Example 1 Magnitude of two perpendicular vectors P andQ are 5 and 7respectively. Draw and find the magnitude and direction for P+Q andP-Q
operations.
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Answer:
See the above question can be easily simplified as:
|P| = 5
|Q|= 7
since these vectors are perpendicular to each other. Hence the angle between them = 90
therefore P+Q= √P²+Q²+PQcos90= √P²+Q²= √49+25= √74
similarily P-Q= √P²+Q²-2PQcos90=√49+25=√74
Explanation:
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