Define scalar and vector physical quantities with their examples.
Scalar physical quantity : "The physical quantity which needs only magnitude to describe it is called a scalar physical quantity."
E.g. : Mass, distance, time, density, temperature, power etc.
Vector physical quantity: "The physical quantity which needs magnitude and direction both to describe it is called a vector physical quantity."
E.g. : Displacement, velocity, acceleration, force etc.
Pick out the two scalar quantities in the following list :
force, angular momentum, work, current, linear momentum, electric field, average velocity, magnetic moment, relative velocity.
The change in a vector may occur due to .....
The value of a unit vector in the direction of vector $A = 5\hat i - 12\hat j,$ is
A particle is moving with speed $6\,m/s$ along the direction of $\vec A = 2\hat i + 2\hat j - \hat k,$ then its velocity is