# Vector problem

• Oct 2nd 2008, 02:05 PM
Xerym
Vector problem
A plane flying due east at 200 km/hour encounters as a 40 km/hour north-easterly wind. The resultant velocity of the plane is the vector sum v = v1 + v2, where v1 is the velocity vector of the plane and v2 is the velocity vector of the wind. The angle between both vectors is pi/4. Determine the resultant speed of the plane (the length of v).

I don't like vectors. Maybe they don't like me either.

Dang, this whole chapters on vectors. =(

I miss integrals.
• Oct 2nd 2008, 02:59 PM
skeeter
law of cosines will get it quickly ...

$v = \sqrt{v_1^2 + v_2^2 - 2v_1v_2\cos\left(\frac{\pi}{4}\right)}$
• Oct 2nd 2008, 04:10 PM
cheet0face
For the first part under the square root, does that mean the exponent of v2 divided by the exponent of v1?
• Oct 2nd 2008, 04:21 PM
skeeter
it means $v_1$ squared + $v_2$ squared