Posted by **koks** on Sunday, December 2, 2012 at 3:05am.

find the magnitude of vector by scalar and vector A= ? + 4j +4k B= ? + 2j + 3k if the angle between them 15 degrees.

- physics -
**bobpursley**, Sunday, December 2, 2012 at 10:36am
There is some algebra to this..

AdotB=MagA*MagB*costheta

ab+8+12=sqrt[(a^2+14+16)(b^2+4+9)]*cosTheta

which cant be solved, unless a,b are equal where a and b are the i components of each vector. Assuming them the same,

a^2+20=sqrt[(a^2+30)(a^2+13)] * cos15

now square both sides, find a

Vectors are A=ai+4j+4k and B=ai+2J+3k)

## Answer This Question

## Related Questions

- Physics - Use the definition of scalar product( vector A* vector B = abcos theda...
- Physics - The x component of vector A is -25 m and the y component is 40m a) ...
- Physics - What are the products (either vector or scalar for each answer) of: a...
- Precalc - Given the plane 3x+2y+5z=54 and the points P0(6, 8, 4)[on plane] and ...
- physics - Vector vector A has a magnitude of 6.90 units and makes an angle of 46...
- physics - A force vector has a magnitude of 576 newtons and points at an angle ...
- physics - Any vector can be written as a unit vector multiplied by the magnitude...
- Physics(Please help) - 1) A force vector has a magnitude of 579 newtons and ...
- Physics - When two vectors vector A and vector B are drawn from a common point, ...
- physics (vector) - the resultant of two vector A and B pependicular to vector A ...

More Related Questions