5i - 2j + 4k respectively, find PQ and determine its direction cosines.
12 If the position vectors of P and Q are i+3j- 7k and 5i - 2j + 4k respectively, find PQ and determine its direction cosines.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:12 If the position vectors of P and Q are i+ 3j – 7k and 5i – 2j + 4k
respectively, find PQ and determine its direction cosines.
13 If position vectors, OA, OB, OC, are defined by OA = 2i – j+ 3k,
OB = 3i + 2j - 4k, OC = -i+ 3j – 2k, determine:
(a) the vector AB
(b) the vector BC
(c) the vector product AB x BC
(d) the unit vector perpendicular to the plane ABC.
%3D
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