TS EAMCET · Physics · Mathematics in Physics
If \(0.5 \hat{\mathbf{i}}+0.8 \hat{\mathbf{j}}+c \hat{\mathbf{k}}\) is a unit vector, then \(c\) is
- A \(\sqrt{0.89}\)
- B 0.2
- C 0.3
- D \(\sqrt{0.11}\)
Answer & Solution
Correct Answer
(D) \(\sqrt{0.11}\)
Step-by-step Solution
Detailed explanation
\(\begin{array}{r}\text { Given, unit vector is } 0.5 \hat{\mathbf{i}}+0.8 \hat{\mathbf{j}}+c \hat{\mathbf{k}} \\ =\frac{1}{2} \hat{\mathbf{i}}+\frac{4}{5} \hat{\mathbf{j}}+c \hat{\mathbf{k}}\end{array}\)…
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