Answer: 7%.
- A 7%
- B 6%
- C 1%
- D 3%
Correct answer: A. 7%
Explanation: Error adds as 2(1%) + 2% + 3% = 7% (the exponent multiplies the error of A).
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.