which is the true of the following ? (A)Any vector $\overrightarrow{r}$ in space can be written as $(\overrightarrow{r}.\hat{i})\hat{i}+(\overrightarrow{r}.\hat{j})\hat{j}+(\overrightarrow{r}.\hat{k})\hat{k}$ (B)If $\overrightarrow{a}$ is perpendicular to $\overrightarrow{b}$ $|\overrightarrow{a}+\overrightarrow{b}|^2=|\overrightarrow{a}|^2+|\overrightarrow{b}|^2$ (C)If $|\overrightarrow{a}|=2,|\overrightarrow{b}|=1 $ and $\overrightarrow{a}.\overrightarrow{b}=1 $ ,the value of $(3\overrightarrow{a}-5\overrightarrow{b}).(2\overrightarrow{a}+7\overrightarrow{b})$ ia 1 (D) $\overrightarrow{a}=5\hat{i}-\hat{j}-3\hat{k}$ and $\overrightarrow{b}=\hat{i}+3\hat{j}-5\hat{k}$ , is the angle between $\overrightarrow{a}+\overrightarrow{b}$ and $\overrightarrow{a}-\overrightarrow{b}$ is $60\degree$ Choose the correct a nswer from the options given below:

Question

which is the true of the following ? (A)Any vector $\overrightarrow{r}$  in space can be written as  $(\overrightarrow{r}.\hat{i})\hat{i}+(\overrightarrow{r}.\hat{j})\hat{j}+(\overrightarrow{r}.\hat{k})\hat{k}$   (B)If   $\overrightarrow{a}$   is perpendicular to   $\overrightarrow{b}$ $|\overrightarrow{a}+\overrightarrow{b}|^2=|\overrightarrow{a}|^2+|\overrightarrow{b}|^2$     (C)If  $|\overrightarrow{a}|=2,|\overrightarrow{b}|=1 $  and  $\overrightarrow{a}.\overrightarrow{b}=1 $  ,the value of  $(3\overrightarrow{a}-5\overrightarrow{b}).(2\overrightarrow{a}+7\overrightarrow{b})$  ia 1 (D)  $\overrightarrow{a}=5\hat{i}-\hat{j}-3\hat{k}$  and  $\overrightarrow{b}=\hat{i}+3\hat{j}-5\hat{k}$ , is the angle between  $\overrightarrow{a}+\overrightarrow{b}$  and  $\overrightarrow{a}-\overrightarrow{b}$  is  $60\degree$ Choose the correct a nswer from the options given below:

cdquestions Admin · Accepted Answer

The correct option is (A):(A) and (B) Only

Answer

(A) and (B) Only

Answer

Answer

Answer

The Correct Option is A

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