- #1
hyde2042
- 26
- 0
Homework Statement
A force F =( 6 i - 2 j ) N acts on a particle that under
goes a displacement D r = ( 3 i + j )m. Find (a) the work done
by the force on the particle and (b) the angle between F
and D r .
Homework Equations
I've found the work to be about 16N. My problem is finding the angle.
The equation thebook gives is cos(inv)* (Products of vectors A and B) / (A)(i^2+j^2)*(B)(i^2+j^2)
The Attempt at a Solution
I used cas(inv)*((VectorA * VectorB) / sqrt(6^2-2^2)(3^2+1^2))
Which came out to 26 degrees. The back of the book says 36.9 degrees for the answer. I don't think I'm missing anything. All your help is appreciated. Thank you.