Friday

November 21, 2014

November 21, 2014

Posted by **Cathy** on Sunday, June 23, 2013 at 6:19am.

- Physics -
**MathMate**, Sunday, June 23, 2013 at 6:35amA=[5,-6.5]

B=[-3.5,7]

If A is perpendicular to C, then A.C=0, or

C=[6.5k, 5k]

(verify that A.C=0)

If in addition, C.B=15, we have

C.B=[6.5k,5k].[-3.5,7]

=35k-22.75k

=12.25k

But C.B=15, therefore 12.25k=15, =>

k=15/12.25=60/49

Therefore

C=[6.5k,5k]

=[390/49, 300/49]

Check my arithmetic and that the given conditions are satisfied.

- Physics -
**Cathy**, Sunday, June 23, 2013 at 7:41amthanks

- Physics :) -
**MathMate**, Sunday, June 23, 2013 at 8:14amyou're welcome!

- Physics -
**Charles**, Saturday, August 30, 2014 at 6:14pmI don't understand the flow in the math here. Please help me understand this solution by "dumbing it down" a bit.

**Answer this Question**

**Related Questions**

physics [vectors] - The concept i get, but somehow i just can't execute this ...

Physics - You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third ...

maths - Given that vector c and vector d are non zero vectors such that vector c...

Applied Maths - Given that position vector a=4i+2j, position vector b=13i+5j are...

physics - Suppose vector A=3i-2j, B= -i-4j and vector C are three vectors in xy ...

Math - vectors - In the product F(vector)=q(V(vector)xB(vector), take q = 4, V(...

Physics - You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third ...

cartesian vectors 2 - let vector U = (vector u1, vector u2) vector V = (vector ...

Physics - Let vector A = 4i^ + 4j^, vector B = -2i^ - 5j^, and vector F = vector...

Physics - Let vector A = 4i^ + 4j^, vector B = -2i^ - 5j^, and vector F = vector...