Answer: 11%.
- A 7%
- B 8%
- C 11%
- D 13%
Correct answer: C. 11%
Explanation: By the power rule for combination of errors, ΔZ/Z = 2(ΔA/A) + 3(ΔB/B) + 1(ΔC/C) = 2(1%) + 3(2%) + 1(3%) = 2% + 6% + 3% = 11%. Errors in the denominator's quantity still add, since this gives the worst-case (maximum possible) error.
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.