Thursday
July 24, 2014

Homework Help: sciecne

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

In unit-vector notation, what is teh sum of vector a =(4m)i + (3m)j and vector b= (-13m)i +(7m)j?

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

First Name:
School Subject:
Answer:

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 ...

Search
Members