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NDA 2014
Exam
NDA
Year
2014
Subject
Mathematics
Chapter
Vector Algebra

NDA 2014 · Mathematics · Vector Algebra

a + b + c = 0 such that | a | 3,| b |=5 and | c |=7 . What is...

a⃗+b⃗+c⃗=0→\vec{a}+\vec{b}+\vec{c}=\overrightarrow{0} such that ∣a⃗∣3,∣b⃗∣=5|\vec{a}| 3,|\vec{b}|=5 and ∣c⃗∣=7|\vec{c}|=7. What is cosine of the angle between b⃗\vec{b} and c⃗\vec{c} ?

Options

  1. A1112\frac{11}{12}
  2. B1314\frac{13}{14}
  3. C−1112-\frac{11}{12}
  4. D−1314-\frac{13}{14}

Correct answer

D. −1314-\frac{13}{14}

Step-by-step solution

The correct answer is option (D)
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