A scalar is a quantity that has no direction.
Examples include:
-- cost
-- temperature
-- speed
-- energy
-- work
-- mass
-- weight
-- volume
-- density
-- duration
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A scalar quantity is a physical quantity that has magnitude but no direction. Examples include mass, temperature, and speed. Scalars are added or subtracted by simple arithmetic operations.
No, mass is not a scalar quantity. It is a scalar quantity. Scalars have only magnitude and no direction.
No, mass and energy are not scalars. Mass is a scalar quantity while energy is a scalar quantity.
Yes, you can add a scalar to a vector by adding the scalar value to each component of the vector.
Inertia is a scalar quantity. It is a measure of an object's resistance to changes in its state of motion and is directly proportional to its mass. Inertia does not have a direction associated with it, so it is considered a scalar.
Average speed is a scalar quantity because it only has magnitude and does not have a specific direction associated with it.