Kinematics Question 284

Question: A vector $ \overrightarrow{A} $ points vertically upward and $ \overrightarrow{B} $ points towards north. The vector product $ \overrightarrow{A}\times \overrightarrow{B} $ it’s [UPSEAT 2000]

Options:

A) Zero

B) Along west

C) Along east

D) Vertically downward

Show Answer

Answer:

Correct Answer: B

Solution:

Direction of vector a is along z-axis $ \vec{A}=a\hat{k} $

Direction of vector b is towards north $ \vec{B}=b\hat{j} $

Now $ \vec{A}\times \vec{B}=a\hat{k}\times b\hat{j}=ab(-\hat{j}) $

The direction is $ \vec{A}\times \vec{B} $ it’s along west.



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