Kinematics Question 443
Question: If $ \vec{a}\times \vec{b}+\vec{c}=0, $ then $ \vec{a}\times \vec{b} $ it’s
Options:
A) $ \vec{a}\times \vec{b} $
B) $ \vec{c}\times \vec{b} $
C) $ \vec{a}\times \vec{c} $
D) None of these
Correct Answer: A [a] $ \vec{a}+\vec{b}+\vec{c}=0 $ $ \therefore $ $ \vec{a}+\vec{c}=-\vec{b} $ $ \therefore $ $ (\vec{a}+\vec{c})\times \vec{b}=-\vec{b}\times \vec{b}=0 $
or $ (\vec{a}\times \vec{b})+(\vec{c}\times \vec{b})=0 $
or $ \vec{a}\times \vec{b}=\vec{b}\times \vec{c} $
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