Question 86: Motion in 2D & Vectors

Question

If $$\overrightarrow A  	imes \overrightarrow B  = \overrightarrow B  	imes \overrightarrow A $$, then the angle beetween A and B is

Accepted Answer

$$\overrightarrow A  	imes \overrightarrow B  = \overrightarrow B  	imes \overrightarrow A $$
$$\overrightarrow A  	imes \overrightarrow B  - \overrightarrow B  	imes \overrightarrow A  = 0$$
$$ \Rightarrow \overrightarrow A  	imes \overrightarrow B  + \overrightarrow A  	imes \overrightarrow B  = 0$$
$$	herefore$$ $$\overrightarrow A  	imes \overrightarrow B  = 0$$
$$ \Rightarrow AB\sin 	heta  = 0$$
$$	heta  = $$ $$0,\pi ,\,\,$$$$2\pi $$ ........
from the given options, $$	heta  = \pi $$

Answer

$${\pi  \over 2}$$

Answer

$${\pi  \over 3}$$

Answer

$$\pi $$

Answer

$${\pi  \over 4}$$

Motion in 2D & Vectors

If $\overrightarrow A \times \overrightarrow B = \overrightarrow B \times \overrightarrow A $, then the angle beetween A and B is

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