Scalar Quantity - Definition and Examples

Scalar quantities are physical quantities that can be described by their magnitude only and do not have any direction associated with them. They are represented by a single number or value. Examples of scalar quantities include distance, speed, temperature, mass, energy, and power. Scalar quantities are important in physics and engineering because they help describe the behavior of the physical world.

Explanation:

The given options are Weight, Impulse, Power, and Acceleration. Let's discuss each of them one by one.

Weight:
Weight is the force exerted on an object due to gravity. It is a vector quantity as it has both magnitude and direction. The direction of weight is always towards the center of the earth. Therefore, weight cannot be considered a scalar quantity.

Impulse:
Impulse is the change in momentum of an object when a force is applied to it for a specific time interval. It is a vector quantity as it has both magnitude and direction. The direction of impulse is the same as the direction of the force applied. Therefore, impulse cannot be considered a scalar quantity.

Power:
Power is the rate at which work is done or energy is transferred. It is a scalar quantity as it has only magnitude and no direction associated with it. The unit of power is watt (W), which is defined as joules per second (J/s). Therefore, power is a scalar quantity.

Acceleration:
Acceleration is the rate of change of velocity of an object with respect to time. It is a vector quantity as it has both magnitude and direction. The direction of acceleration is the same as the direction of the change in velocity. Therefore, acceleration cannot be considered a scalar quantity.

Conclusion:

From the above discussion, we can conclude that Power is a scalar quantity as it has only magnitude and no direction associated with it. Therefore, option 'C' is the correct answer.