If θ is the angle between two vectors \(\vec{a}\) and \(\vec{b}\), then \(\vec{a} \cdot \vec{b}\) ≥ 0 only when :
A. 0 < θ < \(\frac{\pi}{2}\)
B. 0 ≤ θ ≤ \(\frac{\pi}{2}\)
C. 0 < θ < π
D. 0 ≤ θ ≤ π
Answer:B
If θ is the angle between two vectors \(\vec{a}\) and \(\vec{b}\), then \(\vec{a} \cdot \vec{b}\) ≥ 0 only when :
A. 0 < θ < \(\frac{\pi}{2}\) B. 0 ≤ θ ≤ \(\frac{\pi}{2}\) C. 0 < θ < π D. 0 ≤ θ ≤ π