Kinematics Question 144
Question: If a unit vector is represented by $ 0.5\hat{i}+0.8\hat{j}+c\hat{k} $ , then the value of c is [CBSE PMT 1999; EAMCET 1994]
Options:
A) 1
B) $ \sqrt{0.11} $
C) $ \sqrt{0.01} $
D) $ \sqrt{0.39} $
Correct Answer: B Magnitude of unit vector = 1 By solving we get $ c=\sqrt{0.11} $
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Answer:
Solution:
therefore $ \sqrt{{{(0.5)}^{2}}+{{(0.8)}^{2}}+c^{2}}=1 $
