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All the vector quantities in the solving of the unknown in the belt force system obey _____________

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All the vector quantities in the solving of the unknown in the belt force system 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 during an interview for a job.

My doubt stems from Frictional Forces on Flat Belts topic in division Friction of Engineering Mechanics

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The correct answer is (a) Parallelogram law of addition

To explain I would say: 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.

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