If the position vectors of P and Q are i + 3j- 7k and 5i- 2j+ 4k respectively, find PQ and determine its direction cosines.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter1: Vectors
Section1.3: Lines And Planes
Problem 18EQ
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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 + 2i- 4k, OC =-i+ 3j- 2k, determine
%3D
%3D
(i) the vector AB
(ii) the vector BC
(iii) the vector product AB X BC
(iv) the unit vector perpendicular to the plane ABC
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 + 2i- 4k, OC =-i+ 3j- 2k, determine %3D %3D (i) the vector AB (ii) the vector BC (iii) the vector product AB X BC (iv) the unit vector perpendicular to the plane ABC
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