STATE THE TRIANGULAR LAW OF VECTOR. FIND THE MAGNITUDE OF THE VECTOR 2i+4j+7k.

Asked by swarajtopper | 30th Jul, 2015, 12:29: PM

Expert Answer:

Triangular law of vector states that if two vectors can be represented in magnitude and direction by the two sides of a triangle taken in the same order, then the resultant is represented completetly (both in magnitude and direction) by the third side of the triangle taken in the opposite order.
 
Magnitude of the vector 2i+4j+7k:

begin mathsize 14px style open vertical bar straight A with rightwards arrow on top close vertical bar equals square root of Ax squared plus Ay squared plus Az squared end root equals square root of 2 squared plus 4 squared plus 7 squared end root equals square root of 4 plus 16 plus 49 end root equals square root of 69 end style

Answered by Faiza Lambe | 30th Jul, 2015, 03:49: PM

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