Which of the following is not a vector quantity?
Correct answer: A. Density
- A. Density
- B. Displacement
- C. Electric field intensity
- D. Angular momentum
Explanation
Density is a scalar quantity because it is defined as the mass per unit volume and only has a magnitude, not a direction. Both mass and volume are scalar quantities, and when you divide a scalar quantity (mass) by another scalar quantity (volume), the result is also a scalar.
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About Vectors and Equilibrium
Vectors have magnitude and direction, unlike scalars, and are combined by head-to-tail or parallelogram methods. Work covers rectangular components, equilibrium when the resultant force is zero, the scalar product for work and projections, and the vector product for torque and cross-product direction using the right-hand rule.
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