Unit 8 Answers to extra practice conversion ws

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Unit Analysis Practice

You must show all of your work. Your answer should be reported to the correct number of sig figs.

G _ _ M _ _ k h da b d c m _ _

μ

_ _ n

1) Convert 62 km to centimeters

62 km ( 100000cm) = 6200000 cm

( 1 km)

2) Convert 198.50 micrograms to dekagrams

198.50

μ g ( 1 dag ) = .000019850 dag

( 10000000

μ g )

3) Convert 15.00 ft to meters

15.00 ft ( 12 in) ( 2.54 cm ) ( 1 m ) = 4.572 m

( 1 ft) ( 1 in ) ( 100 cm)

4) 5.00 meters to inches (you should have a hint memorized!!)

5.00 m ( 100 cm) ( 1 in ) = 196.85039 in = 197 in

( 1 m ) ( 2.54 cm)

5) Change 64 hours to seconds

64 hr ( 60 min) ( 60 sec) = 230400 sec = 230000sec

( 1 hr ) ( 1 min)

6) Change 1,314,000 minutes to years

1314000 min ( 1 hr ) ( 1 Day ) ( 1 week) ( 1 year ) = 2.50686 yr = 2.507 yr

( 60 min) (24 hr) ( 7 Days) ( 52 weeks)

7) Convert 3.0 liters to quarts (hints: 1 gallon = 4 qts, 1 liter = 1.0567 qts)

3.0 liters ( 1.0567 qts) = 3.1701 qts = 3.2 qts

( 1 liter)

8) Change $8.25 / hour to dollars per year

9) Change 220 feet per second to miles per hour (hint: 1 mile = 5280 ft)

10) Suppose you plan to visit Mammoth Caves in Kentucky. You want to take the three-mile walking tour. At home you pace yourself and find out that you stroll 90 feet per minute. Use unit analysis to determine how many hours it will take you to walk the 3 miles. (hint: 1 mile = 5280 ft)

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