1. Converting derived units.
Conversions II
Converting derived units.

2. Conversion Factors 1 kilo = 1000 (base unit)
1 (base unit) = 1000 milli
1 (base unit) = 100 centi
1 year = 365 days
1 day = 24 hrs
1 hr = 60 min
1 min = 60 sec

3. Revisit Show all work! No naked numbers! UNITS, UNITS, UNITS
Treat numbers as fractions
Multiply across
3 sig figs

4. 5.61 E-1 kg 103 Problem: Convert 561 g into kilograms 561 g 1 kg
kilo = 1000 or 103 = 1
103 g
103

5. 2.50 E-2 Problem: Convert 90 s to hrs 60 hrs 90 s 1 min 1 hrs 90 hrs =
60 x 60
2.50 E-2
hrs

6. Convert either km to m or hr to minutes first.
Problem: Convert 45 km/hr to m/min
45 km
103 m
1 hr
45000 m =
1 hr 1 km
60 min
60 min
7.50 E2
m/min
Convert either km to m or hr to minutes first.

7. 4.42 E8 Problem: Convert 14 yrs to s 1 s 14 yrs 365 days 24 hrs 60 min
4.42 E8 s
4.42 E8 = s 1

8. 3.89 m/s Problem: Convert 14 km/hr to m/s 1 14 km 103 m 1 hr 1 min=
1 hr 1 km
60 min
60 s
3600 s
3.89
m/s

9. Conversions – all into m/s.
34 km/hr
1200 cm/s
3,000 km/hr
67 km/day
390,096 m/year