A vector in space has _ dimension:
Correct answer: D. 3
- A. Zero
- B. 1
- C. 2
- D. 3
Explanation
The "three" dimensions are x, y, and z. Three-dimensional space (also: 3D space, 3-space or, rarely, tri-dimensional space) is a geometric setting in which three values (called parameters) are required to determine the position of an element (i.e., point). This is the informal meaning of the term dimension.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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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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