A technician needs to measure the weight of a metal coupling. The coupling has a mass of 0.68 kg and the gravitational field strength is 9.8 N kg−19.8\ \mathrm{N\,kg^{-1}}9.8 Nkg−1.
Two newtonmeters are available.
| Newtonmeter | Range / N\mathrm{N}N | Resolution / N\mathrm{N}N |
|---|---|---|
| A | 0 to 5 | 0.1 |
| B | 0 to 10 | 0.2 |
A student chooses newtonmeter A because it has the finer resolution.
Calculate the expected weight of the coupling.
Evaluate the student's choice of newtonmeter.