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phys: polish math and add more examples to topic 1

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eggy 2020-09-20 15:20:32 -04:00
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docs/sph3u7.md
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@ -23,7 +23,7 @@ Every other SI unit is derived from fundamental units. Memorise these!
Every SI unit can be expanded with metric prefixes. Every SI unit can be expanded with metric prefixes.
!!! example !!! example
milli + metre = millimetre ($10^{-3}) m milli + metre = millimetre ($10^{-3}$) m
| Prefix | Abbreviation | Value | Inverse ($10^{-n}$) abbreviation | Inverse prefix | | Prefix | Abbreviation | Value | Inverse ($10^{-n}$) abbreviation | Inverse prefix |
| --- | --- | --- | --- | --- | | --- | --- | --- | --- | --- |
@ -55,6 +55,8 @@ Every SI unit can be expanded with metric prefixes.
!!! example !!! example
$$1.25 + 1.20 = 2.45$$ $$1.25 + 1.20 = 2.45$$
$$1.24 + 1.2 = 2.4$$ $$1.24 + 1.2 = 2.4$$
$$1.2 × 2 = 2$$
$$1.2 × 2.0 = 2.4$$
!!! warning !!! warning
When rounding an answer with significant figures, if the **least significant figure** is $5$, round up only if the **second-least** significant figure is odd. When rounding an answer with significant figures, if the **least significant figure** is $5$, round up only if the **second-least** significant figure is odd.