Answer: newton, expressed as kg·m·s⁻².
- A newton, expressed as kg·m·s⁻²
- B watt, expressed as joule per second
- C pascal, expressed as newton per square metre
- D volt, expressed as joule per coulomb
Correct answer: A. newton, expressed as kg·m·s⁻²
Explanation: The newton expressed as kg·m·s⁻² is written purely in terms of the SI base units of mass, length, and time, whereas the other options express one derived unit in terms of other derived units.
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.