Question

The angle between the vectors ($\overset{\rightarrow}{i}$ + $\overset{\rightarrow}{j}$) and ($\overset{\rightarrow}{j}$ + $\overset{\rightarrow}{k}$) is -

• A. (a)$90^{0}$
• A. (b)$180^{0}$
• A. (c)$0^{0}$
• A. (d)$60^{0}$

Answer 1

(d)

cos q = $\frac{(\widehat{i} + \widehat{j}).(\widehat{j} + \widehat{k})}{\sqrt{2}\sqrt{2}}$

or cos q = $\frac{1}{2}$ Ž $\theta = 60^{0}$