Gujarati
3-1.Vectors
normal

सदिशों $\mathop A\limits^ \to = 3\hat i + 4\hat j + 5\hat k$ तथा $\mathop B\limits^ \to = 3\hat i + 4\hat j + 5\hat k$ के बीच का कोण....... $^o$ होगा

A

$60$

B

$0$

C

$90$

D

उपरोक्त में से कोई नहीं

Solution

(d) $\cos \theta = \frac{{\mathop A\limits^ \to .\mathop B\limits^ \to }}{{|A||B|}} = \frac{{9 + 16 + 25}}{{\sqrt {9 + 16 + 25} \sqrt {9 + 16 + 25} }}$

$=\frac{{50}}{{50}} = 1 \rightarrow \cos \theta = 1$

$⇒$ $\theta = {\cos ^{ – 1}}(1)$

Standard 11
Physics

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