Answer: 5%.
- A 5%
- B 3%
- C 2%
- D 1%
Correct answer: A. 5%
Explanation: Density = mass/(side)³, so the relative error adds as 2% + 3×1% = 5%, since the error in a cubed quantity is tripled.
The 7 SI base units. All derived units (newton, joule, watt, volt, etc.) can be expressed as combinations of these 7 fundamental units raised to various powers.
Concept context
SI base units, dimensional analysis, significant figures, and error propagation. The toolkit every physics calculation relies on.