Question

If `|bar"a"|` = 10, `|bar"b"| = 2`, then `sqrt(|bar"a" xx bar"b"|^2 + |bar"a"*bar"b"|^2)` = ?

पर्याय

• 10

• 20

• 40

• 50

Answer 1

20

Explanation:

`sqrt(|bar"a" xx bar"b"|^2 + |bar"a"*bar"b"|^2)`

`= sqrt(sin^2 theta |bar"a"|^2 |bar"b"|^2 + cos^2 theta |bar"a"|^2 |bar"b"|^2)`

`= sqrt(|bar"a"|^2 |bar"b"|^2)`

`= |bar"a"||bar"b"|`

= (10)(2) = 20