Asked by Alex
If 'a' and 'b' are unit vectors that make an angle of 60 degrees with each other, calculate
l 3a - 5b l and l 8a + 3b l
*the 'a' and 'b' have a carat of top of them*
How do i answer this without using components?
l 3a - 5b l and l 8a + 3b l
*the 'a' and 'b' have a carat of top of them*
How do i answer this without using components?
Answers
Answered by
Steve
I guess you could use the law of cosines.
Draw a diagram and you will see that
|3a-5b|^2 = 3^2+5^2-2*3*5*cos120°
do the same for the other
Draw a diagram and you will see that
|3a-5b|^2 = 3^2+5^2-2*3*5*cos120°
do the same for the other
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.