Kinematics Question 571
Question: If a unit vector is represented by $ 0.5\widehat{i}+0.8\widehat{j}+c\widehat{k}, $ then the value of c is
Options:
A) 1
B)$ \sqrt{0.8} $
C) $ \sqrt{0.11} $
D)$ \sqrt{0.01} $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ \sqrt{{{0.5}^{2}}+{{0.8}^{2}}+c^{2}}=1 $ or$ c=\sqrt{1-0.89}=\sqrt{0.11} $
