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Which of the following is the best way to express the dimensions of a
rectangular laboratory bench (i.e. a large desk surface)?
A 1.04m x 400 cm
B
1.04m x 4.00 m
C
104 cm x 4.00 m
D
1040 mm x 4000 mm
The surface area of the laboratory bench in question 2 above is
4.16 square metres. Explain why this area is called a derived quantity.
Why do you think the platinum-iridium metre standard was
abandoned and a new definition adopted for the metre?
How was the second defined before the atomic (caesium) clock was
developed?
The following four S.I. units were named after famous scientists:
watt joule pascal kelvin
(i) Find out
(a) the area of physics to which each of these scientists made a
significant contribution:
(b) the type of quantity measured using each of the four units.
(ii) Write down, using figures and unit abbreviations: six thousand
watts; four hundred pascals.
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