An example of scalar quantity is _________?
Correct answer: B. Speed
- A. Displacement
- B. Speed
- C. Velocity
- D. Acceleration
Explanation
Speed is a scalar because it has magnitude only, whereas displacement, velocity and acceleration also require direction and are vectors. The likely mistake is choosing velocity because speed and velocity are related, although velocity includes direction.
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About Scalar Product
The scalar product of two vectors is A dot B equals AB cos theta, producing a scalar determined by their magnitudes and included angle. Applications include work done and projection of one vector on another, with perpendicular vectors giving zero and the scalar product distinguished from the vector product.
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