Thursday

January 29, 2015

January 29, 2015

Posted by **Tom** on Saturday, September 30, 2006 at 4:44pm.

a)I got (27m)i +(10m)j but the book said it should have been (-9m)i +(10m)j

b)what is the magnitude and direction of vector a + vector b (relative to i)?

to find the magnitude i did the sqrt((-9^2 + 10^2) and then I got 13.453

I wasn't sure how to find the direction.

I am wondering how you got 27i? The i component of a was 4, and the i component of b was -13. Adding them gets the book answer.

Magnitude of the sum: (-13)^2 + (10)^2= 269, and the square of that is ....

Direction: arctan (10/-13)

jytttttttttttttttttttttttmhg

**Answer this Question**

**Related Questions**

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

Physics - The two vectors a and b have equal magnitudes(on an x-y plane vector a...

physics - if vector a is fixed but vector b can be rotated in any direction. ...

Physics - Use the definition of scalar product( vector A* vector B = abcos theda...

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...

Physics - An electron's position is given by r = 2.00t i - 7.00t2 j + 5.00 k, ...

Physics - The three vectors have magnitude a =3m, b= 4m and c=10m . On the x ...

Physics - When two vectors vector A and vector B are drawn from a common point, ...

Physics - Three vectors, each have a magnitude of 30 units, have their tails at ...