Answer: ρvL/η.
- A ρv²L/η
- B ρvL²/η
- C ρv/(Lη)
- D ρvL/η
Correct answer: D. ρvL/η
Explanation: Checking dimensions, [ρ][v][L]/[η] = [ML⁻³][LT⁻¹][L]/[ML⁻¹T⁻¹] is dimensionless, confirming Re = ρvL/η is the correct dimensionless group.
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.