Converting derived units.

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Presentation transcript:

Converting derived units. Conversions II Converting derived units.

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

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

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

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

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.

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

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

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