Friday

April 18, 2014

April 18, 2014

Posted by **Melinda** on Monday, March 26, 2012 at 1:24am.

Here is the image for triangle:

imgur dot com/OZAwV

please help, I have a test tomorrow~

- Calculus -
**Reiny**, Monday, March 26, 2012 at 9:21amSince you are dealing with the magnitude of the vectors, we can use basic geometry.

Using the cosines law on the first triangle ...

(2A)^2 = 5^2 + 8^2 - 2(5)(8)cos 35°

= 89 - 65.53216...

= 23.4678...

2A = √23.4678.. = 4.84436...

A = √23.4678.. /2 = 2.42218... (store in calculator's memory)

At this point there is a contradiction in your information

Using the sine law we can now find the angle formed between vectors 2A and C, and that makes the angle between A and C appr. 71° , not 40° like you said.

Anyway, we found the magnitude of vector 2A to be appr. 4.844

Once you find the typo, you can proceed from there.

**Related Questions**

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

science(physics) - vector a+ vector b= 2i Vector a+ vector b=4j Then the angle ...

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...

maths vector - if a vector+ b vector+ c vector =0, & a vector=3, b=5, c=9, find ...

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

College Physics - Vector Algebra let A vector=6ihat+3jhat, B vector= -3ihat-...

Calculus - u, v, w are UNIT VECTORS. the angle between vector v and w is 35 ...

physics - Vector vector A has a magnitude of 6.90 units and makes an angle of 46...

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