E.1: Write down the SI unit for the each of the following quantities:
A. length

B. time
C. mass
D. quantity of matter

Hướng dẫn

length (m); time (s); mass (kg); quantity of matter (mol)

E.2: For each of the following units, write down the symbol and what power of 10 it represents:
A. millimetre
B. centimetre
C. metre

D. kilometre

Hướng dẫn

millimetre (mm) = 10^-3m
centimetre (cm) = 10^-2m
metre (m) = 10^o m
kilometre (km) = 10³m

E.3: For each of the following symbols, write out the unit in full and write what power of 10 it
represents:
A. µg
B. mg
C. kg
D. Mg

Hướng dẫn

µg = 10^-6g; mg = 10^-3g; kg = 10³g; Mg = 10⁶g

E.4: Write each of the following in scientific notation, correct to 2 decimal places:
A. 0,00000123 N
B. 417 000 000 kg
C. 246800 A
D. 0,00088 mm

Hướng dẫn

0,00000123 N = 1,23.10^-6N
417 000 000 kg = 4,17.10⁸kg
246800A = 2,46.10⁵A
0,00088mm = 0,88.10^-3mm

E.5: Rewrite each of the following, using the correct prefix uisng 2 decimal places where applicable:
A. 0,00000123 N
B. 417 000 000 kg
C. 246800 A
D. 0,00088 mm

Hướng dẫn

0,00000123 N = 1,23.10^-6N = 1,23µN
0,00088mm = 0,88.10^-3mm = 0,88.10^-6m = 0,88µm

E.6: For each of the following, write the measurement using the correct symbol for the prefix and the base unit:
A. 1,01 microseconds
B. 1 000 milligrams
C. 7,2 megameters
D. 11 nanolitre

Hướng dẫn

1,01 microseconds = 1,01µs;
1 000 milligrams = 1 000mg;
7,2 megameters = 7,2Mm
11 nanolitre = 11nm

E.7: The Concorde is a type of aeroplane that flies very fast. The top speed of the Concorde is 844 km·h$^{−1}$. Convert the Concorde’s top speed to m·s$^{−1}$.

Hướng dẫn

844 km·h$^{−1}$ = 3038.4m∙s^-1

E.8: The boiling point of water is 100^oC. What is the boiling point of water in kelvin?

Hướng dẫn

100^oC = 373K

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Grade 10 - Physics - Units

High School Students Studying the Sciences Physics