Saved Bookmarks
| 1. |
Two vectors `vecA` and `vecB` have magnitude in the ratio `1:2` respectively. Their difference vector has as magnitude of 10 units, and the angle between `vecA & vecB` is `120^(@)` . The magnitude of `vecA and vecB` are :A. `(5)/(sqrt(7)) , (10)/(sqrt(7))`B. `(5)/(sqrt(3)) , (10)/(sqrt(3))`C. `(10)/(sqrt(7)) , (20)/(sqrt(7))`D. `(10)/(sqrt(3)) , (20)/(sqrt(3))` |
|
Answer» Correct Answer - C Two vectors …………. `x_(1) 2x` `sqrt(x^(2)+(2x)^(2)-2(x)(2x)cos(120)) = 10` `sqrt(5x^(2)+2x^(2)) = 10` `sqrt((100)/(7) = x` `|vecA| = (10)/(sqrt(7)) : |vecB| = (20)/(sqrt(7))` |
|