Answer: 2.5%.
- A 5%
- B 0.5%
- C 1.5%
- D 2.5%
Correct answer: D. 2.5%
Explanation: T depends on L and g each to the power 1/2, so the fractional error is halved: error in T = (1/2)(2% + 3%) = 2.5%.
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.