Kinematics Question 137
Question: A vector is represented by $ 3\hat{i}+\hat{j}+2\hat{k} $ . it’s length in XY plane is [EAMCET (Engg.) 1994]
Options:
A) 2
B) $ \sqrt{14} $
C) $ \sqrt{10} $
D) $ \sqrt{5} $
Show Answer
Answer:
Correct Answer: C
Solution:
$ \vec{R}=3\hat{i}+\hat{j}+2\hat{k} $
Length in XY plane = $ \sqrt{R_x^{2}+R_y^{2}}=\sqrt{3^{2}+1^{2}} $
$ =\sqrt{10} $
BETA
