The value of a unit vector in the direction of vector $\vec A = 5\hat i - 12\hat j$ is:

$A$ man goes $10\,m$ towards North,then $20\,m$ towards East. The displacement is ........ $m$.

The minimum number of switches in the simplified form of the following switching circuit is

What is the uncertainty in the velocity of an electron if the uncertainty in the measurement of its position is $50 \text{ pm}$? $(m_e = 9.1 \times 10^{-31} \text{ kg}, h = 6.63 \times 10^{-34} \text{ Js}, \pi = 3.142)$

Let $\overrightarrow{A} = \hat{i}A\cos\theta + \hat{j}A\sin\theta$ be any vector. Another vector $\overrightarrow{B}$ which is normal to $\overrightarrow{A}$ is

Let $\theta$ be the angle between vectors $\vec{A}$ and $\vec{B}$. Which of the following figures correctly represents the angle $\theta$?