Question

For calculations involved for cable subjected to its own weight all the vectors quantities obey :

(a) Parallelogram law of addition

(b) Parallelogram law of multiplication

(c) Parallelogram law of addition of square root of their magnitudes

(d) Parallelogram law of addition of square of their magnitudes

The question was posed to me in unit test.

Query is from Cables Subjected to its Own Weight in section Internal Forces of Engineering Mechanics

Answer 1

Right choice is (a) Parallelogram law of addition

Easiest explanation: All the vectors quantities obey parallelogram law of addition. Two vectors A and B (can be called as component vectors) are added to form a resultant vector. R = A+B.