Question

Q1) rewrite the following quantities using suitable prefixes:
a)485 000 N
b)0.000 007 m

Q2) rewrite the following measurements in the units suggested:
a)760 mm in m
b)4.5 hour in s
c)3.2 x 10³ m in km
d)10⁻¹ cm in mm
e)7.2 km in mm
f)2.5 ms in µ (hours)

Answer 1

Answer:

Q1.

1.485×10^3 N

2.7×10^-5 m

Q2.

1. 0.76m

2. 270sec

3. 3.2 km

4. 1mm

5. 7.2×10^-12mm

6.sorry dont know

Answer 2

(1) The given quantities can be written with the following prefixes.

• The prefix 'kilo' (k) can be used when the value given is a multiple of 1000.
• So, 485000 N can be written as 485 kN.
• The prefix 'mu' (μ) can be used when the value given is a multiple of 10⁻⁶.
• So, 0.000007 m can be written as 7 μm.

(2) The given measurements can be converted into the units suggested as follows.

• One metre (m) is equal to 1000 millimetre (mm). So, 760 mm would be equal to,

        $\frac{760}{1000} = 0.76 m$

• One hour is equal to 3600 seconds (s). So, 4.5 hours would be equal to,

        $4.5 * 3600 = 16,200 s$

• One kilometre (km) is equal to 1000 metre (m). So, 3.2×10³ m would be equal to,

        $\frac{3.2 * 10^{3}}{1000} = 3.2 km$

• One centimetre (cm) is equal to 10 millimetre (mm). So, 10⁻¹ cm would be equal to,

        $10^{-1} * 10 = 1 mm$

• One kilometre (km) is equal to 10⁶ millimetre (mm). So, 7.2 km would be equal to,

        $7.2 * 10^{6} = 7200000 mm$

• One hour is equal to 3.6×10⁵ milliseconds (ms). So, 2.5 ms would be equal to,

        $\frac {2.5} {3.6 * 10^{5}} = 0.69*10^{-5} hours$