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Quantities can be measured in:
Various units.
The dimension of a quantity:
1) Refers to?
- E.g.
2) The dimension is?
1) What is being measured.
- E.g. Length, time, mass etc.
2) Not the same as the unit in which the quantity is measured.
When measuring quantities/dimensions:
1) We (normally) use?
- E.g. Time...
1) A set of 'standard' units.
- E.g. Time is measured standardly in seconds.
There are:
1) How many SI units?
2) However, we need to know?
1) There are 7 SI units.
2) We only need to know of 6, the one we don't need to know is the Candela which is the unit for light intensity.
We don't always use standard units:
1) For some dimensions we use?
Derived units.
Derived units:
1) Are formed from?
2) They often have?
- E.g. Force?
1) The multiplication, division or raising to a power of the standard units.
2) There own symbol and units.
- E.g. Force is measured non-standardly using 'newtons', which is derived from 'F = ma' → kg m⁻²
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