Saturday

January 31, 2015

January 31, 2015

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.

**Answer this Question**

**Related Questions**

Physics - The x component of vector A is -25 m and the y component is 40m a) ...

Calculus - SORRY, i wrote this question wrong before ... u, v, w are UNIT ...

Calculus - hah im trully very SORRY, ok now i double checked.. so everything ...

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

physics - (a) An object is subjected to two displacements. The displacement ...

Calculus and vectors - |C|=5 and |D|=8. The angle formed by vectors C and D is ...

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

Physics - For the three vectors A+B+C= -1.4i. Vector A is 4i and vector C is -...

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

physics - A vector has components Ax = 44 m and Ay = 30 m. Find the length of ...