Kinematics Question 18
Question: If vectors P, Q and R have magnitude 5, 12 and 13 unit and $ \overrightarrow{P}+\overrightarrow{Q}=\overrightarrow{R}, $ the angle between Q and R it’s [CEET 1998]
Options:
A) $ {{\cos }^{-1}}\frac{5}{12} $
B) $ {{\cos }^{-1}}\frac{5}{13} $
C) $ {{\cos }^{-1}}\frac{12}{13} $
D) $ {{\cos }^{-1}}\frac{7}{13} $
Correct Answer: C $ |\vec{P}|\ =\ 5 $ , $ |\vec{Q}|\ =12 $ and $ |\vec{R}|\ =13 $ $ \cos \theta =\frac{Q}{R}=\frac{12}{13} $ $ \theta ={{\cos }^{-1}}( \frac{12}{13} ) $
Show Answer
Answer:
Solution:
