Find the sum of the vectors u and v it theta is the angle between them?
u=12, v=21, theta=70u=12,v=21,θ=70 , the answer is 27.5, 24 degrees to vv
1 Answer
May 25, 2018
If
R=sqrt(P^2+Q^2+2PQcostheta)
alpha=tan^-1((Qsin theta)/(P+Qcostheta)) , measured fromvecP
Taking
R=sqrt(21^2+12^2+2xx21xx12xxcos70^@)
=>R=27.5\ units
alpha=tan^-1((12\ sin 70^@)/(21+12\ cos70^@))
=>alpha=24.2^@